Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/19535#discussion_r145655586
--- Diff: python/pyspark/sql/functions.py ---
@@ -44,6 +45,14 @@ def _(col):
return _
+def _wrap_deprecated_function(func, message):
+ """ Wrap the deprecated function to print out deprecation warnings"""
+ def _(col):
+ warnings.warn(message, DeprecationWarning)
+ return func(col)
--- End diff --
Here, I intendedly avoided `*args` and `**kwargs` to keep the argument
signature printed in pydoc, `help(...)`.
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