sandeep-katta commented on issue #24182: [SPARK-27246][SQL]scalar subquery with no columns throws exception in spark shell URL: https://github.com/apache/spark/pull/24182#issuecomment-475621300 "scalar subquery with no column" UT is failing Reason: `treeString` is throwing exception [code](https://github.com/apache/spark/pull/24136/files#diff-f70523b948b7af21abddfa3ab7e1d7d6R185). Earlier this statement was in debug log, since debug is disabled this statement never executed in UT, now as per the new changes this `treeString` API is called so it is throwing exception.
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