Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1941#discussion_r62832789
--- Diff:
flink-batch-connectors/flink-jdbc/src/main/java/org/apache/flink/api/java/io/jdbc/JDBCInputFormat.java
---
@@ -157,14 +216,25 @@ public boolean reachedEnd() throws IOException {
* @throws java.io.IOException
*/
@Override
- public OUT nextRecord(OUT tuple) throws IOException {
+ public Row nextRecord(Row row) throws IOException {
try {
- resultSet.next();
- if (columnTypes == null) {
- extractTypes(tuple);
+ hasNext = resultSet.next();
--- End diff --
If `resultSet.next()` was called at the end of `open()` we should call it
again at the end of `nextRecord()`
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