[jira] [Created] (CASSANDRA-5489) Fix 2.0 key and column aliases serialization and cqlsh DESC SCHEMA

["Aleksey Yeschenko (JIRA)" <ji...@apache.org>]

Aleksey Yeschenko created CASSANDRA-5489:
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             Summary: 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: Aleksey Yeschenko
            Priority: Minor
             Fix For: 2.0


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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