xy2953396112 opened a new pull request #1550: [CALCITE-3467] Fix PartialMapping#getSourceCount URL: https://github.com/apache/calcite/pull/1550 a small contribution notice this PR: https://github.com/apache/calcite/commit/08dfd170ae91162ffb082f48c4186952955a73d2 there is remain some changes.I'm not sure if it can be a PR,maybe not. mistake: 
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