[Python] Hide hash_* functions from pyarrow.compute

[asfimport]

These functions have been specifically forbidden from being called by python. An attempt to do so will yield:

pyarrow.lib.ArrowNotImplementedError: Direct execution of HASH_AGGREGATE functions

The functions should not show up in pc.list_functions at all and pc.get_function should return None if given 'hash_sum'. Perhaps they could be stored in a different registry? Or, since we are special casing them anyways, special case them in some way they can be hidden?

Reporter: Weston Pace / @westonpace
Assignee: Alessandro Molina / @amol-

Related issues:

• [Python][C++] index_in_meta_binary/is_in_meta_binary should not show up in functions list (relates to)
• [C++] Duplicate functions array_filter/array_take and filter/take (is related to)

PRs and other links:

• GitHub Pull Request #11745

_{Note: This issue was originally created as ARROW-13943. Please see the migration documentation for further details.}

[asfimport]

Antoine Pitrou / @pitrou:
cc @amol-

[asfimport]

Alessandro Molina / @amol-:
Is the  Function::kind() available to pyarrow? It seems that comparing that to Function::HASH_AGGREGATE might be a way to filter those

[asfimport]

Antoine Pitrou / @pitrou:

>>> pc.get_function('hash_any')
arrow.compute.Function<name=hash_any, kind=hash_aggregate, arity=2, num_kernels=1>
>>> pc.get_function('hash_any').kind
'hash_aggregate'

[asfimport]

Antoine Pitrou / @pitrou:
Issue resolved by pull request 11745
#11745