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From "Carlo Bertuccini (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-7529) IN clause does not work correctly outside the QueryBuilder
Date Wed, 09 Jul 2014 18:03:04 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-7529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Carlo Bertuccini updated CASSANDRA-7529:
----------------------------------------

    Description: 
There is a strange behaviour of the IN clause with lots of keys when used outside a QueryBuilder.
Here is the test I did using the Java Driver 2.0.3 and Cassandra 2.0.7

{code}
CREATE TABLE inlimit (
  key int,
  value text,
  PRIMARY KEY (key)
) 
{code}

I've populated the table with 105000 entries (key from 0 to 104999).
{code}
cqlsh:test> select count(*) from inlimit limit 200000;

 count
--------
 105000
{code}

Here the test:
{code}
String query = "SELECT * FROM inlimit WHERE key IN :key";
PreparedStatement ps = Cassandra.DB.getSession().prepare(query);
BoundStatement bs = new BoundStatement(ps);
List<Integer> l = new ArrayList<>();
for (int i = 0; i < 100000; i++) {
    l.add(i);
}
bs.setList("key", l);
ResultSet rs = Cassandra.DB.getSession().execute(bs);
System.out.println("counted rows: " + rs.all().size());
{code}

Here the output:
{panel}
counted rows: 34464
{panel}

While with QueryBuilder everything changes:

{code}
        List<Integer> l = new ArrayList<>();
        for (int i = 0; i < 100000; i++) {
            l.add(i);
        }
        BuiltStatement bs = QueryBuilder.select().all().from("inlimit").where(in("key", l.toArray()));
        ResultSet rs = Cassandra.DB.getSession().execute(bs);
        System.out.println("counted rows: " + rs.all().size());
{code}

The new output
{panel}
counted rows: 100000
{panel}

BTW: I'd suggest to write somewhere if the IN clause has some limitations cause I found this
question without answer in many forums.

Cheers,
Carlo

  was:
There is a strange behaviour of the IN clause with lots of keys when used outside a QueryBuilder.
Here is the test I did using the Java Driver 2.0.3 and Cassandra 2.0.7

{code}
CREATE TABLE inlimit (
  key int,
  value text,
  PRIMARY KEY (key)
) 
{code}

I've populated the table with 105000 entries (key from 1 to 105000).
{code}
cqlsh:test> select count(*) from inlimit limit 200000;

 count
--------
 105000
{code}

Here the test:
{code}
String query = "SELECT * FROM inlimit WHERE key IN :key";
PreparedStatement ps = Cassandra.DB.getSession().prepare(query);
BoundStatement bs = new BoundStatement(ps);
List<Integer> l = new ArrayList<>();
for (int i = 0; i < 100000; i++) {
    l.add(i);
}
bs.setList("key", l);
ResultSet rs = Cassandra.DB.getSession().execute(bs);
System.out.println("counted rows: " + rs.all().size());
{code}

Here the output:
{panel}
counted rows: 34464
{panel}

While with QueryBuilder everything changes:

{code}
        List<Integer> l = new ArrayList<>();
        for (int i = 0; i < 100000; i++) {
            l.add(i);
        }
        BuiltStatement bs = QueryBuilder.select().all().from("inlimit").where(in("key", l.toArray()));
        ResultSet rs = Cassandra.DB.getSession().execute(bs);
        System.out.println("counted rows: " + rs.all().size());
{code}

The new output
{panel}
counted rows: 100000
{panel}

BTW: I'd suggest to write somewhere if the IN clause has some limitations cause I found this
question without answer in many forums.

Cheers,
Carlo


> IN clause does not work correctly outside the QueryBuilder
> ----------------------------------------------------------
>
>                 Key: CASSANDRA-7529
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7529
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Drivers (now out of tree)
>            Reporter: Carlo Bertuccini
>            Priority: Critical
>              Labels: In, PreparedStatement, QueryBuilder
>
> There is a strange behaviour of the IN clause with lots of keys when used outside a QueryBuilder.
Here is the test I did using the Java Driver 2.0.3 and Cassandra 2.0.7
> {code}
> CREATE TABLE inlimit (
>   key int,
>   value text,
>   PRIMARY KEY (key)
> ) 
> {code}
> I've populated the table with 105000 entries (key from 0 to 104999).
> {code}
> cqlsh:test> select count(*) from inlimit limit 200000;
>  count
> --------
>  105000
> {code}
> Here the test:
> {code}
> String query = "SELECT * FROM inlimit WHERE key IN :key";
> PreparedStatement ps = Cassandra.DB.getSession().prepare(query);
> BoundStatement bs = new BoundStatement(ps);
> List<Integer> l = new ArrayList<>();
> for (int i = 0; i < 100000; i++) {
>     l.add(i);
> }
> bs.setList("key", l);
> ResultSet rs = Cassandra.DB.getSession().execute(bs);
> System.out.println("counted rows: " + rs.all().size());
> {code}
> Here the output:
> {panel}
> counted rows: 34464
> {panel}
> While with QueryBuilder everything changes:
> {code}
>         List<Integer> l = new ArrayList<>();
>         for (int i = 0; i < 100000; i++) {
>             l.add(i);
>         }
>         BuiltStatement bs = QueryBuilder.select().all().from("inlimit").where(in("key",
l.toArray()));
>         ResultSet rs = Cassandra.DB.getSession().execute(bs);
>         System.out.println("counted rows: " + rs.all().size());
> {code}
> The new output
> {panel}
> counted rows: 100000
> {panel}
> BTW: I'd suggest to write somewhere if the IN clause has some limitations cause I found
this question without answer in many forums.
> Cheers,
> Carlo



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