Github user yueqianzhu commented on a diff in the pull request: https://github.com/apache/spark/pull/9515#discussion_r44112438 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JDBCRDD.scala --- @@ -369,7 +369,7 @@ private[sql] class JDBCRDD( val sqlText = s"SELECT $columnList FROM $fqTable $myWhereClause" val stmt = conn.prepareStatement(sqlText, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY) - val fetchSize = properties.getProperty("fetchsize", "0").toInt + val fetchSize = properties.getProperty("fetchsize", "10").toInt --- End diff -- Yes, my mistake. It's due to null properties object. Is this better to provide a jdbc API like below: def jdbc(url: String, table: String): DataFrame = { jdbc(url, table, new Properties()) } I think "properties" meaning is a non essential,so I always use null to test first time. thanks.
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