Support UDAF to align Builtin aggregate function#10493
Support UDAF to align Builtin aggregate function#10493jayzhan211 merged 2 commits intoapache:mainfrom
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Signed-off-by: jayzhan211 <jayzhan211@gmail.com>
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This looks quite cool @jayzhan211 and the code is 👌 very nice. Thank you
One potential concern I have here is that I think this PR adds new feaures (e.g. support for filter/order by in user defined aggregates, I think) but not new tests.
However, given that the point of this exercise is to port built in functions to UDAF I think all the new features will be properly tested once that porting is complete
| )?; | ||
| let order_by = (!order_by.is_empty()).then_some(order_by); | ||
| let args = self.function_args_to_expr(args, schema, planner_context)?; | ||
| // TODO: Support filter and distinct for UDAFs |
| aggregate_function::AggregateFunction::Count, | ||
| ) if args.len() == 1 && is_wildcard(&args[0]) => true, | ||
| WindowFunctionDefinition::AggregateUDF(ref udaf) | ||
| if udaf.name() == "COUNT" && args.len() == 1 && is_wildcard(&args[0]) => |
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I wonder if we should document the COUNT somewhere. Also should it do a case insensitive comparison?
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The name should follow what is defined in Count struct. case sensitive is not needed, it is strictly comparing with fn name().
| &stats.num_rows, | ||
| agg_expr.as_any().downcast_ref::<expressions::Count>(), | ||
| ) { | ||
| // TODO implementing Eq on PhysicalExpr would help a lot here |
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https://docs.rs/datafusion/latest/datafusion/physical_expr/trait.PhysicalExpr.html# seems to imply it is possible to to compare PhysicalExprs (perhaps expr.eq(other_expr.as_any()) 🤔 )
I don't know PhysicalExpr doesn't implement PartialEq directly
pub trait PhysicalExpr: ... PartialEq<dyn Any> {`There was a problem hiding this comment.
I had not take a look carefully to the comment here, since they are not needed after removing builtin function
Don't worry, the test should be covered after porting the related test, if not I will add it. |
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Thanks @alamb |
* align udaf and builtin Signed-off-by: jayzhan211 <jayzhan211@gmail.com> * add more Signed-off-by: jayzhan211 <jayzhan211@gmail.com> --------- Signed-off-by: jayzhan211 <jayzhan211@gmail.com>
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Which issue does this PR close?
Closes #.
Rationale for this change
Most of the function expect the same args or the same behaviour as builtin aggregate function for UDAF.
This PR change most of them I need for #10484
What changes are included in this PR?
Are these changes tested?
Are there any user-facing changes?