twalthr commented on code in PR #27929:
URL: https://github.com/apache/flink/pull/27929#discussion_r3086004075
##########
flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/api/PartitionedTable.java:
##########
@@ -35,6 +36,36 @@
@PublicEvolving
public interface PartitionedTable {
+ /**
+ * Sorts the partitioned table within each partition.
+ *
+ * <p>This is useful for process table functions that need ordered input
within each set scoped
+ * by the key.
+ *
+ * <p>Note: The first sorting column must be a time attribute column in
ascending order for
+ * which a watermark has been declared. The watermarked column must be
forwarded without any
+ * modification to ensure event-time sorting. Secondary ordering columns
can differ and are used
+ * for deterministic ordering within the same timestamp.
+ *
+ * <p>Example:
+ *
+ * <pre>{@code
+ * // Primary ordering by watermarked timestamp, secondary by score
+ * env.fromCall(
+ * "MyPTF",
+ * table
+ * .partitionBy($("key"))
+ * .orderBy($("ts").asc(), $("score").desc())
+ * .asArgument("input_table")
+ * )
+ * }</pre>
+ *
+ * @param fields expressions for ordering (e.g., {@code $("ts").asc(),
$("score").desc()})
+ * @return a partitioned and ordered table
Review Comment:
a PTF is not an expression, so it cannot be used at regular scalar function
locations.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
