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Posted to notifications@ignite.apache.org by GitBox <gi...@apache.org> on 2021/01/20 12:23:57 UTC

[GitHub] [ignite-3] AMashenkov commented on pull request #2: IGNITE-13748: Schema configuration public API.

AMashenkov commented on pull request #2:
URL: https://github.com/apache/ignite-3/pull/2#issuecomment-763569419


   > Do we need some other objects like FunctionalBasedIndex (like
   > CREATE UNIQUE INDEX MY_UPPER_IDX on MY_TABLE(upper(LOGIN))
   > or even combine it with partial one, like:
   > CREATE UNIQUE INDEX MY_UPPER_IDX on MY_TABLE(upper(NAME)) WHERE (deleted = false)
   
   Let's add functional index support within a separate ticket. A functional index can't be UNIQUE because it is not columnar index, but UNIQUE index must contain all affinity columns.
   UNIQUE index on arbitrary columns/values will  be very slow on update operation and we won't support this case.


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