Karl-WangSK commented on a change in pull request #29360:
URL: https://github.com/apache/spark/pull/29360#discussion_r467552369
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
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@@ -2690,6 +2690,18 @@ object SQLConf {
.booleanConf
.createWithDefault(true)
+ val GROUPING_WITH_UNION = buildConf("spark.sql.optimizer.grouping")
+ .doc("When true, enable grouping with union.")
+ .booleanConf
+ .createWithDefault(false)
Review comment:
yes. The default spark.sql.optimizer.projections.size=4,but if your
sql's projections excceed 4,and you still don't want to turn on this function.
you can set spark.sql.optimizer.grouping=false
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