gatorsmile commented on a change in pull request #23943: [SPARK-27034][SQL]
Nested schema pruning for ORC
URL: https://github.com/apache/spark/pull/23943#discussion_r358063793
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
##########
@@ -1541,8 +1541,8 @@ object SQLConf {
.internal()
.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 is the only
data source that " +
- "implements this optimization.")
+ "reading unnecessary nested column data. Currently Parquet and ORC v1
are the " +
+ "data sources that implement this optimization.")
.booleanConf
.createWithDefault(false)
Review comment:
@dbtsai @dongjoon-hyun We turned on this flag by default in the upcoming 3.0
because Apple has tried this in the production in the last few months. I am
wondering if that statement also includes ORC nested schema pruning?
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