cloud-fan commented on a change in pull request #32563:
URL: https://github.com/apache/spark/pull/32563#discussion_r643986329



##########
File path: sql/core/src/test/resources/sql-tests/results/explain-aqe.sql.out
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@@ -925,10 +925,7 @@ Created By [not included in comparison]
 Type: MANAGED
 Provider: PARQUET
 Location [not included in comparison]/{warehouse_dir}/explain_temp1
-Schema: root
--- key: integer (nullable = true)
--- val: integer (nullable = true)
-), false
+Schema: struct<key:int,val:int>), false

Review comment:
       My last concern is the loss of the nullable info. How does other 
databases do?




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