Github user jihoonson commented on a diff in the pull request:
https://github.com/apache/tajo/pull/1036#discussion_r69850288
--- Diff:
tajo-catalog/tajo-catalog-common/src/main/java/org/apache/tajo/catalog/AlterTableDesc.java
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@@ -51,6 +54,8 @@
@Expose
protected KeyValueSet properties;
@Expose
+ protected Set<String> propertyKeys;
--- End diff --
Since there is no additional descriptions on this variable, it would be
better if it has a more intuitive name like ```unsetPropertyKeys```.
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