Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17093#discussion_r103532597
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/PartitioningAwareFileIndex.scala
---
@@ -300,7 +300,8 @@ object PartitioningAwareFileIndex extends Logging {
sparkSession: SparkSession): Seq[(Path, Seq[FileStatus])] = {
// Short-circuits parallel listing when serial listing is likely to be
faster.
- if (paths.size <
sparkSession.sessionState.conf.parallelPartitionDiscoveryThreshold) {
--- End diff --
why not we just make sure `parallelPartitionDiscoveryThreshold` is greater
than 0? We can add a condition(via `checkValue`) in
`SQLConf.PARALLEL_PARTITION_DISCOVERY_THRESHOLD`
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