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https://issues.apache.org/jira/browse/CASSANDRA-1480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12908875#action_12908875
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Jonathan Ellis commented on CASSANDRA-1480:
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This is not a bug; subcomparator_type has a default of "", so if you leave it
null (i.e., unspecified), it gets changed to its default.
Removing the default should restore the old behavior.
Defaults on reconciler and comment should also be removed.
> CFMetaData.convertToThrift makes subcomparator_type empty string instead of
> null
> --------------------------------------------------------------------------------
>
> Key: CASSANDRA-1480
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1480
> Project: Cassandra
> Issue Type: Bug
> Components: API
> Affects Versions: 0.7 beta 1
> Reporter: Jeremy Hanna
> Assignee: Jon Hermes
> Fix For: 0.7 beta 2
>
>
> As a result of CASSANDRA-891 adding a CFMetaData.convertToThrift method, the
> values such as subcomparator_type are defaulted to empty string instead of
> null. That makes it so, for example, in ColumnFamilyRecordReader, in its
> RowIterator, the check for only null is insufficient. It also needs to check
> for a blank value.
> After a discussion about it in IRC, Jonathan said it was probably easier to
> just change the creation to give a null value instead of empty string.
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