DescribeQuery (children 1)
 TableExpression (children 1)
  Subquery (children 1)
   SelectWithUnionQuery (children 1)
    ExpressionList (children 1)
     SelectQuery (children 2)
      ExpressionList (children 2)
       ColumnsListMatcher (children 1)
        ExpressionList (children 1)
         Identifier id
       ColumnsListMatcher (children 1)
        ExpressionList (children 1)
         Identifier value
      TablesInSelectQuery (children 1)
       TablesInSelectQueryElement (children 1)
        TableExpression (children 1)
         TableIdentifier test_table
