[PIG-2057] udf having project-star/project-range as argument has single tuple in argument schema

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 0.7.0, 0.8.0, 0.9.0
• Assignee: Thejas Nair
• Reporter: Thejas Nair
• Created: 10/May/11 20:06
• Updated: 10/May/11 20:09

Description

When a udf has a project-star or project-range-to-end (eg- $3 ..)as the argument, then to find the appropriate matching udf class, pig type checker (TypeCheckingRelVisitor) creates a UDF input schema that has a single tuple as the argument. But at runtime, the udf will actually get an input that has the expanded list of columns - not a tuple containing a single tuple as indicated by schema used in typechecking.

The patch in PIG-1938 has fix for the case where input schema is present, as it expands the project-star or project-range in that case. Project-range is expanded even in input schema is not present, if it is not a project-to-end, as the number of columns present in such cases is known.

Issue Links

• is blocked by: PIG-1577 support to variable number of arguments in UDF