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https://issues.apache.org/jira/browse/CASSANDRA-16916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17501125#comment-17501125
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Jogesh Anand commented on CASSANDRA-16916:
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[~e.dimitrova] - No worries at all. I didn't know I could update the ticket
status, thought reviewers/committers change that status. Will do so next time
onwards. Sorry about that
I can re-base this weekend so if you decide to run CI it's up-to-date. Let me
know how you would like. thanks again!
> Add support for IF EXISTS and IF NOT EXISTS in ALTER statements
> ---------------------------------------------------------------
>
> Key: CASSANDRA-16916
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16916
> Project: Cassandra
> Issue Type: Improvement
> Components: CQL/Syntax
> Reporter: Benjamin Lerer
> Assignee: Jogesh Anand
> Priority: Normal
> Fix For: 4.x
>
>
> It would make sense to add support for {{IF EXISTS}} and {{IF NOT EXISTS}} in
> the different {{ALTER}} statements.
> For example:
> * {{ALTER TABLE IF EXISTS myTable ...}}
> * {{ALTER TABLE myTable ADD IF NOT EXISTS ...}}
> * {{ALTER TABLE myTable DROP IF EXISTS ...}}
> * {{ALTER TYPE IF EXISTS myType ...}}
> * {{ALTER TYPE myType ADD IF NOT EXISTS ...}}
> +Additional info for newcomers:+
> In order to implement this change you will need to change the {{Parser.g}}
> ANTLR file located in the src/antlr directory and the java classes
> corresponding to the different alter statements located in the
> {{org.apache.cassandra.cql3.statements.schema}} package. You can look at the
> CreateTableStatement class to see how it was done there.
> The unit test for the CQL logic are located under
> {{org.apache.cassandra.cql3.validation}}
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