Explain EXPLAIN (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 1)
     Identifier k1
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       Function remote (children 1)
        ExpressionList (children 3)
         Literal \'127.{1,2}\'
         Function view (children 1)
          ExpressionList (children 1)
           SelectWithUnionQuery (children 1)
            ExpressionList (children 1)
             SelectQuery (children 2)
              ExpressionList (children 3)
               Literal UInt64_1 (alias k1)
               Literal UInt64_2 (alias k2)
               Literal UInt64_3 (alias v)
              TablesInSelectQuery (children 1)
               TablesInSelectQueryElement (children 1)
                TableExpression (children 1)
                 Function numbers (children 1)
                  ExpressionList (children 1)
                   Literal UInt64_2
         Function cityHash64 (children 1)
          ExpressionList (children 2)
           Identifier k1
           Identifier k2
    ExpressionList (children 1)
     OrderByElement (children 1)
      Identifier v
