Combine evaluate_stateful and evaluate_inside_range #6665
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alamb
approved these changes
Jun 14, 2023
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This makes sense to me @mustafasrepo and is a very nice cleanup. Thank you!
| /// Can this function be evaluated with (only) rank | ||
| /// | ||
| /// If `include_rank` is true, then [`Self::create_evaluator`] must | ||
| /// implement [`PartitionEvaluator::evaluate_with_rank`] | ||
| /// implement [`PartitionEvaluator::evaluate_with_rank_all`] |
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Do you plan to give the same treatment (move to PartitionEvaluator) to include_rank?
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We can do so, what do you think about it. Should we do that?
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For consistency, I have moved include_rank flag to PartitionEvaluator also.
| ScalarValue::iter_to_array(res.into_iter()) | ||
| } else { | ||
| Err(DataFusionError::NotImplemented( | ||
| "evaluate_all is not implemented by default".into(), |
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Suggested change
| "evaluate_all is not implemented by default".into(), | |
| format!("evaluate_all is not implemented for {} when using window frames", self.name()), |
I think the error could be more helpful, but I can also add that as a follow on PR
alamb
approved these changes
Jun 14, 2023
| @@ -115,12 +115,6 @@ pub(crate) struct RankEvaluator { | |||
| } | |||
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| impl PartitionEvaluator for RankEvaluator { | |||
| fn get_range(&self, idx: usize, _n_rows: usize) -> Result<Range<usize>> { | |||
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Which issue does this PR close?
Related to #5781
Rationale for this change
What changes are included in this PR?
This PR implements the proposal in the #PR12
evaluate_statefulandevaluate_inside_rangeare combined under singleevaluatemethodsuses_window_frameandsupports_bounded_executionmethods are moved fromBoundedWindowFunctionExprtoPartitionEvaluator.With the changes in this PR new Evaluators can be implemented according to table below.
evaluate_all(if we were to implementPERCENT_RANKit would end up in this quadrant, we cannot produce any result without seeing whole data)evaluate(optionally can also implementevaluate_allfor more optimized implementation. However, there will be default implementation that is suboptimal) . If we were to implementROW_NUMBERit will end up in this quadrant. ExampleOddRowNumbershowcases this use caseevaluate(I think as long asuses_window_frameistrue. There is no way forsupports_bounded_executionto be false). I couldn't come up with any example for this quadrantevaluate. If we were to implementFIRST_VALUE, it would end up in this quadrantAre these changes tested?
Are there any user-facing changes?