maropu commented on a change in pull request #28778:
URL: https://github.com/apache/spark/pull/28778#discussion_r438006123
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
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@@ -371,6 +371,14 @@ object SQLConf {
.booleanConf
.createWithDefault(true)
+ val DEFAULT_PARALLELISM = buildConf("spark.sql.default.parallelism")
+ .doc("This config behavior is same as spark.default.parallelism, and this
value can be " +
+ "isolated across sessions. Note: always use sc.defaultParallelism as
default number.")
Review comment:
How about this?
```
The session-local default number of partitions and and this value is widely
used inside physical plans.
If not set, physical plans use `spark.sql.default.parallelism` instead.
```
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