Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/13773#discussion_r67621491
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JDBCRelation.scala
---
@@ -52,29 +52,42 @@ private[sql] object JDBCRelation {
* @return an array of partitions with where clause for each partition
*/
def columnPartition(partitioning: JDBCPartitioningInfo):
Array[Partition] = {
- if (partitioning == null) return Array[Partition](JDBCPartition(null,
0))
+ if (partitioning == null || partitioning.numPartitions <= 1 ||
+ partitioning.lowerBound == partitioning.upperBound) {
+ return Array[Partition](JDBCPartition(null, 0))
+ }
- val numPartitions = partitioning.numPartitions
+ val lowerBound = partitioning.lowerBound
+ val upperBound = partitioning.upperBound
+ if (lowerBound > upperBound) {
+ throw new IllegalArgumentException("Operation not allowed: the lower
bound of partitioning " +
--- End diff --
Use `require`
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