Yiding Cui

planner: support push part of order property down to the partition table

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### What problem does this PR solve? Issue Number: ref #26166 (a quick solution) Problem Summary: The partition table shields the partition information in the execution phase. So we cannot...

statistics: add the note for OOM of the version 2 stats

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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) The version...

optimizer hints: add notes for how to specify the table name in hints

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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) It's a...

statistics: add some doc for the exp feature

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

## Bug Report Please answer these questions before submitting your issue. Thanks! ### 1. Minimal reproduce step (Required) The global transaction is optimistic. ### 2. What did you expect to...

system_var, planner: add variable for controlling the algorithm of jo…

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…in reorder ### 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)...

planner, stats: reduce the persist memory usage of stats after startup

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### What problem does this PR solve? Issue Number: close https://github.com/pingcap/tidb/issues/46867 Problem Summary: We've introduced lite init before. Only load the metadata(NDV, NULL count etc) of the column/index's statistics. But...

statistics: use another way to merge topn

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### What problem does this PR solve? Issue Number: ref #50761 Problem Summary: ### What is changed and how it works? We use the property that items inside both the...

for debugging image

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

parser: add sample rate for analyze option

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### What problem does this PR solve? Add new option `SAMPLERATE` to support collect samples by sample rate for statistics ### What is changed and how it works? Add new...