fix: reject unsupported filter argument in add_columns#5187
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The filter parameter was accepted and documented but never used, so any filter was silently dropped and every fragment was processed. Raise NotImplementedError instead of silently ignoring it.
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add_columnstakes afilterargument and documents it, but nothing in the function body ever uses it. The filter is silently dropped and every fragment is processed anyway, so a call that looks like it's narrowing the work quietly does the opposite.Instead of ignoring it,
add_columnsnow raisesNotImplementedErrorwhenfilteris notNone, and the docstring is updated to note the argument is reserved for whenget_fragmentssupports filtering. The defaultfilter=Nonepath is unchanged.Added a test that asserts passing a filter raises; the existing test still covers the normal
filter=Noneflow.