Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/15975#discussion_r89956633
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcUtils.scala
---
@@ -667,13 +667,13 @@ object JdbcUtils extends Logging {
val getConnection: () => Connection = createConnectionFactory(options)
val batchSize = options.batchSize
val isolationLevel = options.isolationLevel
- val numPartitions = options.numPartitions
- val repartitionedDF =
- if (numPartitions.isDefined && numPartitions.get <
df.rdd.getNumPartitions) {
- df.coalesce(numPartitions.get)
- } else {
- df
- }
+ val repartitionedDF = options.numPartitions match {
+ case Some(n) if n <= 0 => throw new IllegalArgumentException(
--- End diff --
Yeah.
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