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[SPARK-32820][SQL] Remove redundant shuffle exchanges inserted by EnsureRequirements - #29677

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sarutak wants to merge 10 commits into

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sarutak:remove-redundant-shuffleexchange

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[SPARK-32820][SQL] Remove redundant shuffle exchanges inserted by EnsureRequirements#29677
sarutak wants to merge 10 commits into
apache:masterfrom
sarutak:remove-redundant-shuffleexchange

Commits on Sep 8, 2020
- Changed EnsureRequirements to let it removes redundant shuffle exchanges.
  sarutak
  committed
  840ff97
- Removed a blank line.
  sarutak
  committed
  1effe75
- Added comments.
  sarutak
  committed
  0da9e82
Commits on Sep 11, 2020
- Resolve conflict.
  sarutak
  committed
  1e3216e
- Added JIRA number prefix to the test.
  sarutak
  committed
  5680d48
Commits on Sep 29, 2020
- Merge branch 'master' of https://github.com/apache/spark into remove-redundant-shuffleexchange
  sarutak
  committed
  ebdec14
Commits on Oct 1, 2020
- Added PruneShuffle rule to prune unnecessary shuffles.
  sarutak
  committed
  23c8b70
- Removed unnecessary assertions.
  sarutak
  committed
  e699cb6
Commits on Oct 4, 2020
- Fix a conflict.
  sarutak
  committed
  d6e8cbe
Commits on Oct 28, 2020
- Resolved conflict.
  sarutak
  committed
  95454a2