SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (alias t1) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 3)
           Literal UInt64_1 (alias a)
           Function toLowCardinality (children 1)
            ExpressionList (children 1)
             Literal UInt64_1
           Literal UInt64_1
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      Subquery (alias t2) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 2)
           Function toLowCardinality (children 1)
            ExpressionList (children 1)
             Literal UInt64_1 (alias a)
           Literal UInt64_1 (alias b)
     TableJoin
