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https://issues.apache.org/jira/browse/CASSANDRA-11442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15213348#comment-15213348
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Joel Knighton commented on CASSANDRA-11442:
-------------------------------------------
This looks like a duplicate of [CASSANDRA-11331] to me, which is already in
"Patch Available" status.
> `IF NOT EXISTS` doesn't work for `CREATE INDEX` queries when index name is
> not specified
> ----------------------------------------------------------------------------------------
>
> Key: CASSANDRA-11442
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11442
> Project: Cassandra
> Issue Type: Bug
> Reporter: Alex Petrov
> Priority: Trivial
> Fix For: 3.x
>
> Attachments:
> 0001-Make-IF-NOT-EXISTS-clause-work-on-index-creation-whe.patch
>
>
> `IF NOT EXISTS` doesn't work for `CREATE INDEX` queries when index name is
> not specified. So executing {{CREATE INDEX IF NOT EXISTS ON %s(c)}} twice
> would cause
> {code}
> Caused by: org.apache.cassandra.exceptions.InvalidRequestException: Index
> table_0_c_idx_1 is a duplicate of existing index table_0_c_idx
> at
> org.apache.cassandra.cql3.statements.RequestValidations.invalidRequest(RequestValidations.java:199)
> at
> org.apache.cassandra.cql3.statements.RequestValidations.checkTrue(RequestValidations.java:63)
> at
> org.apache.cassandra.cql3.statements.RequestValidations.checkFalse(RequestValidations.java:111)
> at
> org.apache.cassandra.cql3.statements.CreateIndexStatement.announceMigration(CreateIndexStatement.java:225)
> at
> org.apache.cassandra.cql3.statements.SchemaAlteringStatement.executeInternal(SchemaAlteringStatement.java:120)
> at org.apache.cassandra.cql3.CQLTester.schemaChange(CQLTester.java:637)
> ... 29 more
> {code}
> Patch is attached.
> If it helps, I've also created a branch:
> https://github.com/ifesdjeen/cassandra/tree/11442-trunk
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