Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/23096#discussion_r235185654
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala
---
@@ -648,7 +648,11 @@ class SparkSession private(
* @since 2.0.0
*/
def sql(sqlText: String): DataFrame = {
- Dataset.ofRows(self, sessionState.sqlParser.parsePlan(sqlText))
+ val tracker = new QueryPlanningTracker
--- End diff --
It's because this is a Nice-To-Have instead of Must-Have. The framework
seems to be designed to support disabling by assigning `None` here.
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