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Support for WASM UDAFs #105

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mildbyte opened this issue Sep 12, 2022 · 0 comments

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mildbyte commented Sep 12, 2022

We currently do not support UDAFs (user defined aggregation functions), even though DataFusion does (https://docs.rs/datafusion/latest/datafusion/physical_plan/udaf/struct.AggregateUDF.html).

The most basic implementation would be expecting the WASM function to be an "accumulator" (which we'll use to implement https://docs.rs/datafusion/latest/datafusion/physical_plan/trait.Accumulator.html) that takes in the current state, the new value, and returns the new state (or stores the state in the WASM memory)?

Inspiration: https://www.postgresql.org/docs/current/xaggr.html / https://www.postgresql.org/docs/current/sql-createaggregate.html

mildbyte mentioned this issue

RFC 001: WASM UDFs splitgraph/seafowl-rfcs#1

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