sqlparser_postgres.rs

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#![warn(clippy::all)]
//! Test SQL syntax specific to PostgreSQL. The parser based on the
//! generic dialect is also tested (on the inputs it can handle).

#[macro_use]
mod test_utils;
use test_utils::*;

use sqlparser::ast::*;
use sqlparser::dialect::{GenericDialect, PostgreSqlDialect};
use sqlparser::parser::ParserError;

#[test]
fn parse_create_table_with_defaults() {
    let sql = "CREATE TABLE public.customer (
            customer_id integer DEFAULT nextval(public.customer_customer_id_seq),
            store_id smallint NOT NULL,
            first_name character varying(45) NOT NULL,
            last_name character varying(45) COLLATE \"es_ES\" NOT NULL,
            email character varying(50),
            address_id smallint NOT NULL,
            activebool boolean DEFAULT true NOT NULL,
            create_date date DEFAULT now()::text NOT NULL,
            last_update timestamp without time zone DEFAULT now() NOT NULL,
            active integer NOT NULL
    ) WITH (fillfactor = 20, user_catalog_table = true, autovacuum_vacuum_threshold = 100)";
    match pg_and_generic().one_statement_parses_to(sql, "") {
        Statement::CreateTable {
            name,
            columns,
            constraints,
            with_options,
            if_not_exists: false,
            external: false,
            file_format: None,
            location: None,
            ..
        } => {
            assert_eq!("public.customer", name.to_string());
            assert_eq!(
                columns,
                vec![
                    ColumnDef {
                        name: "customer_id".into(),
                        data_type: DataType::Int(None),
                        collation: None,
                        options: vec![ColumnOptionDef {
                            name: None,
                            option: ColumnOption::Default(
                                pg().verified_expr("nextval(public.customer_customer_id_seq)")
                            )
                        }],
                    },
                    ColumnDef {
                        name: "store_id".into(),
                        data_type: DataType::SmallInt(None),
                        collation: None,
                        options: vec![ColumnOptionDef {
                            name: None,
                            option: ColumnOption::NotNull,
                        }],
                    },
                    ColumnDef {
                        name: "first_name".into(),
                        data_type: DataType::Varchar(Some(45)),
                        collation: None,
                        options: vec![ColumnOptionDef {
                            name: None,
                            option: ColumnOption::NotNull,
                        }],
                    },
                    ColumnDef {
                        name: "last_name".into(),
                        data_type: DataType::Varchar(Some(45)),
                        collation: Some(ObjectName(vec![Ident::with_quote('"', "es_ES")])),
                        options: vec![ColumnOptionDef {
                            name: None,
                            option: ColumnOption::NotNull,
                        }],
                    },
                    ColumnDef {
                        name: "email".into(),
                        data_type: DataType::Varchar(Some(50)),
                        collation: None,
                        options: vec![],
                    },
                    ColumnDef {
                        name: "address_id".into(),
                        data_type: DataType::SmallInt(None),
                        collation: None,
                        options: vec![ColumnOptionDef {
                            name: None,
                            option: ColumnOption::NotNull
                        }],
                    },
                    ColumnDef {
                        name: "activebool".into(),
                        data_type: DataType::Boolean,
                        collation: None,
                        options: vec![
                            ColumnOptionDef {
                                name: None,
                                option: ColumnOption::Default(Expr::Value(Value::Boolean(true))),
                            },
                            ColumnOptionDef {
                                name: None,
                                option: ColumnOption::NotNull,
                            }
                        ],
                    },
                    ColumnDef {
                        name: "create_date".into(),
                        data_type: DataType::Date,
                        collation: None,
                        options: vec![
                            ColumnOptionDef {
                                name: None,
                                option: ColumnOption::Default(
                                    pg().verified_expr("CAST(now() AS TEXT)")
                                )
                            },
                            ColumnOptionDef {
                                name: None,
                                option: ColumnOption::NotNull,
                            }
                        ],
                    },
                    ColumnDef {
                        name: "last_update".into(),
                        data_type: DataType::Timestamp,
                        collation: None,
                        options: vec![
                            ColumnOptionDef {
                                name: None,
                                option: ColumnOption::Default(pg().verified_expr("now()")),
                            },
                            ColumnOptionDef {
                                name: None,
                                option: ColumnOption::NotNull,
                            }
                        ],
                    },
                    ColumnDef {
                        name: "active".into(),
                        data_type: DataType::Int(None),
                        collation: None,
                        options: vec![ColumnOptionDef {
                            name: None,
                            option: ColumnOption::NotNull
                        }],
                    },
                ]
            );
            assert!(constraints.is_empty());
            assert_eq!(
                with_options,
                vec![
                    SqlOption {
                        name: "fillfactor".into(),
                        value: number("20")
                    },
                    SqlOption {
                        name: "user_catalog_table".into(),
                        value: Value::Boolean(true)
                    },
                    SqlOption {
                        name: "autovacuum_vacuum_threshold".into(),
                        value: number("100")
                    },
                ]
            );
        }
        _ => unreachable!(),
    }
}

#[test]
fn parse_create_table_from_pg_dump() {
    let sql = "CREATE TABLE public.customer (
            customer_id integer DEFAULT nextval('public.customer_customer_id_seq'::regclass) NOT NULL,
            store_id smallint NOT NULL,
            first_name character varying(45) NOT NULL,
            last_name character varying(45) NOT NULL,
            info text[],
            address_id smallint NOT NULL,
            activebool boolean DEFAULT true NOT NULL,
            create_date date DEFAULT now()::DATE NOT NULL,
            create_date1 date DEFAULT 'now'::TEXT::date NOT NULL,
            last_update timestamp without time zone DEFAULT now(),
            release_year public.year,
            active integer
        )";
    pg().one_statement_parses_to(sql, "CREATE TABLE public.customer (\
            customer_id INT DEFAULT nextval(CAST('public.customer_customer_id_seq' AS REGCLASS)) NOT NULL, \
            store_id SMALLINT NOT NULL, \
            first_name CHARACTER VARYING(45) NOT NULL, \
            last_name CHARACTER VARYING(45) NOT NULL, \
            info TEXT[], \
            address_id SMALLINT NOT NULL, \
            activebool BOOLEAN DEFAULT true NOT NULL, \
            create_date DATE DEFAULT CAST(now() AS DATE) NOT NULL, \
            create_date1 DATE DEFAULT CAST(CAST('now' AS TEXT) AS DATE) NOT NULL, \
            last_update TIMESTAMP DEFAULT now(), \
            release_year public.year, \
            active INT\
        )");
}

#[test]
fn parse_create_table_with_inherit() {
    let sql = "\
               CREATE TABLE bazaar.settings (\
               settings_id UUID PRIMARY KEY DEFAULT uuid_generate_v4() NOT NULL, \
               user_id UUID UNIQUE, \
               value TEXT[], \
               use_metric BOOLEAN DEFAULT true\
               )";
    pg().verified_stmt(sql);
}

