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https://issues.apache.org/jira/browse/CASSANDRA-5443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13657471#comment-13657471
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Jonathan Ellis commented on CASSANDRA-5443:
-------------------------------------------
The tracing I see suggests that this is actually executing StorageProxy.mutate
instead of SP.cas:
{noformat}
cqlsh:foo> update bar set j=1 where i=1 if not exists;
activity | timestamp | source | source_elapsed
-----------------------------------+--------------+-----------+----------------
execute_cql3_query | 15:24:50,122 | 127.0.0.1 | 0
Parsing statement | 15:24:50,122 | 127.0.0.1 | 68
Peparing statement | 15:24:50,123 | 127.0.0.1 | 482
Determining replicas for mutation | 15:24:50,123 | 127.0.0.1 | 762
Acquiring switchLock read lock | 15:24:50,124 | 127.0.0.1 | 1790
Appending to commitlog | 15:24:50,124 | 127.0.0.1 | 1815
Adding to bar memtable | 15:24:50,124 | 127.0.0.1 | 1871
Request complete | 15:24:50,124 | 127.0.0.1 | 2246
{noformat}
it's not just the IF EXISTS syntax:
{noformat}
cqlsh:foo> update bar set j=2 where i=1 if j=1;
activity | timestamp | source | source_elapsed
-----------------------------------+--------------+-----------+----------------
execute_cql3_query | 15:25:32,657 | 127.0.0.1 | 0
Parsing statement | 15:25:32,657 | 127.0.0.1 | 47
Peparing statement | 15:25:32,657 | 127.0.0.1 | 306
Determining replicas for mutation | 15:25:32,657 | 127.0.0.1 | 457
Acquiring switchLock read lock | 15:25:32,658 | 127.0.0.1 | 1082
Appending to commitlog | 15:25:32,658 | 127.0.0.1 | 1106
Adding to bar memtable | 15:25:32,658 | 127.0.0.1 | 1163
Request complete | 15:25:32,658 | 127.0.0.1 | 1440
{noformat}
> Add CAS CQL support
> -------------------
>
> Key: CASSANDRA-5443
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5443
> Project: Cassandra
> Issue Type: Sub-task
> Components: API, Core
> Reporter: Jonathan Ellis
> Assignee: Sylvain Lebresne
> Fix For: 2.0
>
> Attachments:
> 0001-Refactor-Update-and-Delete-statement-to-extract-common.txt,
> 0002-Add-syntax-to-support-conditional-update-delete.txt,
> 0003-Handle-deleted-and-expiring-column-in-paxos-updates.txt,
> 0004-Support-tombstones-when-comparing-for-CAS.txt,
> 0005-add-UPDATE-.-IF-NOT-EXISTS-syntax.txt,
> 0006-Make-EXISTS-a-reserverd-keyword.txt
>
>
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