SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Identifier t.a
    Identifier u.a
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (alias t) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Literal UInt64_1 (alias a)
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      Subquery (alias u) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 24)
           Asterisk
           Asterisk
           Literal UInt64_27
           Literal \'======Before Truncate======\'
           Function materialize (children 1)
            ExpressionList (children 1)
             Literal UInt64_27
           Literal UInt64_27
           Asterisk
           Function isZeroOrNull (children 1)
            ExpressionList (children 1)
             Literal UInt64_27
           Literal UInt64_27
           Function materialize (children 1)
            ExpressionList (children 1)
             Literal UInt64_27
           Asterisk
           Function isNotNull (children 1)
            ExpressionList (children 1)
             Asterisk
           Asterisk
           Literal UInt64_27
           Asterisk
           Function toFixedString (children 1)
            ExpressionList (children 2)
             Literal \'======Before Truncate======\'
             Literal UInt64_27
           Literal UInt64_27
           Literal UInt64_27
           Literal UInt64_27
           Literal UInt64_27
           Function toLowCardinality (children 1)
            ExpressionList (children 1)
             Literal UInt64_27
           Function toNullable (children 1)
            ExpressionList (children 1)
             Function materialize (children 1)
              ExpressionList (children 1)
               Literal UInt64_27
           Function isNotNull (children 1)
            ExpressionList (children 1)
             Asterisk
           Literal UInt64_1 (alias a)
          Function equals (children 1)
           ExpressionList (children 2)
            Function isNull (children 1)
             ExpressionList (children 1)
              Function tuple (children 1)
               ExpressionList (children 9)
                Asterisk
                Literal UInt64_27
                Function materialize (children 1)
                 ExpressionList (children 1)
                  Literal UInt64_27
                Literal UInt64_27
                Literal \'======Before Truncate======\'
                Literal UInt64_27
                Literal UInt64_27
                Function isNotNull (children 1)
                 ExpressionList (children 1)
                  Literal UInt64_27
                Function isNotNull (children 1)
                 ExpressionList (children 1)
                  Asterisk
            Identifier t.a (alias alias668)
     TableJoin