#[test]
fn parse_create_table_empty() {
    // Zero-column tables are weird, but supported by at least PostgreSQL.
    // <https://github.com/sqlparser-rs/sqlparser-rs/pull/94>
    let _ = pg_and_generic().verified_stmt("CREATE TABLE t ()");
}

#[test]
fn parse_create_table_constraints_only() {
    // Zero-column tables can also have constraints in PostgreSQL
    let sql = "CREATE TABLE t (CONSTRAINT positive CHECK (2 > 1))";
    let ast = pg_and_generic().verified_stmt(sql);
    match ast {
        Statement::CreateTable {
            name,
            columns,
            constraints,
            ..
        } => {
            assert_eq!("t", name.to_string());
            assert!(columns.is_empty());
            assert_eq!(
                only(constraints).to_string(),
                "CONSTRAINT positive CHECK (2 > 1)"
            );
        }
        _ => unreachable!(),
    };
}

#[test]
fn parse_alter_table_constraints_rename() {
    match pg().verified_stmt("ALTER TABLE tab RENAME CONSTRAINT old_name TO new_name") {
        Statement::AlterTable {
            name,
            operation: AlterTableOperation::RenameConstraint { old_name, new_name },
        } => {
            assert_eq!("tab", name.to_string());
            assert_eq!(old_name.to_string(), "old_name");
            assert_eq!(new_name.to_string(), "new_name");
        }
        _ => unreachable!(),
    }
}

#[test]
fn parse_alter_table_alter_column() {
    pg().one_statement_parses_to(
        "ALTER TABLE tab ALTER COLUMN is_active TYPE TEXT USING 'text'",
        "ALTER TABLE tab ALTER COLUMN is_active SET DATA TYPE TEXT USING 'text'",
    );

    match pg()
        .verified_stmt("ALTER TABLE tab ALTER COLUMN is_active SET DATA TYPE TEXT USING 'text'")
    {
        Statement::AlterTable {
            name,
            operation: AlterTableOperation::AlterColumn { column_name, op },
        } => {
            assert_eq!("tab", name.to_string());
            assert_eq!("is_active", column_name.to_string());
            let using_expr = Expr::Value(Value::SingleQuotedString("text".to_string()));
            assert_eq!(
                op,
                AlterColumnOperation::SetDataType {
                    data_type: DataType::Text,
                    using: Some(using_expr),
                }
            );
        }
        _ => unreachable!(),
    }
}

#[test]
fn parse_create_table_if_not_exists() {
    let sql = "CREATE TABLE IF NOT EXISTS uk_cities ()";
    let ast = pg_and_generic().verified_stmt(sql);
    match ast {
        Statement::CreateTable {
            name,
            if_not_exists: true,
            ..
        } => {
            assert_eq!("uk_cities", name.to_string());
        }
        _ => unreachable!(),
    }
}

#[test]
fn parse_bad_if_not_exists() {
    let res = pg().parse_sql_statements("CREATE TABLE NOT EXISTS uk_cities ()");
    assert_eq!(
        ParserError::ParserError("Expected end of statement, found: EXISTS".to_string()),
        res.unwrap_err()
    );

    let res = pg().parse_sql_statements("CREATE TABLE IF EXISTS uk_cities ()");
    assert_eq!(
        ParserError::ParserError("Expected end of statement, found: EXISTS".to_string()),
        res.unwrap_err()
    );

    let res = pg().parse_sql_statements("CREATE TABLE IF uk_cities ()");
    assert_eq!(
        ParserError::ParserError("Expected end of statement, found: uk_cities".to_string()),
        res.unwrap_err()
    );

    let res = pg().parse_sql_statements("CREATE TABLE IF NOT uk_cities ()");
    assert_eq!(
        ParserError::ParserError("Expected end of statement, found: NOT".to_string()),
        res.unwrap_err()
    );
}

#[test]
fn parse_create_schema_if_not_exists() {
    let sql = "CREATE SCHEMA IF NOT EXISTS schema_name";
    let ast = pg_and_generic().verified_stmt(sql);
    match ast {
        Statement::CreateSchema {
            if_not_exists: true,
            schema_name,
        } => assert_eq!("schema_name", schema_name.to_string()),
        _ => unreachable!(),
    }
}

#[test]
fn parse_drop_schema_if_exists() {
    let sql = "DROP SCHEMA IF EXISTS schema_name";
    let ast = pg().verified_stmt(sql);
    match ast {
        Statement::Drop {
            object_type,
            if_exists: true,
            ..
        } => assert_eq!(object_type, ObjectType::Schema),
        _ => unreachable!(),
    }
}

#[test]
fn parse_copy_from_stdin() {
    let sql = r#"COPY public.actor (actor_id, first_name, last_name, last_update, value) FROM stdin;
1	PENELOPE	GUINESS	2006-02-15 09:34:33 0.11111
2	NICK	WAHLBERG	2006-02-15 09:34:33 0.22222
3	ED	CHASE	2006-02-15 09:34:33 0.312323
4	JENNIFER	DAVIS	2006-02-15 09:34:33 0.3232
5	JOHNNY	LOLLOBRIGIDA	2006-02-15 09:34:33 1.343
6	BETTE	NICHOLSON	2006-02-15 09:34:33 5.0
7	GRACE	MOSTEL	2006-02-15 09:34:33 6.0
8	MATTHEW	JOHANSSON	2006-02-15 09:34:33 7.0
9	JOE	SWANK	2006-02-15 09:34:33 8.0
10	CHRISTIAN	GABLE	2006-02-15 09:34:33 9.1
11	ZERO	CAGE	2006-02-15 09:34:33 10.001
12	KARL	BERRY	2017-11-02 19:15:42.308637+08 11.001
A Fateful Reflection of a Waitress And a Boat who must Discover a Sumo Wrestler in Ancient China
Kwara & Kogi
{"Deleted Scenes","Behind the Scenes"}
'awe':5 'awe-inspir':4 'barbarella':1 'cat':13 'conquer':16 'dog':18 'feminist':10 'inspir':6 'monasteri':21 'must':15 'stori':7 'streetcar':2
PHP	₱ USD $
\N  Some other value
\\."#;
    let ast = pg_and_generic().one_statement_parses_to(sql, "");
    println!("{:#?}", ast);
    //assert_eq!(sql, ast.to_string());
}

