dongjoon-hyun 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_r263159203
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
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@@ -1540,8 +1540,8 @@ 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 are
the data sources " +
Review comment:
Shall we specify `ORC v1` instead of `ORC` because `ORC` means V2 by default
in Spark 3.0.0.
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