Github user jinfengni commented on a diff in the pull request:
https://github.com/apache/drill/pull/705#discussion_r94443444
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillMergeProjectRule.java
---
@@ -48,6 +50,12 @@ public boolean matches(RelOptRuleCall call) {
Project topProject = call.rel(0);
Project bottomProject = call.rel(1);
+ // Make sure both projects be LogicalProject.
+ if (topProject.getTraitSet().getTrait(ConventionTraitDef.INSTANCE) !=
Convention.NONE ||
--- End diff --
You are right that the current Drill specific MergeProjectRule extends from
Calcite's version and the only difference is to check complex output
expression. Therefore, it make senses the currently Drill MergeProjectRule
operates on Calcite logical convention only.
Yes, in the future, we would consider allowing merging 2 DrillProjectRels.
That should be another instance of rule, which operates on DRILL_LOGICAL
convention only.
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