yaooqinn commented on issue #26847: [SPARK-30214][SQL] A new framework to resolve v2 commands URL: https://github.com/apache/spark/pull/26847#issuecomment-569851469 > One question is do we need to add new syntax `comment on` here too? Similar to `location`, `comment` became > I think it is good to unify the relation resolution. A consistent approach to do that sounds a good idea. One question is do we need to add new syntax `comment on` here too? We add `comment` syntax to modify `comment` since it has become a reserved property like `location`, the purposes here are 1) to eliminate vagueness between the property `comment` and the `COMMENT` subclause in `CREATE` syntax, later only subclause is valid; 2) to eliminate unexcepted change by `ALTER ... SET PROPERTIES` syntax for reserved properties, all reserved ones should have their specific syntaxes to modify. Also, if these ones are changed by outside systems not spark, we can ignore them according to this.
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