Yiding Cui

parser: add explain format for optimizer trace

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### What problem does this PR solve? Add one more new explain format to enable optimizer trace. ### Check List Tests - Unit test

*: let planner decide the col refs for non-partition and non-foreignkey table's delete

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### What problem does this PR solve? Issue Number: ref https://github.com/pingcap/tidb/issues/38911 Problem Summary: ### What changed and how does it work? This pull tries to change the column references of...

statistics: fix the error that init stats might got failure when decoding column bucket

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… ### What problem does this PR solve? Issue Number: close #55684 Problem Summary: ### What changed and how does it work? The old init stats doesn't handle the collation...

Makefile: add gotag for make server_check

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### What problem does this PR solve? Issue Number: close #xxx Problem Summary: ### What changed and how does it work? There's some error check enabled by gotag intest. And...

statistics: remove a old logic related with statistics

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### What problem does this PR solve? Issue Number: close #xxx Problem Summary: The code is introduced by https://github.com/pingcap/tidb/pull/6565/files#diff-5a16cfaf3a94b6aae3fafc2709020d48b95a2dd1857ccfc3d48e08ff3ed73bcaL209. Related with our old feedback logic. This code segment will cause...

statistics: remove one unused var

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### What problem does this PR solve? Issue Number: close #xxx Problem Summary: ### What changed and how does it work? This var only has set-variable operations. ### Check List...

statistics: fix the potential error when merging global stats

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### What problem does this PR solve? Issue Number: close #52251 Problem Summary: It's another way compared with https://github.com/pingcap/tidb/pull/52122. This one should be better to solve problems. ### What changed...

## Enhancement If we get an expression like `col > cor_col`, we'll apply index full scan and fail to build ranges with this expression.

## Enhancement We support constructing index ranges with correlated columns. But only support the most simple case `col op cor_col`. But we'll fail to do it when the correlated column...

as the title said