xy2953396112 opened a new pull request #1734: [CALCITE-3262] Refine doc of SubstitutionVisitor (dz) URL: https://github.com/apache/calcite/pull/1734 Before this pr, JIRA: https://issues.apache.org/jira/browse/CALCITE-3262 refine the doc. this pr refine doc for `Calc`、`Intersect`、`Sort` relational operators in SubstitutionVisitor.
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