#[test]
fn parse_update_set_from() {
    let sql = "UPDATE t1 SET name = t2.name FROM (SELECT name, id FROM t1 GROUP BY id) AS t2 WHERE t1.id = t2.id";
    let stmt = pg().verified_stmt(sql);
    assert_eq!(
        stmt,
        Statement::Update {
            table: TableWithJoins {
                relation: TableFactor::Table {
                    name: ObjectName(vec![Ident::new("t1")]),
                    alias: None,
                    args: vec![],
                    with_hints: vec![],
                },
                joins: vec![],
            },
            assignments: vec![Assignment {
                id: vec![Ident::new("name")],
                value: Expr::CompoundIdentifier(vec![Ident::new("t2"), Ident::new("name")])
            }],
            from: Some(TableWithJoins {
                relation: TableFactor::Derived {
                    lateral: false,
                    subquery: Box::new(Query {
                        with: None,
                        body: SetExpr::Select(Box::new(Select {
                            distinct: false,
                            top: None,
                            projection: vec![
                                SelectItem::UnnamedExpr(Expr::Identifier(Ident::new("name"))),
                                SelectItem::UnnamedExpr(Expr::Identifier(Ident::new("id"))),
                            ],
                            into: None,
                            from: vec![TableWithJoins {
                                relation: TableFactor::Table {
                                    name: ObjectName(vec![Ident::new("t1")]),
                                    alias: None,
                                    args: vec![],
                                    with_hints: vec![],
                                },
                                joins: vec![],
                            }],
                            lateral_views: vec![],
                            selection: None,
                            group_by: vec![Expr::Identifier(Ident::new("id"))],
                            cluster_by: vec![],
                            distribute_by: vec![],
                            sort_by: vec![],
                            having: None,
                        })),
                        order_by: vec![],
                        limit: None,
                        offset: None,
                        fetch: None,
                        lock: None,
                    }),
                    alias: Some(TableAlias {
                        name: Ident::new("t2"),
                        columns: vec![],
                    })
                },
                joins: vec![],
            }),
            selection: Some(Expr::BinaryOp {
                left: Box::new(Expr::CompoundIdentifier(vec![
                    Ident::new("t1"),
                    Ident::new("id")
                ])),
                op: BinaryOperator::Eq,
                right: Box::new(Expr::CompoundIdentifier(vec![
                    Ident::new("t2"),
                    Ident::new("id")
                ])),
            }),
        }
    );
}

#[test]
fn test_copy_from() {
    let stmt = pg().verified_stmt("COPY users FROM 'data.csv'");
    assert_eq!(
        stmt,
        Statement::Copy {
            table_name: ObjectName(vec!["users".into()]),
            columns: vec![],
            to: false,
            target: CopyTarget::File {
                filename: "data.csv".to_string(),
            },
            options: vec![],
            legacy_options: vec![],
            values: vec![],
        }
    );

    let stmt = pg().verified_stmt("COPY users FROM 'data.csv' DELIMITER ','");
    assert_eq!(
        stmt,
        Statement::Copy {
            table_name: ObjectName(vec!["users".into()]),
            columns: vec![],
            to: false,
            target: CopyTarget::File {
                filename: "data.csv".to_string(),
            },
            options: vec![],
            legacy_options: vec![CopyLegacyOption::Delimiter(',')],
            values: vec![],
        }
    );

    let stmt = pg().verified_stmt("COPY users FROM 'data.csv' DELIMITER ',' CSV HEADER");
    assert_eq!(
        stmt,
        Statement::Copy {
            table_name: ObjectName(vec!["users".into()]),
            columns: vec![],
            to: false,
            target: CopyTarget::File {
                filename: "data.csv".to_string(),
            },
            options: vec![],
            legacy_options: vec![
                CopyLegacyOption::Delimiter(','),
                CopyLegacyOption::Csv(vec![CopyLegacyCsvOption::Header,])
            ],
            values: vec![],
        }
    );
}

#[test]
fn test_copy_to() {
    let stmt = pg().verified_stmt("COPY users TO 'data.csv'");
    assert_eq!(
        stmt,
        Statement::Copy {
            table_name: ObjectName(vec!["users".into()]),
            columns: vec![],
            to: true,
            target: CopyTarget::File {
                filename: "data.csv".to_string(),
            },
            options: vec![],
            legacy_options: vec![],
            values: vec![],
        }
    );

    let stmt = pg().verified_stmt("COPY users TO 'data.csv' DELIMITER ','");
    assert_eq!(
        stmt,
        Statement::Copy {
            table_name: ObjectName(vec!["users".into()]),
            columns: vec![],
            to: true,
            target: CopyTarget::File {
                filename: "data.csv".to_string(),
            },
            options: vec![],
            legacy_options: vec![CopyLegacyOption::Delimiter(',')],
            values: vec![],
        }
    );

    let stmt = pg().verified_stmt("COPY users TO 'data.csv' DELIMITER ',' CSV HEADER");
    assert_eq!(
        stmt,
        Statement::Copy {
            table_name: ObjectName(vec!["users".into()]),
            columns: vec![],
            to: true,
            target: CopyTarget::File {
                filename: "data.csv".to_string(),
            },
            options: vec![],
            legacy_options: vec![
                CopyLegacyOption::Delimiter(','),
                CopyLegacyOption::Csv(vec![CopyLegacyCsvOption::Header,])
            ],
            values: vec![],
        }
    )
}

#[test]
fn parse_copy_from() {
    let sql = "COPY table (a, b) FROM 'file.csv' WITH
    (
        FORMAT CSV,
        FREEZE,
        FREEZE TRUE,
        FREEZE FALSE,
        DELIMITER ',',
        NULL '',
        HEADER,
        HEADER TRUE,
        HEADER FALSE,
        QUOTE '\"',
        ESCAPE '\\',
        FORCE_QUOTE (a, b),
        FORCE_NOT_NULL (a),
        FORCE_NULL (b),
        ENCODING 'utf8'
    )";
    assert_eq!(
        pg_and_generic().one_statement_parses_to(sql, ""),
        Statement::Copy {
            table_name: ObjectName(vec!["table".into()]),
            columns: vec!["a".into(), "b".into()],
            to: false,
            target: CopyTarget::File {
                filename: "file.csv".into()
            },
            options: vec![
                CopyOption::Format("CSV".into()),
                CopyOption::Freeze(true),
                CopyOption::Freeze(true),
                CopyOption::Freeze(false),
                CopyOption::Delimiter(','),
                CopyOption::Null("".into()),
                CopyOption::Header(true),
                CopyOption::Header(true),
                CopyOption::Header(false),
                CopyOption::Quote('"'),
                CopyOption::Escape('\\'),
                CopyOption::ForceQuote(vec!["a".into(), "b".into()]),
                CopyOption::ForceNotNull(vec!["a".into()]),
                CopyOption::ForceNull(vec!["b".into()]),
                CopyOption::Encoding("utf8".into()),
            ],
            legacy_options: vec![],
            values: vec![],
        }
    );
}

#[test]
fn parse_copy_to() {
    let stmt = pg().verified_stmt("COPY users TO 'data.csv'");
    assert_eq!(
        stmt,
        Statement::Copy {
            table_name: ObjectName(vec!["users".into()]),
            columns: vec![],
            to: true,
            target: CopyTarget::File {
                filename: "data.csv".to_string(),
            },
            options: vec![],
            legacy_options: vec![],
            values: vec![],
        }
    );

    let stmt = pg().verified_stmt("COPY country TO STDOUT (DELIMITER '|')");
    assert_eq!(
        stmt,
        Statement::Copy {
            table_name: ObjectName(vec!["country".into()]),
            columns: vec![],
            to: true,
            target: CopyTarget::Stdout,
            options: vec![CopyOption::Delimiter('|')],
            legacy_options: vec![],
            values: vec![],
        }
    );

    let stmt =
        pg().verified_stmt("COPY country TO PROGRAM 'gzip > /usr1/proj/bray/sql/country_data.gz'");
    assert_eq!(
        stmt,
        Statement::Copy {
            table_name: ObjectName(vec!["country".into()]),
            columns: vec![],
            to: true,
            target: CopyTarget::Program {
                command: "gzip > /usr1/proj/bray/sql/country_data.gz".into(),
            },
            options: vec![],
            legacy_options: vec![],
            values: vec![],
        }
    );
}

