fuwhu commented on a change in pull request #26230: [SPARK-21287][SQL] Move the
validation of fetch size from JDBCOptions to JdbcDialect
URL: https://github.com/apache/spark/pull/26230#discussion_r338402148
##########
File path: sql/core/src/main/scala/org/apache/spark/sql/jdbc/JdbcDialects.scala
##########
@@ -150,6 +151,30 @@ abstract class JdbcDialect extends Serializable {
def beforeFetch(connection: Connection, properties: Map[String, String]):
Unit = {
}
+ /**
+ * Do some extra properties validation work in addition to the validation in
[[JDBCOptions]],
+ * eg. [[validateFetchSize()]].
+ * @param properties The connection properties. This is passed through from
the relation.
+ */
+ def validateProperties(properties: Map[String, String]): Unit = {
+ val fetchSize = properties.getOrElse(JDBCOptions.JDBC_BATCH_FETCH_SIZE,
"0").toInt
+ validateFetchSize(fetchSize)
+ }
+
+ /**
+ * This is to validate the fetch size specified via
[[JDBCOptions.JDBC_BATCH_FETCH_SIZE]].
+ * The implementation here requires the fetch size >= 0, sub classes may
override it to meet
+ * requirement of different dialects.
+ * @param size the fetch size to validate.
+ */
+ protected def validateFetchSize(size: Int): Unit = {
Review comment:
make sense, thanks.
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