Aggarwal-Raghav commented on code in PR #5872:
URL: https://github.com/apache/hive/pull/5872#discussion_r2155160993
##########
ql/src/java/org/apache/hadoop/hive/ql/exec/ExplainTask.java:
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@@ -1003,6 +1003,9 @@ public JSONObject outputPlan(Object work, PrintStream out,
Operator<? extends OperatorDesc> operator =
(Operator<? extends OperatorDesc>) work;
final int visitCnt = operatorVisits.merge(operator, 1, Integer::sum);
+ if (conf == null && this.work != null && this.work.getFetchTask() !=
null) {
+ conf = this.work.getFetchTask().getConf();
+ }
Review Comment:
Thanks for the review and suggestions @zabetak and will try to come up with
a UT as well.
**My understanding:**
1. I also though of passing the non-null config from `HiveProtoLoggingHook`
class but it would require some method parameter/argument changes across
classes and might need additional check if prologging is disabled. So didn't
gave a try 🙁.
2. The reason behind using `this.work.getFetchTask().getConf()` is that I
wanted to use the conf which was present in ExplainTask without propogating it
from other classes.
3. As you said that there are 9 references of conf but while debugging only
_ExplainTask#outputPlan()_ having
`conf.getIntVar(ConfVars.HIVE_EXPLAIN_NODE_VISIT_LIMIT)` is getting triggered.
So I think handling, the localized place should be enough.
5. Using `ConfVars.HIVE_EXPLAIN_NODE_VISIT_LIMIT.defaultIntVal`, as you
suggested, can work as using the default value shouldn't have any impact on
OtherInfoType.CONF. Will test and confirm.
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