swuferhong commented on code in PR #21530:
URL: https://github.com/apache/flink/pull/21530#discussion_r1058020032
##########
flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/api/config/OptimizerConfigOptions.java:
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@@ -135,6 +135,24 @@ public class OptimizerConfigOptions {
.defaultValue(false)
.withDescription("Enables join reorder in optimizer.
Default is disabled.");
+ @Documentation.TableOption(execMode =
Documentation.ExecMode.BATCH_STREAMING)
+ public static final ConfigOption<Boolean>
TABLE_OPTIMIZER_BUSY_JOIN_REORDER =
+ key("table.optimizer.busy-join-reorder")
+ .booleanType()
+ .defaultValue(false)
+ .withDescription(
+ "Enables busy join reorder in optimizer. Default
is disabled.");
+
+ @Documentation.TableOption(execMode =
Documentation.ExecMode.BATCH_STREAMING)
+ public static final ConfigOption<Integer>
TABLE_OPTIMIZER_BUSY_JOIN_REORDER_DP_THRESHOLD =
+ key("table.optimizer.busy-join-reorder-dp-threshold")
+ .intType()
+ .defaultValue(12)
Review Comment:
> can you explain why we choose `12` as the threshold value ?
New we set the default value to -1, which means that Flink disable busy join
reorder by default. 12 is an empirical parameter provided by the designer of
the algorithm.
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