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Add 5.2.2 CHANGELOG entry 

Many fixes and improvements to existing behavior.
release-5.2
Jason Petersen 2016-11-04 14:12:50 -06:00
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### citus v5.2.2 (November 4, 2016) ###
* Adds support for `IF NOT EXISTS` clause of `CREATE INDEX` command
* Adds support for `RETURN QUERY` and `FOR ... IN` PL/pgSQL features
* Extends the router planner to handle more queries
* Changes `COUNT` of zero-row sets to return `0` rather than an empty result
* Reduces the minimum permitted `task_tracker_delay` to a single millisecond
* Fixes a bug that caused crashes during joins with a `WHERE false` clause
* Fixes a bug triggered by unique violation errors raised in long transactions
* Fixes a bug resulting in multiple registration of transaction callbacks
* Fixes a bug which could result in stale reads of distribution metadata
* Fixes a bug preventing distributed modifications in some PL/pgSQL functions
* Fixes some code paths that could hypothetically read uninitialized memory
* Lowers log level of _waiting for activity_ messages
### citus v5.2.1 (September 6, 2016) ###
* Fixes subquery pushdown to properly extract outer join qualifiers