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Update CHANGELOG for v6.2.0 

CHANGELOG changes for 6.2 release
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Burak Yucesoy 2017-05-16 18:54:29 +03:00 committed by Jason Petersen
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### citus v6.2.0 (May 16, 2017) ###
* Increases SQL subquery coverage by pushing down more kinds of queries
* Adds CustomScan API support to allow read-only transactions
* Adds support for `CREATE/DROP INDEX CONCURRENTLY`
* Adds support for `ALTER TABLE ... ADD CONSTRAINT`
* Adds support for `ALTER TABLE ... RENAME COLUMN`
* Adds support for `DISABLE/ENABLE TRIGGER ALL`
* Adds support for expressions in the partition column in INSERTs
* Adds support for query parameters in combination with function evaluation
* Adds support for creating distributed tables from non-empty local tables
* Adds UDFs to get size of distributed tables
* Adds UDFs to add a new node without replicating reference tables
* Adds checks to prevent running Citus binaries with wrong metadata tables
* Improves shard pruning performance for range queries
* Improves planner performance for joins involving co-located tables
* Improves shard copy performance by creating indexes after copy
* Improves task-tracker performance by batching several status checks
* Enables router planner for queries on range partitioned table
* Changes `TRUNCATE` to drop local data only if `enable_ddl_propagation` is off
* Starts to execute DDL on coordinator before workers
* Fixes a bug causing incorrectly reading invalidated cache
* Fixes a bug related to creation of schemas of in workers with incorrect owner
* Fixes a bug related to concurrent run of shard drop functions
* Fixes a bug related to `EXPLAIN ANALYZE` with DML queries
* Fixes a bug related to SQL functions in FROM clause
* Adds a GUC variable to report cross shard queries
* Fixes a bug related to partition columns without native hash function
* Adds internal infrastructures and tests to improve development process
* Addresses various race conditions and deadlocks
* Improves and standardizes error messages
### citus v6.1.1 (May 5, 2017) ###
* Fixes a crash caused by router executor use after connection timeouts