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https://issues.apache.org/jira/browse/CASSANDRA-15303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17063506#comment-17063506
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Alex Petrov commented on CASSANDRA-15303:
-----------------------------------------

This commit has broken AlterTest. I've ninja-commited the fix for trunk here 
[b29af2925cddacb4ab8b429b31917748781fbe5d|https://github.com/apache/cassandra/commit/b29af2925cddacb4ab8b429b31917748781fbe5d]

> drop column statement should not initialize timestamp because of statement 
> cache
> --------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-15303
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15303
>             Project: Cassandra
>          Issue Type: Bug
>          Components: CQL/Interpreter
>            Reporter: ZhaoYang
>            Assignee: ZhaoYang
>            Priority: Normal
>             Fix For: 4.0
>
>
> When executing drop-column query without timestamp, 
> {{AlterTableStatement#Raw}} initializes a default timestamp and then the 
> prepared statement is cached. The same timestamp will be reused for the same 
> drop-column query.  (related to CASSANDRA-13426)
>  
> The fix is to use NULL timestamp to indicate: using statement execution time 
> instead.
>  
> patch: 
> [https://github.com/jasonstack/cassandra/commits/fix-drop-column-timestamp]



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