Introduce ToBackend expression
#1115
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Adds a `ToCudfBackend` expression for "pandas" to "cudf" conversion, preventing `to_backend("cudf")` operations from blocking useful optimizations like predicate pushdown.
This is the dask-cudf component of dask/dask-expr#1115
Authors:
- Richard (Rick) Zamora (https://github.com/rjzamora)
Approvers:
- Mads R. B. Kristensen (https://github.com/madsbk)
URL: #16573
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Introduces a simple
ToBackend(andToPandasBackendimplementation).The current approach of using
map_partitionsinPandasBackendEntrypointeffectively blocks query-planning optimizations when data is moved between GPU and CPU. The obvious solution is to use a simpleExprclass.