SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function if (alias x) (children 1)
     ExpressionList (children 3)
      Literal Bool_1
      Function if (children 1)
       ExpressionList (children 3)
        Function equals (children 1)
         ExpressionList (children 2)
          Function lowerUTF8 (children 1)
           ExpressionList (children 1)
            Identifier arr.key
          Literal \'a\'
        Literal UInt64_1
        Literal UInt64_2
      Literal UInt64_3
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t
    TablesInSelectQueryElement (children 1)
     ArrayJoin (children 1)
      ExpressionList (children 1)
       Identifier arr
