timsaucer opened a new pull request, #880:
URL: https://github.com/apache/datafusion-python/pull/880
# Which issue does this PR close?
Closes #845
# Rationale for this change
Currently users can only create user defined scalar functions and user
defined window functions. This enables authoring user defined window functions.
It is a core functionality that has been missing on the python library.
# What changes are included in this PR?
Designed similar to the UDAF, we have an abstract class for UDWF that users
must inherit from.
# Are there any user-facing changes?
Adds new udwf() function and WindowUDF class.
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