Parse FROM clauses for update statements

sqlparser/lib/src/ast/statements/update.dart

@@ -22,16 +22,18 @@ class UpdateStatement extends CrudStatement
   @override
   TableReference table;
   final List<SetComponent> set;
+  Queryable? from;
   @override
   Expression? where;
 
-  UpdateStatement(
-      {WithClause? withClause,
+  UpdateStatement({
+    WithClause? withClause,
     this.or,
     required this.table,
     required this.set,
-      this.where})
-      : super._(withClause);
+    this.from,
+    this.where,
+  }) : super._(withClause);
 
   @override
   R accept<A, R>(AstVisitor<A, R> visitor, A arg) {
@@ -43,6 +45,7 @@ class UpdateStatement extends CrudStatement
     withClause = transformer.transformNullableChild(withClause, this, arg);
     table = transformer.transformChild(table, this, arg);
     transformer.transformChildren(set, this, arg);
+    from = transformer.transformNullableChild(from, this, arg);
     where = transformer.transformChild(where!, this, arg);
   }
 
@@ -51,6 +54,7 @@ class UpdateStatement extends CrudStatement
         if (withClause != null) withClause!,
         table,
         ...set,
+        if (from != null) from!,
         if (where != null) where!,
       ];
 

sqlparser/lib/src/reader/parser/parser.dart

@@ -1447,6 +1447,7 @@ class Parser {
     _consume(TokenType.set, 'Expected SET after the table name');
 
     final set = _setComponents();
+    final from = _from();
 
     final where = _where();
     return UpdateStatement(
@@ -1454,6 +1455,7 @@ class Parser {
       or: failureMode,
       table: table,
       set: set,
+      from: from,
       where: where,
     )..setSpan(withClause?.first ?? updateToken, _previous);
   }

sqlparser/lib/utils/node_to_text.dart

@@ -101,6 +101,13 @@ class NodeSqlBuilder extends AstVisitor<void, void> {
     }
   }
 
+  void _from(Queryable? from) {
+    if (from != null) {
+      _keyword(TokenType.from);
+      visit(from, null);
+    }
+  }
+
   @override
   void visitAggregateExpression(AggregateExpression e, void arg) {
     _symbol(e.name);
@@ -484,8 +491,7 @@ class NodeSqlBuilder extends AstVisitor<void, void> {
     visitNullable(e.withClause, arg);
 
     _keyword(TokenType.delete);
-    _keyword(TokenType.from);
-    visit(e.from!, null);
+    _from(e.from);
     _where(e.where);
   }
 
@@ -958,10 +964,7 @@ class NodeSqlBuilder extends AstVisitor<void, void> {
 
     _join(e.columns, ',');
 
-    if (e.from != null) {
-      _keyword(TokenType.from);
-      visit(e.from!, arg);
-    }
+    _from(e.from);
     _where(e.where);
     visitNullable(e.groupBy, arg);
     if (e.windowDeclarations.isNotEmpty) {
@@ -1156,6 +1159,7 @@ class NodeSqlBuilder extends AstVisitor<void, void> {
     visit(e.table, arg);
     _keyword(TokenType.set);
     _join(e.set, ',');
+    _from(e.from);
     _where(e.where);
   }
 

sqlparser/test/parser/update_test.dart

@@ -26,4 +26,57 @@ void main() {
   group('update statements', () {
     testAll(testCases);
   });
+
+  test('parses updates with FROM clause', () {
+    testStatement(
+      '''
+      UPDATE inventory
+        SET quantity = quantity - daily.amt
+        FROM (SELECT sum(quantity) AS amt,
+            itemId FROM sales GROUP BY 2) AS daily
+        WHERE inventory.itemId = daily.itemId;
+      ''',
+      UpdateStatement(
+        table: TableReference('inventory'),
+        set: [
+          SetComponent(
+            column: Reference(columnName: 'quantity'),
+            expression: BinaryExpression(
+              Reference(columnName: 'quantity'),
+              token(TokenType.minus),
+              Reference(entityName: 'daily', columnName: 'amt'),
+            ),
+          ),
+        ],
+        from: SelectStatementAsSource(
+          statement: SelectStatement(
+            columns: [
+              ExpressionResultColumn(
+                expression: FunctionExpression(
+                  name: 'sum',
+                  parameters: ExprFunctionParameters(
+                    parameters: [Reference(columnName: 'quantity')],
+                  ),
+                ),
+                as: 'amt',
+              ),
+              ExpressionResultColumn(
+                expression: Reference(columnName: 'itemId'),
+              ),
+            ],
+            from: TableReference('sales'),
+            groupBy: GroupBy(
+              by: [NumericLiteral(2, token(TokenType.numberLiteral))],
+            ),
+          ),
+          as: 'daily',
+        ),
+        where: BinaryExpression(
+          Reference(entityName: 'inventory', columnName: 'itemId'),
+          token(TokenType.equal),
+          Reference(entityName: 'daily', columnName: 'itemId'),
+        ),
+      ),
+    );
+  });
 }

sqlparser/test/utils/node_to_text_test.dart

@@ -239,6 +239,29 @@ CREATE UNIQUE INDEX my_idx ON t1 (c1, c2, c3) WHERE c1 < c3;
             'ON CONFLICT DO UPDATE SET a = b, c = d WHERE d < a;');
       });
     });
+
+    group('update', () {
+      test('simple', () {
+        testFormat('UPDATE foo SET bar = baz WHERE 1;');
+      });
+
+      const modes = [
+        'OR ABORT',
+        'OR FAIL',
+        'OR IGNORE',
+        'OR REPLACE',
+        ' OR ROLLBACK',
+      ];
+      for (var i = 0; i < modes.length; i++) {
+        test('failure mode #$i', () {
+          testFormat('UPDATE ${modes[i]} foo SET bar = baz');
+        });
+      }
+
+      test('from', () {
+        testFormat('UPDATE foo SET bar = baz FROM t1 CROSS JOIN t2');
+      });
+    });
   });
 
   group('expressions', () {