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tidb/executor
Kenan Yao 6064d6482f plan: propagate constant over outer join (#7794)
- extract `outerCol = const` from join conditions and filter conditions,
  substitute `outerCol` in join conditions with `const`;
- extract `outerCol = innerCol` from join conditions, derive new join
  conditions based on this column equal condition and `outerCol` related
  expressions in join conditions and filter conditions;
2018-10-16 14:54:09 +08:00
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