Address comments.

Author: dongjoon-hyun

sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcRelationProvider.scala

@@ -35,7 +35,8 @@ class JdbcRelationProvider extends CreatableRelationProvider
     val upperBound = jdbcOptions.upperBound
     val numPartitions = jdbcOptions.numPartitions
 
-    val partitionInfo = if (partitionColumn == null) {
+    val partitionInfo = if (partitionColumn == null || lowerBound == null || upperBound == null ||
+        numPartitions.isEmpty) {
       null
     } else {
       JDBCPartitioningInfo(