Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/11647#discussion_r55872639
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Canonicalize.scala
---
@@ -36,15 +36,16 @@ import org.apache.spark.sql.catalyst.rules._
object Canonicalize extends RuleExecutor[Expression] {
override protected def batches: Seq[Batch] =
Batch(
- "Expression Canonicalization", FixedPoint(100),
+ "Expression Canonicalization", Once,
--- End diff --
Its kind of confusing for this to be a RuleExecutor if we are only going to
run it once and its only doing matches. Should we just move this into
`Expression`?
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