James Porritt created SPARK-22468:
-------------------------------------
Summary: subtract creating empty DataFrame that isn't initialised
properly
Key: SPARK-22468
URL: https://issues.apache.org/jira/browse/SPARK-22468
Project: Spark
Issue Type: Bug
Components: PySpark
Affects Versions: 2.2.0
Reporter: James Porritt
I have an issue whereby a subtract between two DataFrames that will correctly
end up with an empty DataFrame, seemingly has the DataFrame not initialised
properly.
In my code I try and do a subtract both ways:
x = a.subtract(b)
y = b.subtract(a)
I then do an .rdd.isEmpty() on both of them to check if I need to do something
with the results. Often the 'y' subtract will fail if the 'x' subtract is
non-empty. It's hard to reproduce however. The error I will get is:
File "<my spark script>", line 642, in <my function>
if y.rdd.isEmpty():
File "<my base
dir>/spark-2.2.0-bin-hadoop2.7/python/lib/pyspark.zip/pyspark/rdd.py", line
1377, in isEmpty
File "<my base
dir>/spark-2.2.0-bin-hadoop2.7/python/lib/pyspark.zip/pyspark/rdd.py", line
1343, in take
File "<my base
dir>/spark-2.2.0-bin-hadoop2.7/python/lib/pyspark.zip/pyspark/context.py", line
992, in runJob
File "<my base
dir>/spark-2.2.0-bin-hadoop2.7/python/lib/pyspark.zip/pyspark/rdd.py", line
2455, in _jrdd
File "<my base
dir>/spark-2.2.0-bin-hadoop2.7/python/lib/pyspark.zip/pyspark/rdd.py", line
2390, in _wrap_function
File "<my base
dir>/spark-2.2.0-bin-hadoop2.7/python/lib/py4j-0.10.4-src.zip/py4j/java_gateway.py",
line 1386, in __call__
File "<my base
dir>/spark-2.2.0-bin-hadoop2.7/python/lib/py4j-0.10.4-src.zip/py4j/java_gateway.py",
line 1372, in _get_args
File "<my base
dir>/spark-2.2.0-bin-hadoop2.7/python/lib/py4j-0.10.4-src.zip/py4j/java_collections.py",
line 501, in convert
AttributeError: 'NoneType' object has no attribute 'add'
Sometimes the error will complain about it not having a 'size' parameter.
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