[jira] [Created] (SPARK-26810) Fixing SPARK-25072 broke existing code and fails to show error message

["Arttu Voutilainen (JIRA)" <ji...@apache.org>]

Arttu Voutilainen created SPARK-26810:
-----------------------------------------

             Summary: Fixing SPARK-25072 broke existing code and fails to show error message
                 Key: SPARK-26810
                 URL: https://issues.apache.org/jira/browse/SPARK-26810
             Project: Spark
          Issue Type: Bug
          Components: PySpark
    Affects Versions: 2.4.0
            Reporter: Arttu Voutilainen


Hey,

We upgraded Spark recently, and https://issues.apache.org/jira/browse/SPARK-25072 caused our pipeline to fail after the upgrade. Annoyingly, the error message formatting also threw an exception itself, thus hiding the message we should have seen.

Repro using gettyimages/docker-spark, on 2.4.0:
{code}
from pyspark.sql import Row
r = Row(['a','b'])
r('1', '2')
{code}
{code}
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/spark-2.4.0/python/pyspark/sql/types.py", line 1505, in __call__
    "but got %s" % (self, len(self), args))
  File "/usr/spark-2.4.0/python/pyspark/sql/types.py", line 1552, in __repr__
    return "<Row(%s)>" % ", ".join(self)
TypeError: sequence item 0: expected str instance, list found
{code}
On 2.3.1, and also showing how this was used:
{code}
from pyspark.sql import Row, types as T

r = Row(['a','b'])
df = spark.createDataFrame([Row(col='doesntmatter')])
rdd = df.rdd.mapPartitions(lambda p: [r('a1','b2')])
spark.createDataFrame(rdd, T.StructType([T.StructField('a', T.StringType()), T.StructField('b', T.StringType())])).collect()
{code}
{code}
[Row(a='a1', b='b2'), Row(a='a1', b='b2')]
{code}
While I do think the code we had was quite horrible, it used to work. The unexpected error came from __repr__ as it assumes that the arguments given to Row constructor are strings. That sounds like a reasonable assumption, should the Row constructor validate that it holds true maybe? (I guess that might be another potentially breaking change though, if someone has as weird code as this one...)



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