Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/21608#discussion_r207017248
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
@@ -1449,6 +1449,13 @@ object SQLConf {
.intConf
.checkValues((1 to 9).toSet + Deflater.DEFAULT_COMPRESSION)
.createWithDefault(Deflater.DEFAULT_COMPRESSION)
+
+ val COMPUTE_STATS_LIST_FILES_IN_PARALLEL =
+ buildConf("spark.sql.execution.computeStatsListFilesInParallel")
+ .internal()
+ .doc("If True, File listing for compute statistics is done in
parallel.")
--- End diff --
When true, SQL commands use parallel file listing, as opposed to single
thread listing. This usually speeds up commands that need to list many
directories.
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