advancedxy commented on code in PR #206:
URL:
https://github.com/apache/arrow-datafusion-comet/pull/206#discussion_r1555975436
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spark/src/main/scala/org/apache/comet/CometSparkSessionExtensions.scala:
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@@ -592,18 +598,26 @@ class CometSparkSessionExtensions
}
}
- // CometExec already wraps a `ColumnarToRowExec` for row-based operators.
Therefore,
- // `ColumnarToRowExec` is redundant and can be eliminated.
+ // This rule is responsible for eliminating redundant transitions between
row-based and
+ // columnar-based operators for Comet. Currently, two potential redundant
transitions are:
+ // 1. ColumnarToRowExec at the end of a Spark operator, which is redundant
for Comet operators as
Review Comment:
Nice catch, let me refine this part.
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