xufei

support regular expression related functions

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## Feature Request **Is your feature request related to a problem? Please describe:** **Describe the feature you'd like:** From MySQL 8.0, more [regular expression](https://dev.mysql.com/doc/refman/8.0/en/regexp.html) function is supported, I would like...

update tiflash function pushdown list to add `power`

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### First-time contributors' checklist - [x] I've signed [**Contributor License Agreement**](https://cla-assistant.io/pingcap/docs-cn) that's required for repo owners to accept my contribution. ### What is changed, added or deleted? (Required) ### Which...

executor: refine executor code

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### What problem does this PR solve? Issue Number: close #52903 Problem Summary: ### What changed and how does it work? - move join exec related code to tidb/pkg/executor/join -...

executor: Refine partition number in hash join v2

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### What problem does this PR solve? Issue Number: ref #53127 Problem Summary: Current, we dispatch row to each partition by the LSB bits in hash value https://github.com/pingcap/tidb/blob/31c1de0b4f30d708de8228aa72c1a0dbff547504/pkg/executor/join/join_row_table.go#L540 And in...

executor: introduce tag pointer in hash join v2

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### What problem does this PR solve? Issue Number: ref #53127 Problem Summary: ### What changed and how does it work? This pr add tagged pointer in hash join v2....

add docs for TiFlash mintso scheduler

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### First-time contributors' checklist - [x] I've signed [**Contributor License Agreement**](https://cla-assistant.io/pingcap/docs-cn) that's required for repo owners to accept my contribution. ### What is changed, added or deleted? (Required) ### Which...

insert into timestamp column with daylight saving affected time generate different results from MySQL

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## Bug Report Please answer these questions before submitting your issue. Thanks! ### 1. Minimal reproduce step (Required) > Note timestamp value is inserted under ` Asia/Shanghai` timezone ``` mysql>...

## Bug Report Please answer these questions before submitting your issue. Thanks! ### 1. Minimal reproduce step (Required) In TiDB ``` mysql> select round(119.00000000*41.18903250000*0.1402072262804424940061410765110833812375,2); +---------------------------------------------------------------------------------+ | round(119.00000000*41.18903250000*0.1402072262804424940061410765110833812375,2) | +---------------------------------------------------------------------------------+ |...

Add `tryGetBypassLock` and refine `resolveLocks`

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1. add `tryGetBypassLock` which check the txn status, and return the txn that can be bypassed for the caller 2. refine `resolveLocks` to not clear `pushed` even if error happens...