Github user KurtYoung commented on a diff in the pull request:
https://github.com/apache/flink/pull/3559#discussion_r106796945
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/calcite/FlinkPlannerImpl.scala
---
@@ -100,6 +101,7 @@ class FlinkPlannerImpl(
assert(validatedSqlNode != null)
val rexBuilder: RexBuilder = createRexBuilder
val cluster: RelOptCluster = RelOptCluster.create(planner,
rexBuilder)
+ cluster.setMetadataProvider(FlinkDefaultRelMetadataProvider.INSTANCE)
--- End diff --
I remembered that in #3058 you also set the provider to
`RelMetadataQuery.THREAD_PROVIDERS` by calling:
```
RelMetadataQuery.THREAD_PROVIDERS.set(JaninoRelMetadataProvider.of(cluster.getMetadataProvider))
```
Why it's not needed here?
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