dongjoon-hyun commented on a change in pull request #24637: [SPARK-27707][SQL]
Prune unnecessary nested fields from Generate in explode
URL: https://github.com/apache/spark/pull/24637#discussion_r302276095
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
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@@ -1576,7 +1576,8 @@ object SQLConf {
.doc("Prune nested fields from a logical relation's output which are
unnecessary in " +
"satisfying a query. This optimization allows columnar file format
readers to avoid " +
"reading unnecessary nested column data. Currently Parquet and ORC are
the " +
- "data sources that implement this optimization.")
+ "data sources that implement this optimization. This optimization also
allows pruning " +
+ "unnecessary nested fields in expressions of operator.")
Review comment:
Sorry about asking this. During last review, I realized that this can
disable all the other nested schema pruning features to the users.
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