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cherry pick pingcap#3465 to release-3.1
Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
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title: TiDB 3.0.17 Release Notes | ||
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# TiDB 3.0.17 Release Notes | ||
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Release date: Aug 3, 2020 | ||
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TiDB version: 3.0.17 | ||
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## Bug Fixes | ||
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+ TiDB | ||
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- Return the actual error message instead of an empty set when a query which contains `IndexHashJoin` or `IndexMergeJoin` encounters a panic [#18498](https://github.com/pingcap/tidb/pull/18498) | ||
- Fix the unknown column error for SQL statements like `SELECT a FROM t HAVING t.a` [#18432](https://github.com/pingcap/tidb/pull/18432) | ||
- Forbid adding a primary key for a table when the table has no primary key or when the table already has an integer primary key [#18342](https://github.com/pingcap/tidb/pull/18342) | ||
- Return an empty set when executing `EXPLAIN FORMAT="dot" FOR CONNECTION` [#17157](https://github.com/pingcap/tidb/pull/17157) | ||
- Fix `STR_TO_DATE`'s handling for format token '%r', '%h' [#18725](https://github.com/pingcap/tidb/pull/18725) | ||
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+ TiKV | ||
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- Fix a bug that might read stale data during region merging [#8111](https://github.com/tikv/tikv/pull/8111) | ||
- Fix the issue of memory leak during the scheduling process [#8355](https://github.com/tikv/tikv/pull/8355) | ||
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+ TiDB Lightning | ||
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- Fix the issue that the `log-file` flag is ignored [#345](https://github.com/pingcap/tidb-lightning/pull/345) | ||
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## Improvements | ||
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+ TiDB | ||
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- Ease the impact of statistics feedback on the cluster [#18770](https://github.com/pingcap/tidb/pull/18770) | ||
- Limit batch split count for one request [#18694](https://github.com/pingcap/tidb/pull/18694) | ||
- Accelerate `/tiflash/replica` HTTP API when there are many history DDL jobs in the TiDB cluster [#18386](https://github.com/pingcap/tidb/pull/18386) | ||
- Improve row count estimation for index equal condition [#17609](https://github.com/pingcap/tidb/pull/17609) | ||
- Speed up the execution of `kill tidb conn_id` [#18506](https://github.com/pingcap/tidb/pull/18506) | ||
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+ TiKV | ||
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- Add the `hibernate-timeout` configuration that delays region hibernation to improve rolling update performance [#8207](https://github.com/tikv/tikv/pull/8207) | ||
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+ TiDB Lightning | ||
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- `[black-white-list]` has been deprecated with a newer, easier-to-understand filter format [#332](https://github.com/pingcap/tidb-lightning/pull/332) |
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