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https://issues.apache.org/jira/browse/CASSANDRA-5489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13646541#comment-13646541
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Aleksey Yeschenko commented on CASSANDRA-5489:
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Yep.
> Fix 2.0 key and column aliases serialization and cqlsh DESC SCHEMA
> ------------------------------------------------------------------
>
> Key: CASSANDRA-5489
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5489
> Project: Cassandra
> Issue Type: Bug
> Components: Core, Tools
> Affects Versions: 2.0
> Reporter: Aleksey Yeschenko
> Assignee: Sylvain Lebresne
> Priority: Minor
> Fix For: 2.0
>
> Attachments: 5489-1.2.txt, 5489.txt
>
>
> CASSANDRA-5125 made a slight change to how key_aliases and column_aliases are
> serialized in schema. Prior to that we never kept nulls in the the json
> pseudo-lists. This does break cqlsh and probably breaks 1.2 nodes receiving
> such migrations as well. The patch reverts this behavior and also slightly
> modifies cqlsh itself to ignore non-regular columns from
> system.schema_columns table.
> This patch breaks nothing, since 2.0 already handles 1.2 non-null padded
> alias lists.
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