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| Original file line number | Diff line number | Diff line change |
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| --- | ||
| title: TiDB 6.1.7 Release Notes | ||
| summary: Learn about the improvements and bug fixes in TiDB 6.1.7. | ||
| --- | ||
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| # TiDB 6.1.7 Release Notes | ||
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| Release date: July 12, 2023 | ||
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| TiDB version: 6.1.7 | ||
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| Quick access: [Quick start](https://docs.pingcap.com/tidb/v6.1/quick-start-with-tidb) | [Production deployment](https://docs.pingcap.com/tidb/v6.1/production-deployment-using-tiup) | [Installation packages](https://www.pingcap.com/download/?version=v6.1.7#version-list) | ||
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| ## Improvements | ||
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| + TiDB | ||
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| - Use pessimistic transactions in internal transaction retry to avoid retry failure and reduce time consumption [#38136](https://github.com/pingcap/tidb/issues/38136) @[jackysp](https://github.com/jackysp) | ||
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| + Tools | ||
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| + TiCDC | ||
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| - Support batch `UPDATE` DML statements to improve TiCDC replication performance [#8084](https://github.com/pingcap/tiflow/issues/8084) @[amyangfei](https://github.com/amyangfei) | ||
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| + TiDB Lightning | ||
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| - Verify checksum through SQL after the import to improve stability of verification [#41941](https://github.com/pingcap/tidb/issues/41941) @[GMHDBJD](https://github.com/GMHDBJD) | ||
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| ## Bug fixes | ||
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| + TiDB | ||
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| - Fix the panic issue caused by empty `processInfo` [#43829](https://github.com/pingcap/tidb/issues/43829) @[zimulala](https://github.com/zimulala) | ||
| - Fix the issue that `resolve lock` might hang when there is a sudden change in PD time [#44822](https://github.com/pingcap/tidb/issues/44822) @[zyguan](https://github.com/zyguan) | ||
| - Fix the issue that queries containing Common Table Expressions (CTEs) might cause insufficient disk space [#44477](https://github.com/pingcap/tidb/issues/44477) @[guo-shaoge](https://github.com/guo-shaoge) | ||
| - Fix the issue that using CTEs and correlated subqueries simultaneously might result in incorrect query results or panic [#44649](https://github.com/pingcap/tidb/issues/44649) [#38170](https://github.com/pingcap/tidb/issues/38170) [#44774](https://github.com/pingcap/tidb/issues/44774) @[winoros](https://github.com/winoros) @[guo-shaoge](https://github.com/guo-shaoge) | ||
| - Fix the issue that the query result of the `SELECT CAST(n AS CHAR)` statement is incorrect when `n` in the statement is a negative number [#44786](https://github.com/pingcap/tidb/issues/44786) @[xhebox](https://github.com/xhebox) | ||
| - Fix the query panic issue of TiDB in certain cases [#40857](https://github.com/pingcap/tidb/issues/40857) @[Dousir9](https://github.com/Dousir9) | ||
| - Fix the issue that SQL compile error logs are not redacted [#41831](https://github.com/pingcap/tidb/issues/41831) @[lance6716](https://github.com/lance6716) | ||
| - Fix the issue that the `SELECT` statement returns an error for a partitioned table if the table partition definition uses the `FLOOR()` function to round a partitioned column [#42323](https://github.com/pingcap/tidb/issues/42323) @[jiyfhust](https://github.com/jiyfhust) | ||
| - Fix the issue that querying partitioned tables might cause errors during Region split [#43144](https://github.com/pingcap/tidb/issues/43144) @[lcwangchao](https://github.com/lcwangchao) | ||
| - Fix the issue of unnecessary memory usage during reading statistical information [#42052](https://github.com/pingcap/tidb/issues/42052) @[xuyifangreeneyes](https://github.com/xuyifangreeneyes) | ||
| - Fix the issue of excessive memory usage after creating a large number of empty partitioned tables [#44308](https://github.com/pingcap/tidb/issues/44308) @[hawkingrei](https://github.com/hawkingrei) | ||
| - Fix the issue that queries might return incorrect results when `tidb_opt_agg_push_down` is enabled [#44795](https://github.com/pingcap/tidb/issues/44795) @[AilinKid](https://github.com/AilinKid) | ||
| - Fix the issue that the join result of common table expressions might be wrong [#38170](https://github.com/pingcap/tidb/issues/38170) @[wjhuang2016](https://github.com/wjhuang2016) | ||
