Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/18800#discussion_r130704669
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JDBCRelation.scala
---
@@ -64,7 +64,8 @@ private[sql] object JDBCRelation extends Logging {
s"bound. Lower bound: $lowerBound; Upper bound: $upperBound")
val numPartitions =
- if ((upperBound - lowerBound) >= partitioning.numPartitions) {
+ if ((upperBound - lowerBound) >= partitioning.numPartitions ||
+ (upperBound - lowerBound) < 0) {
--- End diff --
Looks good. for bonus points, add a comment about what this is for, and
indent this line two more spaces
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