pingcap
system_var, planner: add variable for controlling the algorithm of jo…
…in reorder
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What is changed, added or deleted? (Required)
Add the description for the variable to control the join reorder algo.
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- [x] master (the latest development version)
- [ ] v6.3 (TiDB 6.3 versions)
- [ ] v6.1 (TiDB 6.1 versions)
- [ ] v5.4 (TiDB 5.4 versions)
- [ ] v5.3 (TiDB 5.3 versions)
- [ ] v5.2 (TiDB 5.2 versions)
- [ ] v5.1 (TiDB 5.1 versions)
- [ ] v5.0 (TiDB 5.0 versions)
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- [ ] Delete files
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- [ ] Need modification after applied to another branch
- [ ] Might cause conflicts after applied to another branch
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