| - Fix the issue that in some rare cases, residual pessimistic locks of pessimistic transactions might affect data correctness when GC resolves locks [#43243](https://github.com/pingcap/tidb/issues/43243) @[MyonKeminta](https://github.com/MyonKeminta) | ||
| - Fix the issue that after a new column is added in the cache table, the value is `NULL` instead of the default value of the column [#42928](https://github.com/pingcap/tidb/issues/42928) @[lqs](https://github.com/lqs) | ||
| - Fix the issue that TiDB returns an error when the corresponding rows in partitioned tables cannot be found in the probe phase of index join [#43686](https://github.com/pingcap/tidb/issues/43686) @[AilinKid](https://github.com/AilinKid) @[mjonss](https://github.com/mjonss) | ||
| - Fix the issue that dropping a database causes slow GC progress [#33069](https://github.com/pingcap/tidb/issues/33069) @[tiancaiamao](https://github.com/tiancaiamao) | ||
| - Fix the issue that data and indexes are inconsistent when the `ON UPDATE` statement does not correctly update the primary key [#44565](https://github.com/pingcap/tidb/issues/44565) @[zyguan](https://github.com/zyguan) | ||
| - Fix the issue that TiCDC might lose some row changes during table renaming [#43338](https://github.com/pingcap/tidb/issues/43338) @[tangenta](https://github.com/tangenta) | ||
| - Fix the behavior issue of Placement Rules in partitioned tables, so that the Placement Rules in deleted partitions can be correctly set and recycled [#44116](https://github.com/pingcap/tidb/issues/44116) @[lcwangchao](https://github.com/lcwangchao) | ||
| - Fix the issue that when `tidb_scatter_region` is enabled, Region does not automatically split after a partition is truncated [#43174](https://github.com/pingcap/tidb/issues/43174) [#43028](https://github.com/pingcap/tidb/issues/43028) | ||
| - Fix the issue of DDL retry caused by write conflict when executing `TRUNCATE TABLE` for partitioned tables with many partitions and TiFlash replicas [#42940](https://github.com/pingcap/tidb/issues/42940) @[mjonss](https://github.com/mjonss) | ||
| - Fix the issue of incorrect execution plans when pushing down window functions to TiFlash [#43922](https://github.com/pingcap/tidb/issues/43922) @[gengliqi](https://github.com/gengliqi) | ||
| - Fix the issue that incorrect results might be returned when using a common table expression (CTE) in statements with non-correlated subqueries [#44051](https://github.com/pingcap/tidb/issues/44051) @[winoros](https://github.com/winoros) | ||
| - Fix the issue that using `memTracker` with cursor fetch causes memory leaks [#44254](https://github.com/pingcap/tidb/issues/44254) @[YangKeao](https://github.com/YangKeao) | ||
| - Fix the issue that the data length in the `QUERY` column of the `INFORMATION_SCHEMA.DDL_JOBS` table might exceed the column definition [#42440](https://github.com/pingcap/tidb/issues/42440) @[tiancaiamao](https://github.com/tiancaiamao) | ||
| - Fix the issue that the `min, max` query result is incorrect [#43805](https://github.com/pingcap/tidb/issues/43805) @[wshwsh12](https://github.com/wshwsh12) | ||
| - Fix the issue that TiDB reports syntax errors when analyzing tables [#43392](https://github.com/pingcap/tidb/issues/43392) @[guo-shaoge](https://github.com/guo-shaoge) | ||
| - Fix the issue that the `SHOW PROCESSLIST` statement cannot display the TxnStart of the transaction of the statement with a long subquery time [#40851](https://github.com/pingcap/tidb/issues/40851) @[crazycs520](https://github.com/crazycs520) | ||
| - Fix the issue of missing table names in the `ADMIN SHOW DDL JOBS` result when a `DROP TABLE` operation is being executed [#42268](https://github.com/pingcap/tidb/issues/42268) @[tiancaiamao](https://github.com/tiancaiamao) | ||
| - Fix the issue of displaying the incorrect TiDB address in IPv6 environment [#43260](https://github.com/pingcap/tidb/issues/43260) @[nexustar](https://github.com/nexustar) | ||
| - Fix the issue that the SQL statement reports the `runtime error: index out of range` error when using the `AES_DECRYPT` expression [#43063](https://github.com/pingcap/tidb/issues/43063) @[lcwangchao](https://github.com/lcwangchao) | ||
| - Fix the issue that there is no warning when using `SUBPARTITION` to create partitioned tables [#41198](https://github.com/pingcap/tidb/issues/41198) [#41200](https://github.com/pingcap/tidb/issues/41200) @[mjonss](https://github.com/mjonss) | ||
| - Fix the issue that the query with CTE causes TiDB to hang [#43749](https://github.com/pingcap/tidb/issues/43749) [#36896](https://github.com/pingcap/tidb/issues/36896) @[guo-shaoge](https://github.com/guo-shaoge) | ||
| - Fix the issue that truncating a partition of a partitioned table might cause the Placement Rule of the partition to become invalid [#44031](https://github.com/pingcap/tidb/issues/44031) @[lcwangchao](https://github.com/lcwangchao) | ||
