SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 3)
    Function tuple (children 1)
     ExpressionList (children 14)
      Asterisk
      Literal UInt64_8
      Literal UInt64_8
      Literal UInt64_8
      Function toFixedString (children 1)
       ExpressionList (children 2)
        Literal \'FirstKey\'
        Literal UInt64_8
      Literal UInt64_8
      Literal UInt64_8
      Function isNull (children 1)
       ExpressionList (children 1)
        Function isNotNull (children 1)
         ExpressionList (children 1)
          Function toNullable (children 1)
           ExpressionList (children 1)
            Literal UInt64_8
      Literal UInt64_8
      Function toNullable (children 1)
       ExpressionList (children 1)
        Function toNullable (children 1)
         ExpressionList (children 1)
          Function toNullable (children 1)
           ExpressionList (children 1)
            Literal UInt64_8
      Literal UInt64_8
      Literal UInt64_8
      Literal \'FirstKey\'
      Function isNotNull (children 1)
       ExpressionList (children 1)
        Function isNotNull (children 1)
         ExpressionList (children 1)
          Literal UInt64_8
    Asterisk
    Function plus (alias a) (children 1)
     ExpressionList (children 2)
      Identifier b
      Literal UInt64_1
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tb__fuzz_0
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier tabc__fuzz_21
     TableJoin (children 1)
      ExpressionList (children 1)
       Identifier a
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier ALL
   Set
