tidb: add the join order related variable `tidb_opt_join_reorder_through_sel` (#22477)#22725

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ti-chi-bot[bot] merged 14 commits intopingcap:feature/preview-v8.5.6from

ti-chi-bot:cherry-pick-22477-to-release-8.5

Apr 10, 2026

Commits on Apr 10, 2026

Update system-variables.md

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Merge branch 'feature/preview-v8.5.6' into pr/22725
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revert unrelated doc changes in PR 22725
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Revert "revert unrelated doc changes in PR 22725"
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Revert "Merge branch 'feature/preview-v8.5.6' into pr/22725"
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Reapply "Merge branch 'feature/preview-v8.5.6' into pr/22725"
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revert non-system-variables files in PR 22725
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Merge branch 'feature/preview-v8.5.6' into pr/22725
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keep only system-variables changes in PR 22725
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Update system-variables.md
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