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From "Alexandre Gaudencio (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4210) Support for variadic parameters list for "in clause" in prepared cql query
Date Fri, 14 Nov 2014 11:41:35 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14212173#comment-14212173
] 

Alexandre Gaudencio commented on CASSANDRA-4210:
------------------------------------------------

I would like to add that using variadic params for IN has different effects depending on the
prepare option.

I am using the nodejs driver.

With this query :
{code:javascript}
var query = 'SELECT * FROM event WHERE id IN (?)'
var params = [ '139a42b0-6bef-11e4-b6d6-0582c8632278,02203b20-6bef-11e4-a5a2-95978cb98ca6']

cql.execute(query, params, function (err, result) {
	if (err) {
		console.log(err)
	} else {
		console.log(result);
	}
})
{code}

I get the result :
{code:none}
{ [ResponseError: UUID should be 16 or 0 bytes (369)]
  name: 'ResponseError',
  message: 'UUID should be 16 or 0 bytes (369)',
  info: 'Represents an error message from the server',
  code: 8704,
  query: 'SELECT * FROM event WHERE id IN (?)' }
{code}

Whereas with a prepared statement, it goes like this :

{code:javascript}
var query = 'SELECT * FROM event WHERE id IN (?)'
var params = [ '139a42b0-6bef-11e4-b6d6-0582c8632278,02203b20-6bef-11e4-a5a2-95978cb98ca6']

cql.execute(query, params, { prepare : true } , function (err, result) {
	if (err) {
		console.log(err)
	} else {
		console.log(result);
	}
})
{code}

{code:none}
{ rows:
   [ { __columns: [Object],
       id: '139a42b0-6bef-11e4-b6d6-0582c8632278',
       name: someName,
       type: 'someType',
       value: '{"id":"someId"}' } ],
  meta:
   { global_tables_spec: true,
     keyspace: 'someKeyspace',
     table: 'event',
     columns:
      [ [Object],
        [Object],
        [Object],
        [Object],
        _col_id: 0,
        _col_name: 1,
        _col_type: 2,
        _col_value: 3 ] },
  _queriedHost: 'xxx.xxx.xxx.xxx' }
{code}

The behavior is inconsistent. 
In the first case I don't any result but an error instead stating that (as I understand it)
the parser only excepted one UUID parameter and the received arg is too long.
In the second case, the query is ran without a problem except for the fact that only the first
UUID is considered, the rest being ditched. And no error has been emitted. (This query should
have returned two rows)

> Support for variadic parameters list for "in clause" in prepared cql query
> --------------------------------------------------------------------------
>
>                 Key: CASSANDRA-4210
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4210
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 1.1.0
>         Environment: prepared cql queries
>            Reporter: Pierre Chalamet
>            Assignee: Sylvain Lebresne
>            Priority: Minor
>             Fix For: 2.0.1
>
>         Attachments: 4210.txt
>
>
> This query
> {code}
> select * from Town where key in (?)
> {code}
> only allows one parameter for '?'.
> This means querying for 'Paris' and 'London' can't be executed in one step with this
prepared statement.
> Current workarounds are:
> * either execute the prepared query 2 times with 'Paris' then 'London'
> * or prepare a new query {{select * from Town where key in (?, ?)}} and bind the 2 parameters
> Having a support for variadic parameters list with in clause could improve performance:
> * single hop to get the data
> * // fetching server side



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