#[test]
fn parse_copy_from_before_v9_0() {
    let stmt = pg().verified_stmt("COPY users FROM 'data.csv' BINARY DELIMITER ',' NULL 'null' CSV HEADER QUOTE '\"' ESCAPE '\\' FORCE NOT NULL column");
    assert_eq!(
        stmt,
        Statement::Copy {
            table_name: ObjectName(vec!["users".into()]),
            columns: vec![],
            to: false,
            target: CopyTarget::File {
                filename: "data.csv".to_string(),
            },
            options: vec![],
            legacy_options: vec![
                CopyLegacyOption::Binary,
                CopyLegacyOption::Delimiter(','),
                CopyLegacyOption::Null("null".into()),
                CopyLegacyOption::Csv(vec![
                    CopyLegacyCsvOption::Header,
                    CopyLegacyCsvOption::Quote('\"'),
                    CopyLegacyCsvOption::Escape('\\'),
                    CopyLegacyCsvOption::ForceNotNull(vec!["column".into()]),
                ]),
            ],
            values: vec![],
        }
    );

    // test 'AS' keyword
    let sql = "COPY users FROM 'data.csv' DELIMITER AS ',' NULL AS 'null' CSV QUOTE AS '\"' ESCAPE AS '\\'";
    assert_eq!(
        pg_and_generic().one_statement_parses_to(sql, ""),
        Statement::Copy {
            table_name: ObjectName(vec!["users".into()]),
            columns: vec![],
            to: false,
            target: CopyTarget::File {
                filename: "data.csv".to_string(),
            },
            options: vec![],
            legacy_options: vec![
                CopyLegacyOption::Delimiter(','),
                CopyLegacyOption::Null("null".into()),
                CopyLegacyOption::Csv(vec![
                    CopyLegacyCsvOption::Quote('\"'),
                    CopyLegacyCsvOption::Escape('\\'),
                ]),
            ],
            values: vec![],
        }
    );
}

#[test]
fn parse_copy_to_before_v9_0() {
    let stmt = pg().verified_stmt("COPY users TO 'data.csv' BINARY DELIMITER ',' NULL 'null' CSV HEADER QUOTE '\"' ESCAPE '\\' FORCE QUOTE column");
    assert_eq!(
        stmt,
        Statement::Copy {
            table_name: ObjectName(vec!["users".into()]),
            columns: vec![],
            to: true,
            target: CopyTarget::File {
                filename: "data.csv".to_string(),
            },
            options: vec![],
            legacy_options: vec![
                CopyLegacyOption::Binary,
                CopyLegacyOption::Delimiter(','),
                CopyLegacyOption::Null("null".into()),
                CopyLegacyOption::Csv(vec![
                    CopyLegacyCsvOption::Header,
                    CopyLegacyCsvOption::Quote('\"'),
                    CopyLegacyCsvOption::Escape('\\'),
                    CopyLegacyCsvOption::ForceQuote(vec!["column".into()]),
                ]),
            ],
            values: vec![],
        }
    )
}

#[test]
fn parse_set() {
    let stmt = pg_and_generic().verified_stmt("SET a = b");
    assert_eq!(
        stmt,
        Statement::SetVariable {
            key_values: [SetVariableKeyValue {
                key: "a".into(),
                value: vec![Expr::Identifier(Ident {
                    value: "b".into(),
                    quote_style: None
                })],
                local: false,
                hivevar: false,
            }]
            .to_vec()
        }
    );

    let stmt = pg().verified_stmt("SET a = b, c");
    assert_eq!(
        stmt,
        Statement::SetVariable {
            key_values: [SetVariableKeyValue {
                key: "a".into(),
                value: vec![
                    Expr::Identifier(Ident {
                        value: "b".into(),
                        quote_style: None
                    }),
                    Expr::Identifier(Ident {
                        value: "c".into(),
                        quote_style: None
                    }),
                ],
                local: false,
                hivevar: false,
            }]
            .to_vec()
        }
    );

    let stmt = pg_and_generic().verified_stmt("SET a = 'b'");
    assert_eq!(
        stmt,
        Statement::SetVariable {
            key_values: [SetVariableKeyValue {
                local: false,
                hivevar: false,
                key: "a".into(),
                value: vec![Expr::Value(Value::SingleQuotedString("b".into()))],
            }]
            .to_vec()
        }
    );

    let stmt = pg_and_generic().verified_stmt("SET a = 0");

    #[cfg(feature = "bigdecimal")]
    let value = Expr::Value(Value::Number(bigdecimal::BigDecimal::from(0_i64), false));
    #[cfg(not(feature = "bigdecimal"))]
    let value = Expr::Value(Value::Number("0".into(), false));

    assert_eq!(
        stmt,
        Statement::SetVariable {
            key_values: [SetVariableKeyValue {
                local: false,
                hivevar: false,
                key: "a".into(),
                value: vec![value],
            }]
            .to_vec()
        }
    );

    let stmt = pg_and_generic().verified_stmt("SET a = DEFAULT");
    assert_eq!(
        stmt,
        Statement::SetVariable {
            key_values: [SetVariableKeyValue {
                local: false,
                hivevar: false,
                key: "a".into(),
                value: vec![Expr::Identifier(Ident {
                    value: "DEFAULT".into(),
                    quote_style: None
                })],
            }]
            .to_vec()
        }
    );

    let stmt = pg_and_generic().verified_stmt("SET LOCAL a = b");
    assert_eq!(
        stmt,
        Statement::SetVariable {
            key_values: [SetVariableKeyValue {
                local: true,
                hivevar: false,
                key: "a".into(),
                value: vec![Expr::Identifier(Ident {
                    value: "b".into(),
                    quote_style: None
                })],
            }]
            .to_vec()
        }
    );

    pg_and_generic().one_statement_parses_to("SET a TO b", "SET a = b");
    pg_and_generic().one_statement_parses_to("SET SESSION a = b", "SET a = b");

    assert_eq!(
        pg_and_generic().parse_sql_statements("SET"),
        Err(ParserError::ParserError(
            "Expected identifier, found: EOF".to_string()
        )),
    );

    assert_eq!(
        pg_and_generic().parse_sql_statements("SET a b"),
        Err(ParserError::ParserError(
            "Expected equals sign or TO, found: b".to_string()
        )),
    );

    assert_eq!(
        pg_and_generic().parse_sql_statements("SET a ="),
        Err(ParserError::ParserError(
            "Expected variable value, found: EOF".to_string()
        )),
    );
}

