Support UPDATE ... FROM ( subquery ) in some dialects (#694)

* Apply UPDATE SET FROM statement for some dialects

* Add GenericDialect to support

* Test SnowflakeDialect

Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>

src/parser.rs

@@ -5254,7 +5254,9 @@ impl<'a> Parser<'a> {
         let table = self.parse_table_and_joins()?;
         self.expect_keyword(Keyword::SET)?;
         let assignments = self.parse_comma_separated(Parser::parse_assignment)?;
-        let from = if self.parse_keyword(Keyword::FROM) && dialect_of!(self is PostgreSqlDialect) {
+        let from = if self.parse_keyword(Keyword::FROM)
+            && dialect_of!(self is GenericDialect | PostgreSqlDialect | BigQueryDialect | SnowflakeDialect | RedshiftSqlDialect | MsSqlDialect)
+        {
             Some(self.parse_table_and_joins()?)
         } else {
             None

tests/sqlparser_common.rs

@@ -24,7 +24,7 @@ use sqlparser::ast::SelectItem::UnnamedExpr;
 use sqlparser::ast::*;
 use sqlparser::dialect::{
     AnsiDialect, BigQueryDialect, ClickHouseDialect, GenericDialect, HiveDialect, MsSqlDialect,
-    MySqlDialect, PostgreSqlDialect, SQLiteDialect, SnowflakeDialect,
+    MySqlDialect, PostgreSqlDialect, RedshiftSqlDialect, SQLiteDialect, SnowflakeDialect,
 };
 use sqlparser::keywords::ALL_KEYWORDS;
 use sqlparser::parser::{Parser, ParserError};
@@ -186,6 +186,96 @@ fn parse_update() {
     );
 }
 
+#[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 dialects = TestedDialects {
+        dialects: vec![
+            Box::new(GenericDialect {}),
+            Box::new(PostgreSqlDialect {}),
+            Box::new(BigQueryDialect {}),
+            Box::new(SnowflakeDialect {}),
+            Box::new(RedshiftSqlDialect {}),
+            Box::new(MsSqlDialect {}),
+        ],
+    };
+    let stmt = dialects.verified_stmt(sql);
+    assert_eq!(
+        stmt,
+        Statement::Update {
+            table: TableWithJoins {
+                relation: TableFactor::Table {
+                    name: ObjectName(vec![Ident::new("t1")]),
+                    alias: None,
+                    args: None,
+                    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: Box::new(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: None,
+                                    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,
+                            qualify: 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")
+                ])),
+            }),
+            returning: None,
+        }
+    );
+}
+
 #[test]
 fn parse_update_with_table_alias() {
     let sql = "UPDATE users AS u SET u.username = 'new_user' WHERE u.username = 'old_user'";

tests/sqlparser_postgres.rs

@@ -489,86 +489,6 @@ PHP	₱ USD $
     //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: None,
-                    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: Box::new(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: None,
-                                    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,
-                            qualify: 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")
-                ])),
-            }),
-            returning: None,
-        }
-    );
-}
-
 #[test]
 fn test_copy_from() {
     let stmt = pg().verified_stmt("COPY users FROM 'data.csv'");