Generate schema name for function calls

Author: simolus3

sqlparser/lib/utils/node_to_text.dart

@@ -725,6 +725,10 @@ class NodeSqlBuilder extends AstVisitor<void, void> {
 
   @override
   void visitFunction(FunctionExpression e, void arg) {
+    if (e.schemaName != null) {
+      identifier(e.schemaName!, spaceAfter: false);
+      symbol('.');
+    }
     identifier(e.name);
     symbol('(');
     visit(e.parameters, arg);

sqlparser/test/utils/node_to_text_test.dart

@@ -517,6 +517,15 @@ CREATE UNIQUE INDEX my_idx ON t1 (c1, c2, c3) WHERE c1 < c3;
       testFormat('SELECT my_function(*) FROM foo');
       testFormat('SELECT my_function(DISTINCT a, b) FROM foo');
       testFormat('SELECT my_function(a, b) FROM foo');
+
+      expect(
+        FunctionExpression(
+                name: 'bar',
+                schemaName: 'foo',
+                parameters: ExprFunctionParameters())
+            .toSql(),
+        'foo.bar()',
+      );
     });
 
     test('is', () {