viirya commented on a change in pull request #29950:
URL: https://github.com/apache/spark/pull/29950#discussion_r509035787
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
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@@ -1926,6 +1926,23 @@ object SQLConf {
.booleanConf
.createWithDefault(true)
+ val MAX_COMMON_EXPRS_IN_COLLAPSE_PROJECT =
+ buildConf("spark.sql.optimizer.maxCommonExprsInCollapseProject")
+ .doc("An integer number indicates the maximum allowed number of common
input expression " +
+ "from lower Project when being collapsed into upper Project by
optimizer rule " +
+ "`CollapseProject`. Normally `CollapseProject` will collapse adjacent
Project " +
Review comment:
Yeah, but currently if we exclude `CollapseProject`, `ScanOperation`
will work and collapse projections. Maybe update this doc?
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