Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/18659#discussion_r139579800
--- Diff: python/pyspark/worker.py ---
@@ -71,7 +73,19 @@ def wrap_udf(f, return_type):
return lambda *a: f(*a)
-def read_single_udf(pickleSer, infile):
+def wrap_pandas_udf(f, return_type):
+ def verify_result_length(*a):
+ kwargs = a[-1]
+ result = f(*a[:-1], **kwargs)
+ if len(result) != kwargs["length"]:
+ raise RuntimeError("Result vector from pandas_udf was not the
required length: "
+ "expected %d, got %d\nUse input vector
length or kwarg['length']"
--- End diff --
typo: `kwarg['length']` -> `kwargs['length']`
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