zjureel commented on code in PR #418:
URL: https://github.com/apache/flink-table-store/pull/418#discussion_r1038979729
##
flink-table-store-core/src/main/java/org/apache/flink/table/store/file/utils/RecordReaderUtils.java:
##
@@ -44,4 +45,49 @@ public static void forEachRemaining(
reader.close();
}
}
+
+/**
+ * Returns a {@link RecordReader} that applies {@code function} to each
element of {@code
+ * fromReader}.
+ */
+public static RecordReader transform(
+RecordReader fromReader, Function function) {
+return new RecordReader() {
+@Override
+public RecordIterator readBatch() throws IOException {
+RecordIterator iterator = fromReader.readBatch();
+if (iterator == null) {
+return null;
+}
+return transform(iterator, function);
+}
+
+@Override
+public void close() throws IOException {
+fromReader.close();
+}
+};
+}
+
+/**
+ * Returns an iterator that applies {@code function} to each element of
{@code fromIterator}.
+ */
+public static RecordReader.RecordIterator transform(
+RecordReader.RecordIterator fromIterator, Function
function) {
+return new RecordReader.RecordIterator() {
+@Override
+public R next() throws IOException {
Review Comment:
Add @Nullable
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