#[test]
fn parse_set_role() {
    let stmt = pg_and_generic().verified_stmt("SET SESSION ROLE NONE");
    assert_eq!(
        stmt,
        Statement::SetRole {
            local: false,
            session: true,
            role_name: None,
        }
    );

    let stmt = pg_and_generic().one_statement_parses_to(
        "SET LOCAL ROLE = \"rolename\"",
        "SET LOCAL ROLE \"rolename\"",
    );
    assert_eq!(
        stmt,
        Statement::SetRole {
            local: true,
            session: false,
            role_name: Some(Ident {
                value: "rolename".to_string(),
                quote_style: Some('\"'),
            }),
        }
    );

    let stmt =
        pg_and_generic().one_statement_parses_to("SET ROLE TO 'rolename'", "SET ROLE 'rolename'");
    assert_eq!(
        stmt,
        Statement::SetRole {
            local: false,
            session: false,
            role_name: Some(Ident {
                value: "rolename".to_string(),
                quote_style: Some('\''),
            }),
        }
    );
}

#[test]
fn parse_set_time_zone() {
    let stmt = pg().verified_stmt("SET SESSION TIME ZONE DEFAULT");
    assert_eq!(
        stmt,
        Statement::SetTimeZone {
            local: false,
            session: true,
            timezone: Expr::Identifier(Ident {
                value: "DEFAULT".to_string(),
                quote_style: None,
            }),
        }
    );

    let stmt = pg().verified_stmt("SET LOCAL TIME ZONE 'Europe/Rome'");
    assert_eq!(
        stmt,
        Statement::SetTimeZone {
            local: true,
            session: false,
            timezone: Expr::Value(Value::SingleQuotedString("Europe/Rome".to_string())),
        }
    );

    let stmt = pg().verified_stmt("SET TIME ZONE LOCAL");
    assert_eq!(
        stmt,
        Statement::SetTimeZone {
            local: false,
            session: false,
            timezone: Expr::Identifier(Ident {
                value: "LOCAL".to_string(),
                quote_style: None,
            }),
        }
    );
}

#[test]
fn parse_show() {
    let stmt = pg_and_generic().verified_stmt("SHOW a a");
    assert_eq!(
        stmt,
        Statement::ShowVariable {
            variable: vec!["a".into(), "a".into()]
        }
    );

    let stmt = pg_and_generic().verified_stmt("SHOW ALL ALL");
    assert_eq!(
        stmt,
        Statement::ShowVariable {
            variable: vec!["ALL".into(), "ALL".into()]
        }
    )
}

#[test]
fn parse_deallocate() {
    let stmt = pg_and_generic().verified_stmt("DEALLOCATE a");
    assert_eq!(
        stmt,
        Statement::Deallocate {
            name: "a".into(),
            prepare: false,
        }
    );

    let stmt = pg_and_generic().verified_stmt("DEALLOCATE ALL");
    assert_eq!(
        stmt,
        Statement::Deallocate {
            name: "ALL".into(),
            prepare: false,
        }
    );

    let stmt = pg_and_generic().verified_stmt("DEALLOCATE PREPARE a");
    assert_eq!(
        stmt,
        Statement::Deallocate {
            name: "a".into(),
            prepare: true,
        }
    );

    let stmt = pg_and_generic().verified_stmt("DEALLOCATE PREPARE ALL");
    assert_eq!(
        stmt,
        Statement::Deallocate {
            name: "ALL".into(),
            prepare: true,
        }
    );
}

#[test]
fn parse_execute() {
    let stmt = pg_and_generic().verified_stmt("EXECUTE a");
    assert_eq!(
        stmt,
        Statement::Execute {
            name: "a".into(),
            parameters: vec![],
        }
    );

    let stmt = pg_and_generic().verified_stmt("EXECUTE a(1, 't')");
    assert_eq!(
        stmt,
        Statement::Execute {
            name: "a".into(),
            parameters: vec![
                Expr::Value(number("1")),
                Expr::Value(Value::SingleQuotedString("t".to_string()))
            ],
        }
    );
}

#[test]
fn parse_prepare() {
    let stmt =
        pg_and_generic().verified_stmt("PREPARE a AS INSERT INTO customers VALUES (a1, a2, a3)");
    let sub_stmt = match stmt {
        Statement::Prepare {
            name,
            data_types,
            statement,
            ..
        } => {
            assert_eq!(name, "a".into());
            assert!(data_types.is_empty());

            statement
        }
        _ => unreachable!(),
    };
    match sub_stmt.as_ref() {
        Statement::Insert {
            table_name,
            columns,
            source,
            ..
        } => {
            assert_eq!(table_name.to_string(), "customers");
            assert!(columns.is_empty());

            let expected_values = [vec![
                Expr::Identifier("a1".into()),
                Expr::Identifier("a2".into()),
                Expr::Identifier("a3".into()),
            ]];
            match &source.body {
                SetExpr::Values(Values(values)) => assert_eq!(values.as_slice(), &expected_values),
                _ => unreachable!(),
            }
        }
        _ => unreachable!(),
    };

    let stmt = pg_and_generic()
        .verified_stmt("PREPARE a (INT, TEXT) AS SELECT * FROM customers WHERE customers.id = a1");
    let sub_stmt = match stmt {
        Statement::Prepare {
            name,
            data_types,
            statement,
            ..
        } => {
            assert_eq!(name, "a".into());
            assert_eq!(data_types, vec![DataType::Int(None), DataType::Text]);

            statement
        }
        _ => unreachable!(),
    };
    assert_eq!(
        sub_stmt,
        Box::new(Statement::Query(Box::new(pg_and_generic().verified_query(
            "SELECT * FROM customers WHERE customers.id = a1"
        ))))
    );
}

#[test]
fn parse_pg_bitwise_binary_ops() {
    let bitwise_ops = &[
        // Sharp char cannot be used with Generic Dialect, it conflicts with identifiers
        ("#", BinaryOperator::PGBitwiseXor, pg()),
        (">>", BinaryOperator::PGBitwiseShiftRight, pg_and_generic()),
        ("<<", BinaryOperator::PGBitwiseShiftLeft, pg_and_generic()),
    ];

    for (str_op, op, dialects) in bitwise_ops {
        let select = dialects.verified_only_select(&format!("SELECT a {} b", &str_op));
        assert_eq!(
            SelectItem::UnnamedExpr(Expr::BinaryOp {
                left: Box::new(Expr::Identifier(Ident::new("a"))),
                op: op.clone(),
                right: Box::new(Expr::Identifier(Ident::new("b"))),
            }),
            select.projection[0]
        );
    }
}

