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https://issues.apache.org/jira/browse/BEAM-7525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17188061#comment-17188061
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Monica Song commented on BEAM-7525:
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allowing a customizable hash function would also mean having the user provide
the max hash size and sample size space (since hashes can be signed/unsigned
and 32/64/128 bit). This may be a knob that relies too much on knowledge of
hash functions.
> support hash_fn for Python ApproximateUniqueCombineFn transform
> ---------------------------------------------------------------
>
> Key: BEAM-7525
> URL: https://issues.apache.org/jira/browse/BEAM-7525
> Project: Beam
> Issue Type: Task
> Components: sdk-py-core
> Reporter: Hannah Jiang
> Priority: P3
>
> ApproximateUniqueCombineFn is using default hash function for estimation.
> We can pass a hash_fn and overwrite default hash function to support better
> estimation performance.
> Parent issue: BEAM-6693
>
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