gaurav726 commented on a change in pull request #17754:
URL: https://github.com/apache/flink/pull/17754#discussion_r749902979



##########
File path: 
flink-connectors/flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/table/JdbcRowDataLookupFunction.java
##########
@@ -146,10 +148,12 @@ public void eval(Object... keys) {
         if (cache != null) {
             List<RowData> cachedRows = cache.getIfPresent(keyRow);
             if (cachedRows != null) {
-                for (RowData cachedRow : cachedRows) {
-                    collect(cachedRow);
+                if (!cachedRows.isEmpty() || !excludeEmptyQueryResult) {
+                    for (RowData cachedRow : cachedRows) {

Review comment:
       @wenlong88 , But for this, I need getter for `cache` instance in 
JdbcRowDataLookupFunction, should I add it? I can't test with collector object, 
correct?




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