#[test]
fn parse_pg_unary_ops() {
    let pg_unary_ops = &[
        ("~", UnaryOperator::PGBitwiseNot),
        ("|/", UnaryOperator::PGSquareRoot),
        ("||/", UnaryOperator::PGCubeRoot),
        ("!!", UnaryOperator::PGPrefixFactorial),
        ("@", UnaryOperator::PGAbs),
    ];

    for (str_op, op) in pg_unary_ops {
        let select = pg().verified_only_select(&format!("SELECT {} a", &str_op));
        assert_eq!(
            SelectItem::UnnamedExpr(Expr::UnaryOp {
                op: op.clone(),
                expr: Box::new(Expr::Identifier(Ident::new("a"))),
            }),
            select.projection[0]
        );
    }
}

#[test]
fn parse_pg_postfix_factorial() {
    let postfix_factorial = &[("!", UnaryOperator::PGPostfixFactorial)];

    for (str_op, op) in postfix_factorial {
        let select = pg().verified_only_select(&format!("SELECT a{}", &str_op));
        assert_eq!(
            SelectItem::UnnamedExpr(Expr::UnaryOp {
                op: op.clone(),
                expr: Box::new(Expr::Identifier(Ident::new("a"))),
            }),
            select.projection[0]
        );
    }
}

#[test]
fn parse_pg_regex_match_ops() {
    let pg_regex_match_ops = &[
        ("~", BinaryOperator::PGRegexMatch),
        ("~*", BinaryOperator::PGRegexIMatch),
        ("!~", BinaryOperator::PGRegexNotMatch),
        ("!~*", BinaryOperator::PGRegexNotIMatch),
    ];

    for (str_op, op) in pg_regex_match_ops {
        let select = pg().verified_only_select(&format!("SELECT 'abc' {} '^a'", &str_op));
        assert_eq!(
            SelectItem::UnnamedExpr(Expr::BinaryOp {
                left: Box::new(Expr::Value(Value::SingleQuotedString("abc".into()))),
                op: op.clone(),
                right: Box::new(Expr::Value(Value::SingleQuotedString("^a".into()))),
            }),
            select.projection[0]
        );
    }
}

#[test]
fn parse_array_index_expr() {
    #[cfg(feature = "bigdecimal")]
    let num: Vec<Expr> = (0..=10)
        .into_iter()
        .map(|s| Expr::Value(Value::Number(bigdecimal::BigDecimal::from(s), false)))
        .collect();
    #[cfg(not(feature = "bigdecimal"))]
    let num: Vec<Expr> = (0..=10)
        .into_iter()
        .map(|s| Expr::Value(Value::Number(s.to_string(), false)))
        .collect();

    let sql = "SELECT foo[0] FROM foos";
    let select = pg().verified_only_select(sql);
    assert_eq!(
        &Expr::ArrayIndex {
            obj: Box::new(Expr::Identifier(Ident::new("foo"))),
            indexs: vec![num[0].clone()],
        },
        expr_from_projection(only(&select.projection)),
    );

    let sql = "SELECT foo[0][0] FROM foos";
    let select = pg().verified_only_select(sql);
    assert_eq!(
        &Expr::ArrayIndex {
            obj: Box::new(Expr::Identifier(Ident::new("foo"))),
            indexs: vec![num[0].clone(), num[0].clone()],
        },
        expr_from_projection(only(&select.projection)),
    );

    let sql = r#"SELECT bar[0]["baz"]["fooz"] FROM foos"#;
    let select = pg().verified_only_select(sql);
    assert_eq!(
        &Expr::ArrayIndex {
            obj: Box::new(Expr::Identifier(Ident::new("bar"))),
            indexs: vec![
                num[0].clone(),
                Expr::Identifier(Ident {
                    value: "baz".to_string(),
                    quote_style: Some('"')
                }),
                Expr::Identifier(Ident {
                    value: "fooz".to_string(),
                    quote_style: Some('"')
                })
            ],
        },
        expr_from_projection(only(&select.projection)),
    );

    let sql = "SELECT (CAST(ARRAY[ARRAY[2, 3]] AS INT[][]))[1][2]";
    let select = pg().verified_only_select(sql);
    assert_eq!(
        &Expr::ArrayIndex {
            obj: Box::new(Expr::Nested(Box::new(Expr::Cast {
                expr: Box::new(Expr::Array(Array {
                    elem: vec![Expr::Array(Array {
                        elem: vec![num[2].clone(), num[3].clone(),],
                        named: true,
                    })],
                    named: true,
                })),
                data_type: DataType::Array(Box::new(DataType::Array(Box::new(DataType::Int(
                    None
                )))))
            }))),
            indexs: vec![num[1].clone(), num[2].clone()],
        },
        expr_from_projection(only(&select.projection)),
    );

    let sql = "SELECT ARRAY[]";
    let select = pg_and_generic().verified_only_select(sql);
    assert_eq!(
        &Expr::Array(sqlparser::ast::Array {
            elem: vec![],
            named: true
        }),
        expr_from_projection(only(&select.projection)),
    );
}

#[test]
fn parse_array_subquery_expr() {
    let sql = "SELECT ARRAY(SELECT 1 UNION SELECT 2)";
    let select = pg().verified_only_select(sql);
    assert_eq!(
        &Expr::ArraySubquery(Box::new(Query {
            with: None,
            body: SetExpr::SetOperation {
                op: SetOperator::Union,
                option: None,
                left: Box::new(SetExpr::Select(Box::new(Select {
                    distinct: false,
                    top: None,
                    projection: vec![SelectItem::UnnamedExpr(Expr::Value(Value::Number(
                        #[cfg(not(feature = "bigdecimal"))]
                        "1".to_string(),
                        #[cfg(feature = "bigdecimal")]
                        "1".parse().unwrap(),
                        false,
                    )))],
                    into: None,
                    from: vec![],
                    lateral_views: vec![],
                    selection: None,
                    group_by: vec![],
                    cluster_by: vec![],
                    distribute_by: vec![],
                    sort_by: vec![],
                    having: None,
                }))),
                right: Box::new(SetExpr::Select(Box::new(Select {
                    distinct: false,
                    top: None,
                    projection: vec![SelectItem::UnnamedExpr(Expr::Value(Value::Number(
                        #[cfg(not(feature = "bigdecimal"))]
                        "2".to_string(),
                        #[cfg(feature = "bigdecimal")]
                        "2".parse().unwrap(),
                        false,
                    )))],
                    into: None,
                    from: vec![],
                    lateral_views: vec![],
                    selection: None,
                    group_by: vec![],
                    cluster_by: vec![],
                    distribute_by: vec![],
                    sort_by: vec![],
                    having: None,
                }))),
            },
            order_by: vec![],
            limit: None,
            offset: None,
            fetch: None,
            lock: None,
        })),
        expr_from_projection(only(&select.projection)),
    );
}

#[test]
fn test_transaction_statement() {
    let statement = pg().verified_stmt("SET TRANSACTION SNAPSHOT '000003A1-1'");
    assert_eq!(
        statement,
        Statement::SetTransaction {
            modes: vec![],
            snapshot: Some(Value::SingleQuotedString(String::from("000003A1-1"))),
            global: None,
            characteristics_as: false,
        }
    );
    let statement = pg().verified_stmt("SET SESSION CHARACTERISTICS AS TRANSACTION READ ONLY, READ WRITE, ISOLATION LEVEL SERIALIZABLE");
    assert_eq!(
        statement,
        Statement::SetTransaction {
            modes: vec![
                TransactionMode::AccessMode(TransactionAccessMode::ReadOnly),
                TransactionMode::AccessMode(TransactionAccessMode::ReadWrite),
                TransactionMode::IsolationLevel(TransactionIsolationLevel::Serializable),
            ],
            snapshot: None,
            global: Some(false),
            characteristics_as: true,
        }
    );
}

