Looking at this statement
<https://github.com/apache/calcite/blame/master/druid/src/main/java/org/apache/calcite/adapter/druid/DruidQuery.java#L1570>,
it suggests that *org.apache.calcite.runtime.Hook.addThread(Function<T, R>)*
or *org.apache.calcite.runtime.Hook.add(Function<T, R>)* will be called for
QUERY_PLAN somewhere but I couldn't find it.

Is it kept this way just in case someone needs to extends QUERY_PLAN
handlers somehow but kept empty by default ? Would someone please explain
to me the purpose of this ?

Thanks,
Gelbana
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