CHANGELOG: release notes for v2.1.9 (pingcap#10362)

CHANGELOG.md

@@ -1,6 +1,35 @@
 # TiDB Changelog
 All notable changes to this project will be documented in this file. See also [Release Notes](https://github.com/pingcap/docs/blob/master/releases/rn.md), [TiKV Changelog](https://github.com/tikv/tikv/blob/master/CHANGELOG.md) and [PD Changelog](https://github.com/pingcap/pd/blob/master/CHANGELOG.md).
 
+## [2.1.9] 2019-05-06
+* Fix compatibility of the `MAKETIME` function when unsigned type overflows [#10089](https://github.com/pingcap/tidb/pull/10089)
+* Fix the stack overflow caused by constant folding in some cases [#10189](https://github.com/pingcap/tidb/pull/10189)
+* Fix the privilege check issue for `Update` when an alias exists in some cases [#10157](https://github.com/pingcap/tidb/pull/10157), [#10326](https://github.com/pingcap/tidb/pull/10326)
+* Track and control memory usage in DistSQL [#10197](https://github.com/pingcap/tidb/pull/10197)
+* Support specifying collation as `utf8mb4_0900_ai_ci` [#10201](https://github.com/pingcap/tidb/pull/10201)
+* Fix the wrong result issue of the `MAX` function when the primary key is of the Unsigned type [#10209](https://github.com/pingcap/tidb/pull/10209)
+* Fix the issue that NULL values can be inserted into NOT NULL columns in the non-strict SQL mode [#10254](https://github.com/pingcap/tidb/pull/10254)
+* Fix the wrong result issue of the `COUNT` function when multiple columns exist in `DISTINCT` [#10270](https://github.com/pingcap/tidb/pull/10270)
+* Fix the panic issue occurred when `LOAD DATA` parses irregular CSV files [#10269](https://github.com/pingcap/tidb/pull/10269)
+* Ignore the overflow error when the outer and inner join key types are inconsistent in `Index Lookup Join` [#10244](https://github.com/pingcap/tidb/pull/10244)
+* Fix the issue that a statement is wrongly judged as point-get in some cases [#10299](https://github.com/pingcap/tidb/pull/10299)
+* Fix the wrong result issue when the time type does not convert the time zone in some cases [#10345](https://github.com/pingcap/tidb/pull/10345)
+* Fix the issue that TiDB character set cases are inconsistent in some cases [#10354](https://github.com/pingcap/tidb/pull/10354)
+* Support controlling the number of rows returned by operator [#9166](https://github.com/pingcap/tidb/issues/9166)
+    - `Selection` & `Projection` [#10110](https://github.com/pingcap/tidb/pull/10110)
+    - `StreamAgg` & `HashAgg` [#10133](https://github.com/pingcap/tidb/pull/10133)
+    - `TableReader` & `IndexReader` & `IndexLookup` [#10169](https://github.com/pingcap/tidb/pull/10169)
+* Improve the slow query log:
+    - Add `SQL Digest` to distinguish similar SQL [#10093](https://github.com/pingcap/tidb/pull/10093)
+    - Add version information of statistics used by slow query statements [#10220](https://github.com/pingcap/tidb/pull/10220)
+    - Show memory consumption of a statement in slow query log [#10246](https://github.com/pingcap/tidb/pull/10246)
+    - Adjust the output format of Coprocessor related information so it can be parsed by pt-query-digest [#10300](https://github.com/pingcap/tidb/pull/10300)
+    - Fix the `#` character issue in slow query statements [#10275](https://github.com/pingcap/tidb/pull/10275)
+    - Add some information columns to the memory table of slow query statements  [#10317](https://github.com/pingcap/tidb/pull/10317)
+    - Add the transaction commit time to slow query log [#10310](https://github.com/pingcap/tidb/pull/10310)
+    - Fix the issue some time formats cannot be parsed by pt-query-digest [#10323](https://github.com/pingcap/tidb/pull/10323) 
+
+
 ## [2.1.8] 2019-04-12
 
 * Fix the issue that the processing logic of `GROUP_CONCAT` function is incompatible with MySQL when there is a NULL-valued parameter [#9930](https://github.com/pingcap/tidb/pull/9930)