Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/4036#discussion_r119464746
--- Diff:
flink-connectors/flink-jdbc/src/main/java/org/apache/flink/api/java/io/jdbc/JDBCInputFormat.java
---
@@ -378,6 +388,11 @@ public JDBCInputFormatBuilder
setRowTypeInfo(RowTypeInfo rowTypeInfo) {
return this;
}
+ public JDBCInputFormatBuilder setFetchSize(int fetchSize) {
+ format.fetchSize = fetchSize;
--- End diff --
let's add a `Preconditions` check that fetchSize is greater than 0.
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