Ignore Polars dynamic predicates#482
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Fixes #460
Remove dynamic predicates from the expression tree. Apart from it being a panic which is always a bad signal / bug, it's surprising that
pl.DataFrame.filtercannot process apl.Exprthat polars itself created.In any case, this will remove dynamic predicates from the tree and either produce a pushdown filter fro duckdb, or filter in polars directly.