| - Fix the issue that CTE results are incorrect when pushing down predicates [#43645](https://github.com/pingcap/tidb/issues/43645) @[winoros](https://github.com/winoros) | ||
| - Fix the issue that `auto-commit` change affects transaction commit behaviours [#36581](https://github.com/pingcap/tidb/issues/36581) @[cfzjywxk](https://github.com/cfzjywxk) | ||
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| + TiKV | ||
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| - Fix the issue that TiDB Lightning might cause SST file leakage [#14745](https://github.com/tikv/tikv/issues/14745) @[YuJuncen](https://github.com/YuJuncen) | ||
| - Fix the issue that encryption key ID conflict might cause the deletion of the old keys [#14585](https://github.com/tikv/tikv/issues/14585) @[tabokie](https://github.com/tabokie) | ||
| - Fix the issue of file handle leakage in Continuous Profiling [#14224](https://github.com/tikv/tikv/issues/14224) @[tabokie](https://github.com/tabokie) | ||
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| + PD | ||
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| - Fix the issue that gRPC returns errors with unexpected formats [#5161](https://github.com/tikv/pd/issues/5161) @[HuSharp](https://github.com/HuSharp) | ||
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| + Tools | ||
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| + Backup & Restore (BR) | ||
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| - Fix the issue that `resolved lock timeout` is falsely reported in some cases [#43236](https://github.com/pingcap/tidb/issues/43236) @[YuJuncen](https://github.com/YuJuncen) | ||
| - Fix the issue of backup slowdown when a TiKV node crashes in a cluster [#42973](https://github.com/pingcap/tidb/issues/42973) @[YuJuncen](https://github.com/YuJuncen) | ||
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| + TiCDC | ||
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| - Fix the issue that TiCDC cannot create a changefeed with a downstream Kafka-on-Pulsar [#8892](https://github.com/pingcap/tiflow/issues/8892) @[hi-rustin](https://github.com/hi-rustin) | ||
| - Fix the issue that TiCDC cannot automatically recover when PD address or leader fails [#8812](https://github.com/pingcap/tiflow/issues/8812) [#8877](https://github.com/pingcap/tiflow/issues/8877) @[asddongmen](https://github.com/asddongmen) | ||
| - Fix the issue that when the downstream is Kafka, TiCDC queries the downstream metadata too frequently and causes excessive workload in the downstream [#8957](https://github.com/pingcap/tiflow/issues/8957) [#8959](https://github.com/pingcap/tiflow/issues/8959) @[hi-rustin](https://github.com/hi-rustin) | ||
| - Fix the issue that TiCDC gets stuck when PD fails such as network isolation or PD Owner node reboot [#8808](https://github.com/pingcap/tiflow/issues/8808) [#8812](https://github.com/pingcap/tiflow/issues/8812) [#8877](https://github.com/pingcap/tiflow/issues/8877) @[asddongmen](https://github.com/asddongmen) | ||
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| + TiDB Lightning | ||
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| - Fix the issue that in Logical Import Mode, deleting tables downstream during import might cause TiDB Lightning metadata not to be updated in time [#44614](https://github.com/pingcap/tidb/issues/44614) @[dsdashun](https://github.com/dsdashun) | ||
| - Fix the issue that disk quota might be inaccurate due to competing conditions [#44867](https://github.com/pingcap/tidb/issues/44867) @[D3Hunter](https://github.com/D3Hunter) | ||
| - Fix the issue of `write to tikv with no leader returned` when importing a large amount of data [#43055](https://github.com/pingcap/tidb/issues/43055) @[lance6716](https://github.com/lance6716) | ||
| - Fix a possible OOM problem when there is an unclosed delimiter in the data file [#40400](https://github.com/pingcap/tidb/issues/40400) @[buchuitoudegou](https://github.com/buchuitoudegou) | ||
| - Fix the issue that OOM might occur when importing a wide table [#43728](https://github.com/pingcap/tidb/issues/43728) @[D3Hunter](https://github.com/D3Hunter) | ||
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| + TiDB Binlog | ||
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| - Fix the issue that the etcd client does not automatically synchronize the latest node information during initialization [#1236](https://github.com/pingcap/tidb-binlog/issues/1236) @[lichunzhu](https://github.com/lichunzhu) | ||
| - Fix the panic issue of Drainer due to an old TiKV client version by upgrading the TiKV client [#1170](https://github.com/pingcap/tidb-binlog/issues/1170) @[lichunzhu](https://github.com/lichunzhu) | ||
| - Fix the issue that unfiltered failed DDL statements cause task errors [#1228](https://github.com/pingcap/tidb-binlog/issues/1228) @[lichunzhu](https://github.com/lichunzhu) |
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