PIG shouldn't pass all input to a UDF if the UDF specify no argument
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Key: PIG-1573
URL: https://issues.apache.org/jira/browse/PIG-1573
Project: Pig
Issue Type: Bug
Affects Versions: 0.7.0
Reporter: Xuefu Zhang
Fix For: 0.9.0
Currently If in a pig script user uses a UDF with no argument, PIG backend
assumes that the UDF takes all input so at run time it passes all input as a
tuple to the UDF. This assumption is incorrect, causing conceptual confusions.
If a UDF takes all input, it can specify a star (*) as its argument. If it
specify no argument at all, then we assume that it requires no input data.
We need to differentiate no input and all input for a UDF. Thus, in case that a
UDF specify no argument, backend should pass the UDF an empty tuple.
See notes in PIG-1586 for more information.
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