#[test]
fn test_savepoint() {
    match pg().verified_stmt("SAVEPOINT test1") {
        Statement::Savepoint { name } => {
            assert_eq!(Ident::new("test1"), name);
        }
        _ => unreachable!(),
    }
}

#[test]
fn test_release() {
    match pg().verified_stmt("RELEASE test1") {
        Statement::Release { name } => {
            assert_eq!(Ident::new("test1"), name);
        }
        _ => unreachable!(),
    }

    pg_and_generic().one_statement_parses_to("RELEASE SAVEPOINT foo", "RELEASE foo");
}

#[test]
fn parse_comments() {
    match pg().verified_stmt("COMMENT ON COLUMN tab.name IS 'comment'") {
        Statement::Comment {
            object_type,
            object_name,
            comment: Some(comment),
        } => {
            assert_eq!("comment", comment);
            assert_eq!("tab.name", object_name.to_string());
            assert_eq!(CommentObject::Column, object_type);
        }
        _ => unreachable!(),
    }

    match pg().verified_stmt("COMMENT ON TABLE public.tab IS 'comment'") {
        Statement::Comment {
            object_type,
            object_name,
            comment: Some(comment),
        } => {
            assert_eq!("comment", comment);
            assert_eq!("public.tab", object_name.to_string());
            assert_eq!(CommentObject::Table, object_type);
        }
        _ => unreachable!(),
    }

    match pg().verified_stmt("COMMENT ON TABLE public.tab IS NULL") {
        Statement::Comment {
            object_type,
            object_name,
            comment: None,
        } => {
            assert_eq!("public.tab", object_name.to_string());
            assert_eq!(CommentObject::Table, object_type);
        }
        _ => unreachable!(),
    }
}

#[test]
fn parse_quoted_identifier() {
    pg_and_generic().verified_stmt(r#"SELECT "quoted "" ident""#);
}

#[test]
fn parse_local_and_global() {
    pg_and_generic().verified_stmt("CREATE LOCAL TEMPORARY TABLE table (COL INT)");
}

#[test]
fn parse_on_commit() {
    pg_and_generic()
        .verified_stmt("CREATE TEMPORARY TABLE table (COL INT) ON COMMIT PRESERVE ROWS");

    pg_and_generic().verified_stmt("CREATE TEMPORARY TABLE table (COL INT) ON COMMIT DELETE ROWS");

    pg_and_generic().verified_stmt("CREATE TEMPORARY TABLE table (COL INT) ON COMMIT DROP");
}

fn pg() -> TestedDialects {
    TestedDialects {
        dialects: vec![Box::new(PostgreSqlDialect {})],
    }
}

fn pg_and_generic() -> TestedDialects {
    TestedDialects {
        dialects: vec![Box::new(PostgreSqlDialect {}), Box::new(GenericDialect {})],
    }
}

#[test]
fn parse_escaped_literal_string() {
    let sql =
        r#"SELECT E's1 \n s1', E's2 \\n s2', E's3 \\\n s3', E's4 \\\\n s4', E'\'', E'foo \\'"#;
    let select = pg().verified_only_select(sql);
    assert_eq!(6, select.projection.len());
    assert_eq!(
        &Expr::Value(Value::EscapedStringLiteral("s1 \n s1".to_string())),
        expr_from_projection(&select.projection[0])
    );
    assert_eq!(
        &Expr::Value(Value::EscapedStringLiteral("s2 \\n s2".to_string())),
        expr_from_projection(&select.projection[1])
    );
    assert_eq!(
        &Expr::Value(Value::EscapedStringLiteral("s3 \\\n s3".to_string())),
        expr_from_projection(&select.projection[2])
    );
    assert_eq!(
        &Expr::Value(Value::EscapedStringLiteral("s4 \\\\n s4".to_string())),
        expr_from_projection(&select.projection[3])
    );
    assert_eq!(
        &Expr::Value(Value::EscapedStringLiteral("'".to_string())),
        expr_from_projection(&select.projection[4])
    );
    assert_eq!(
        &Expr::Value(Value::EscapedStringLiteral("foo \\".to_string())),
        expr_from_projection(&select.projection[5])
    );

    let sql = r#"SELECT E'\'"#;
    assert_eq!(
        pg().parse_sql_statements(sql).unwrap_err().to_string(),
        "sql parser error: Unterminated encoded string literal at Line: 1, Column 8"
    );
}

#[test]
fn parse_current_functions() {
    let sql = "SELECT CURRENT_CATALOG, CURRENT_USER, SESSION_USER, USER";
    let select = pg_and_generic().verified_only_select(sql);
    assert_eq!(
        &Expr::Function(Function {
            name: ObjectName(vec![Ident::new("CURRENT_CATALOG")]),
            args: vec![],
            over: None,
            distinct: false,
            special: true,
            approximate: false,
        }),
        expr_from_projection(&select.projection[0])
    );
    assert_eq!(
        &Expr::Function(Function {
            name: ObjectName(vec![Ident::new("CURRENT_USER")]),
            args: vec![],
            over: None,
            distinct: false,
            special: true,
            approximate: false,
        }),
        expr_from_projection(&select.projection[1])
    );
    assert_eq!(
        &Expr::Function(Function {
            name: ObjectName(vec![Ident::new("SESSION_USER")]),
            args: vec![],
            over: None,
            distinct: false,
            special: true,
            approximate: false,
        }),
        expr_from_projection(&select.projection[2])
    );
    assert_eq!(
        &Expr::Function(Function {
            name: ObjectName(vec![Ident::new("USER")]),
            args: vec![],
            over: None,
            distinct: false,
            special: true,
            approximate: false,
        }),
        expr_from_projection(&select.projection[3])
    );
}

