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https://issues.apache.org/jira/browse/CASSANDRA-16916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17863020#comment-17863020
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Stefan Miklosovic edited comment on CASSANDRA-16916 at 7/4/24 12:20 PM:
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[~bereng] [~blerer]
I think this feature was broken on delivery. I think we did a pretty poor job
while testing it as CASSANDRA-19749 shows.
this code:
[https://github.com/apache/cassandra/commit/e137c7c34cc10d4f8c9124c6f9af17a44061ab1f#diff-9c7fbde9c5b432f9ce35424491d70e572567712cdfe08f048d5278bb9460223d]
IF you notice, it just tests the syntax when it comes to roles / users. It is
actually never testing the functionality itself which CASSANDRA-19749
discovered.
was (Author: smiklosovic):
[~bereng] [~blerer]
I think this feature was broken on delivery. I think we did a pretty poor job
while testing it as CASSANDRA-19749 shows.
this code:
[https://github.com/apache/cassandra/commit/e137c7c34cc10d4f8c9124c6f9af17a44061ab1f#diff-9c7fbde9c5b432f9ce35424491d70e572567712cdfe08f048d5278bb9460223d]
IF you notice, it just tests the syntax when it comes to roles / users. It is
actually never testing the functionality itself which CASSANDRA_19749
discovered.
> 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: 4.1-alpha1, 4.1
>
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> 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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