SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Identifier arr
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier index_test
   Function has (children 1)
    ExpressionList (children 2)
     Function arrayMap (children 1)
      ExpressionList (children 3)
       Function lambda (children 1)
        ExpressionList (children 2)
         Function tuple (children 1)
          ExpressionList (children 2)
           Identifier x
           Identifier y
         Function concat (children 1)
          ExpressionList (children 2)
           Function lower (children 1)
            ExpressionList (children 1)
             Identifier x
           Identifier y
       Identifier arr
       Identifier arr
     Literal \'a_12A_12\'
   Set
