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[DNM] *: Enable tiflash_fastscan variable and remove fast mode alter statment

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### What problem does this PR solve? Issue Number: ref #35850 Problem Summary: 1. remove the code related to the ddl 'alter table xx set tiflash mode fast/normal'. 2. add...

hongyunyan

Planner: variable control for CTE inline

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### What problem does this PR solve? Issue Number: close #36514 Problem Summary: We set a system variable to control whether to inline CTE or not. Variable name: `tidb_opt_inline_cte` ###...

dayicklp

## Enhancement We can only use `show variables like 'tidb_current_ts'` to retrive current tso, can we add scalar function like `current_tso()` for common use.

AndrewDi

executor, util: fix UnionScan Next() skip reading data when passed chunk capacity is 0

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### What problem does this PR solve? Issue Number: close #36903 Problem Summary: ### What is changed and how it works? **In the old UnionScan executor code, if an empty...

tiancaiamao

*: support foreign key constrain

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### What problem does this PR solve? Issue Number: close #xxx Problem Summary: ### What is changed and how it works? ### Check List Tests - [ ] Unit test...

crazycs520

## Enhancement When doing br PiTR restore, user specifies --full-backup-storage for snapshot backup, and --storage for log backup, in this case start-ts is the backupts of the snapshot backup. Currently...

fubinzh

## Bug Report Please answer these questions before submitting your issue. Thanks! ### 1. Minimal reproduce step (Required) 1. Do a br restore, and check restore summary ### 2. What...

fubinzh

## Bug Report Please answer these questions before submitting your issue. Thanks! ### 1. Minimal reproduce step (Required) ``` === RUN TestFailBusyServerCop fatal error: runtime·lock: lock count runtime stack: runtime.throw({0x3ff197f?,...

hawkingrei

Region is not distributed after plug a new server

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Hi all, I have a problem related to distribution data in the cluster after i plugged new servers into the current cluster. I have two datacenter in one city. Firstly,...

phamtai97

Unique key lock not consistent when row is changed or not

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## Bug Report Please answer these questions before submitting your issue. Thanks! ### 1. Minimal reproduce step (Required) ``` mysql> show create table t; +-------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Table | Create Table...

jackysp