SelectWithUnionQuery (children 1) ExpressionList (children 1) SelectQuery (children 2) ExpressionList (children 1) Function has (children 1) ExpressionList (children 2) Literal Array_[\'a\', NULL, \'def\', \'ghij\'] Identifier col1 TablesInSelectQuery (children 1) TablesInSelectQueryElement (children 1) TableExpression (children 1) TableIdentifier test1_00395