[GitHub] [iceberg] rdblue commented on pull request #2017: Move RewriteDelete to the analyzer

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

rdblue commented on pull request #2017:
URL: https://github.com/apache/iceberg/pull/2017#issuecomment-753391385


   @dilipbiswal, I agree with you and that's why I think that it makes the most sense for this to be in the analyzer. We want all of those rewrite rules to be applied by the optimizer, rather than trying to do everything in this rule.
   
   The rewrite needs to run before subquery rewrites and optimizations are applied, but it currently runs in the operator optimization batch that is after OptimizeSubqueries, PullupCorrelatedPredicates, and others. By doing the initial rewrite in the analyzer, I think we can delegate more work to the optimizer so we can make this rewrite simple and have it optimized later.
   
   I think that the analyzer is a good place to run rewrites that produce a concrete logical plan for some action, like delete from. Another example is materialized view refresh. Ideally, we would produce a logical plan that then gets analyzed and optimized like a query that was written by hand.


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