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Posted to commits@calcite.apache.org by GitBox <gi...@apache.org> on 2020/09/23 16:08:32 UTC

[GitHub] [calcite] julianhyde commented on a change in pull request #2163: [CALCITE-4273] Support get expression lineage for Calc

julianhyde commented on a change in pull request #2163:
URL: https://github.com/apache/calcite/pull/2163#discussion_r493715390



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File path: core/src/main/java/org/apache/calcite/plan/RelOptUtil.java
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@@ -3607,6 +3607,25 @@ public int size() {
     return relBuilder.build();
   }
 
+  /** Explain filtering condition and projections for Calc. */
+  public static Pair<RexNode, List<RexNode>> explainCalc(Calc calc) {

Review comment:
       Maybe put a simple (non-trivial) example in the javadoc. Expressions, common sub-expressions, filter, some output fields based on constants, some input fields pruned from the output.




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