#[test]
fn parse_fetch() {
    pg_and_generic().verified_stmt("FETCH 2048 IN \"SQL_CUR0x7fa44801bc00\"");
    pg_and_generic().verified_stmt("FETCH 2048 IN \"SQL_CUR0x7fa44801bc00\" INTO \"new_table\"");
    pg_and_generic().verified_stmt("FETCH NEXT IN \"SQL_CUR0x7fa44801bc00\" INTO \"new_table\"");
    pg_and_generic().verified_stmt("FETCH PRIOR IN \"SQL_CUR0x7fa44801bc00\" INTO \"new_table\"");
    pg_and_generic().verified_stmt("FETCH FIRST IN \"SQL_CUR0x7fa44801bc00\" INTO \"new_table\"");
    pg_and_generic().verified_stmt("FETCH LAST IN \"SQL_CUR0x7fa44801bc00\" INTO \"new_table\"");
    pg_and_generic()
        .verified_stmt("FETCH ABSOLUTE 2048 IN \"SQL_CUR0x7fa44801bc00\" INTO \"new_table\"");
    pg_and_generic()
        .verified_stmt("FETCH RELATIVE 2048 IN \"SQL_CUR0x7fa44801bc00\" INTO \"new_table\"");
    pg_and_generic().verified_stmt("FETCH ALL IN \"SQL_CUR0x7fa44801bc00\" INTO \"new_table\"");
    pg_and_generic().verified_stmt("FETCH ALL IN \"SQL_CUR0x7fa44801bc00\" INTO \"new_table\"");
    pg_and_generic()
        .verified_stmt("FETCH FORWARD 2048 IN \"SQL_CUR0x7fa44801bc00\" INTO \"new_table\"");
    pg_and_generic()
        .verified_stmt("FETCH FORWARD ALL IN \"SQL_CUR0x7fa44801bc00\" INTO \"new_table\"");
    pg_and_generic()
        .verified_stmt("FETCH BACKWARD 2048 IN \"SQL_CUR0x7fa44801bc00\" INTO \"new_table\"");
    pg_and_generic()
        .verified_stmt("FETCH BACKWARD ALL IN \"SQL_CUR0x7fa44801bc00\" INTO \"new_table\"");
}

#[test]
fn parse_declare() {
    pg_and_generic()
        .verified_stmt("DECLARE \"SQL_CUR0x7fa44801bc00\" CURSOR WITH HOLD FOR SELECT 1");
    pg_and_generic()
        .verified_stmt("DECLARE \"SQL_CUR0x7fa44801bc00\" CURSOR WITHOUT HOLD FOR SELECT 1");
    pg_and_generic().verified_stmt("DECLARE \"SQL_CUR0x7fa44801bc00\" BINARY CURSOR FOR SELECT 1");
    pg_and_generic()
        .verified_stmt("DECLARE \"SQL_CUR0x7fa44801bc00\" ASENSITIVE CURSOR FOR SELECT 1");
    pg_and_generic()
        .verified_stmt("DECLARE \"SQL_CUR0x7fa44801bc00\" INSENSITIVE CURSOR FOR SELECT 1");
    pg_and_generic().verified_stmt("DECLARE \"SQL_CUR0x7fa44801bc00\" SCROLL CURSOR FOR SELECT 1");
    pg_and_generic()
        .verified_stmt("DECLARE \"SQL_CUR0x7fa44801bc00\" NO SCROLL CURSOR FOR SELECT 1");
    pg_and_generic().verified_stmt("DECLARE \"SQL_CUR0x7fa44801bc00\" BINARY INSENSITIVE SCROLL CURSOR WITH HOLD FOR SELECT * FROM table_name LIMIT 2222");
}

#[test]
fn parse_interval_math() {
    let sql = "SELECT INTERVAL '1 DAY' + INTERVAL '2 DAY'";
    let select = pg_and_generic().verified_only_select(sql);
    assert_eq!(
        &Expr::BinaryOp {
            left: Box::new(Expr::Value(Value::Interval {
                value: Box::new(Expr::Value(Value::SingleQuotedString("1 DAY".to_string()))),
                leading_field: None,
                leading_precision: None,
                last_field: None,
                fractional_seconds_precision: None,
            })),
            op: BinaryOperator::Plus,
            right: Box::new(Expr::Value(Value::Interval {
                value: Box::new(Expr::Value(Value::SingleQuotedString("2 DAY".to_string()))),
                leading_field: None,
                leading_precision: None,
                last_field: None,
                fractional_seconds_precision: None,
            })),
        },
        expr_from_projection(only(&select.projection)),
    );

    let sql = "SELECT INTERVAL '1' || ' DAY' + INTERVAL '2 DAY'";
    let select = pg_and_generic().verified_only_select(sql);
    assert_eq!(
        &Expr::BinaryOp {
            left: Box::new(Expr::Value(Value::Interval {
                value: Box::new(Expr::BinaryOp {
                    left: Box::new(Expr::Value(Value::SingleQuotedString("1".to_string()))),
                    op: BinaryOperator::StringConcat,
                    right: Box::new(Expr::Value(Value::SingleQuotedString(" DAY".to_string()))),
                }),
                leading_field: None,
                leading_precision: None,
                last_field: None,
                fractional_seconds_precision: None,
            })),
            op: BinaryOperator::Plus,
            right: Box::new(Expr::Value(Value::Interval {
                value: Box::new(Expr::Value(Value::SingleQuotedString("2 DAY".to_string()))),
                leading_field: None,
                leading_precision: None,
                last_field: None,
                fractional_seconds_precision: None,
            })),
        },
        expr_from_projection(only(&select.projection)),
    );
}

#[test]
fn parse_pg_extract() {
    // FIXME: It's a good idea to add a few more tests, including expr assertion,
    // but `verified_only_select` validates serialization of the query, leading to
    // quote-escaped variant being unquoted.
    //
    // It could be fixed with an addition of `quote_style` field in Expr::Extract
    // but would introduce enough changes to dependents to consider this out-of-scope
    // for the time being as this only benefits tests.
    pg_and_generic().one_statement_parses_to(
        "SELECT EXTRACT('YEAR' from d)",
        "SELECT EXTRACT(YEAR FROM d)",
    );
    pg_and_generic().one_statement_parses_to(
        "SELECT EXTRACT('month' from d)",
        "SELECT EXTRACT(MONTH FROM d)",
    );

    let res = pg_and_generic().parse_sql_statements("SELECT EXTRACT('MILLISECOND' FROM d)");
    assert_eq!(
        ParserError::ParserError("Expected date/time field, found: 'MILLISECOND'".to_string()),
        res.unwrap_err()
    );
}

#[test]
fn parse_approximate_count() {
    let sql = "SELECT APPROXIMATE COUNT(DISTINCT column)";
    let select = pg_and_generic().verified_only_select(sql);
    assert_eq!(
        &Expr::Function(Function {
            name: ObjectName(vec!["COUNT".into()]),
            args: vec![FunctionArg::Unnamed(FunctionArgExpr::Expr(
                Expr::Identifier(Ident::new("column"))
            )),],
            over: None,
            distinct: true,
            special: false,
            approximate: true,
        }),
        expr_from_projection(only(&select.projection)),
    );

    let sql = "SELECT APPROXIMATE AS alias";
    let select = pg_and_generic().verified_only_select(sql);
    assert_eq!(
        SelectItem::ExprWithAlias {
            expr: Expr::Identifier(Ident::new("APPROXIMATE")),
            alias: Ident::new("alias"),
        },
        select.projection[0]
    );

    let sql = "SELECT APPROXIMATE, COUNT(DISTINCT column)";
    let select = pg_and_generic().verified_only_select(sql);
    assert_eq!(
        SelectItem::UnnamedExpr(Expr::Identifier(Ident::new("APPROXIMATE"))),
        select.projection[0]
    );
}