Hurshal Patel created SPARK-12348:
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Summary: PySpark _inferSchema crashes with incorrect exception on
an empty RDD
Key: SPARK-12348
URL: https://issues.apache.org/jira/browse/SPARK-12348
Project: Spark
Issue Type: Bug
Components: PySpark
Affects Versions: 1.5.0
Reporter: Hurshal Patel
Priority: Minor
{code:python}
>>> rdd = sc.emptyRDD()
>>> df = sqlContext.createDataFrame(rdd)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/memsql/spark/python/pyspark/sql/context.py", line 404, in
createDataFrame
rdd, schema = self._createFromRDD(data, schema, samplingRatio)
File "/home/memsql/spark/python/pyspark/sql/context.py", line 285, in
_createFromRDD
struct = self._inferSchema(rdd, samplingRatio)
File "/home/memsql/spark/python/pyspark/sql/context.py", line 229, in
_inferSchema
first = rdd.first()
File "/home/memsql/spark/python/pyspark/rdd.py", line 1320, in first
raise ValueError("RDD is empty")
ValueError: RDD is empty
{code}
throws "RDD is empty" in rdd.first() instead of the intended message "The first
row in RDD is empty, can not infer schema" in sqlContext._inferSchema
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