SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function transform (children 1)
     ExpressionList (children 4)
      Function toNullable (children 1)
       ExpressionList (children 1)
        Function toInt256 (children 1)
         ExpressionList (children 1)
          Identifier number
      Literal Array_[UInt64_3, UInt64_5, UInt64_7]
      Literal Array_[\'hello\', \'world\', \'abc\']
      Literal \'\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.numbers
   Literal UInt64_10
