sarutak opened a new pull request #25280: [SPARK-28548][SQL] explain() shows wrong result for persisted DataFrames after some operations URL: https://github.com/apache/spark/pull/25280 ## What changes were proposed in this pull request? After some operations against Datasets and then persist them, Dataset.explain shows wrong result. One of those operations is explain() itself. An example here. ``` val df = spark.range(10) df.explain df.persist df.explain ``` Expected result is like as follows. ``` == Physical Plan == *(1) ColumnarToRow +- InMemoryTableScan [id#7L] +- InMemoryRelation [id#7L], StorageLevel(disk, memory, deserialized, 1 replicas) +- *(1) Range (0, 10, step=1, splits=12) ``` But I got this. ``` == Physical Plan == *(1) Range (0, 10, step=1, splits=12) ``` This issue is caused by `withCachedData` in `QueryExecution` is materialized early when `explain()` or such methods are called so this patch prevents it. ## How was this patch tested? Additional test cases in `ExplainSuite.scala`
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