DescribeQuery (children 1)
 TableExpression (children 1)
  Subquery (children 1)
   SelectWithUnionQuery (children 1)
    ExpressionList (children 1)
     SelectQuery (children 2)
      ExpressionList (children 2)
       QualifiedAsterisk (children 1)
        Identifier t1
       QualifiedAsterisk (children 1)
        Identifier t2
      TablesInSelectQuery (children 2)
       TablesInSelectQueryElement (children 1)
        TableExpression (children 1)
         TableIdentifier test_table_join_1 (alias t1)
       TablesInSelectQueryElement (children 2)
        TableExpression (children 1)
         TableIdentifier test_table_join_2 (alias t2)
        TableJoin (children 1)
         Function equals (children 1)
          ExpressionList (children 2)
           Identifier t1.id
           Identifier t2.id