Joshua Juen created PIG-5272:
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Summary: BagToString Output Schema
Key: PIG-5272
URL: https://issues.apache.org/jira/browse/PIG-5272
Project: Pig
Issue Type: Improvement
Reporter: Joshua Juen
Priority: Minor
The output schema from BagToTuple is nonsensical causing problems using the
tuple later in the same script.
For example: Given a bag: { data:chararray }, calling BagToTuple yields the
schema: ( data:chararray )
But, this makes no sense since if the above bag contains: {data1, data2, data3}
entries, the output tuple from BagToTuple will be:
(data1:chararray, data2:chararray, data3:chararray) != (data:chararray),the
declared output schema from the UDF.
Unfortunately, the schema of the tuple cannot be known during the initial
validation phase. Thus, I believe the output schema from the UDF should be
modified to be type tuple without the number of fields being fixed to the
number of columns in the input bag.
Under the current way, the elements in the tuple cannot be accessed in the
script after calling BagToTuple without getting an incompatible type error.
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