SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 3)
    Identifier s1
    Identifier s2
    Function compareSubstrings (children 1)
     ExpressionList (children 5)
      Identifier s1
      Identifier s2
      Literal UInt64_4
      Literal UInt64_4
      Literal UInt64_4
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 2)
           Function CAST (alias s2) (children 1)
            ExpressionList (children 2)
             Identifier s2
             Literal \'FixedString(3)\'
           Function CAST (alias s1) (children 1)
            ExpressionList (children 2)
             Identifier s1
             Literal \'FixedString(3)\'
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Subquery (children 1)
              SelectWithUnionQuery (children 1)
               ExpressionList (children 1)
                SelectQuery (children 2)
                 ExpressionList (children 2)
                  Function concat (alias s1) (children 1)
                   ExpressionList (children 2)
                    Literal \'ab\'
                    Function modulo (children 1)
                     ExpressionList (children 2)
                      Identifier number
                      Literal UInt64_3
                  Function concat (alias s2) (children 1)
                   ExpressionList (children 2)
                    Literal \'ab\'
                    Function modulo (children 1)
                     ExpressionList (children 2)
                      Identifier number
                      Literal UInt64_4
                 TablesInSelectQuery (children 1)
                  TablesInSelectQueryElement (children 1)
                   TableExpression (children 1)
                    Function numbers (children 1)
                     ExpressionList (children 1)
                      Literal UInt64_6
