hvanhovell commented on a change in pull request #24654: [SPARK-27439][SQL]
Explainging Dataset should show correct resolved plans
URL: https://github.com/apache/spark/pull/24654#discussion_r285889661
##########
File path: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala
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@@ -498,12 +500,25 @@ class Dataset[T] private[sql](
* @since 1.6.0
*/
def explain(extended: Boolean): Unit = {
- val explain = ExplainCommand(queryExecution.logical, extended = extended)
-
sparkSession.sessionState.executePlan(explain).executedPlan.executeCollect().foreach
{
- // scalastyle:off println
- r => println(r.getString(0))
- // scalastyle:on println
+ val qe = if (isStreaming) {
Review comment:
Can we put this into a method that is shared by both the `Dataset` and the
explain command, e.g.:
```scala
def explainQueryExecution(plan: LogicalPlan, queryExecution: =>
QueryExecution): QueryExecution = {
if (plan.isStreaming) {
// This is used only by explaining `Dataset/DataFrame` created by
`spark.readStream`, so the
// output mode does not matter since there is no `Sink`.
new IncrementalExecution(
sparkSession, logicalPlan, OutputMode.Append(), "<unknown>",
UUID.randomUUID, UUID.randomUUID, 0, OffsetSeqMetadata(0, 0))
} else {
queryExecution
}
}
```
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