Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18419#discussion_r124066988
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SQLExecution.scala ---
@@ -100,7 +105,9 @@ object SQLExecution {
// all accumulator metrics will be 0. It will confuse people if we
show them in Web UI.
//
// A real case is the `DataFrame.count` method.
- throw new IllegalArgumentException(s"$EXECUTION_ID_KEY is already
set")
+ throw new IllegalArgumentException(s"$EXECUTION_ID_KEY is already
set, please wrap your " +
--- End diff --
`SQLExecution` is kind of a developer API, people who develop data source
may need to call `ignoreNestedExecutionId` inside their data source
implementation, as reading/writing data source will be run inside a command and
they may hit the nested execution problem. What do you think?
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