[GitHub] rdblue opened a new issue #35: Implement strict projection in more transforms

[GitBox <gi...@apache.org>]

rdblue opened a new issue #35: Implement strict projection in more transforms
URL: https://github.com/apache/incubator-iceberg/issues/35
 
 
   Strict projection isn't required and wasn't implemented for several of the partitioning transformations. When strict projection isn't implemented (the `projectStrict` method returns `null`) Iceberg will fall back to a safe implementation. For example, residual evaluation will not remove predicates because they cannot be guaranteed to be true, and deletes can't determine that all values in a file match so the file can't be deleted (deletes usually fall back to min/max metrics evaluation).
   
   Implementing strict projection for all transforms where possible will help query efficiency, will make deletes faster, etc.

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