Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/17649#discussion_r112824524
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala ---
@@ -267,8 +271,15 @@ case class AlterTableUnsetPropertiesCommand(
}
}
}
+ // if 'comment' key is present in the seq of keys which needs to be
unset then reset the table
+ // level comment with none.
+ val tableComment = if (propKeys.contains("comment")) {
+ None
+ } else {
+ table.properties.get("comment")
+ }
--- End diff --
Nit:
```Scala
val comment = if (propKeys.contains("comment")) None else
table.properties.get("comment")
```
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