Make changes to the parser to support new types functionality
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Key: PIG-159
URL: https://issues.apache.org/jira/browse/PIG-159
Project: Pig
Issue Type: Sub-task
Components: impl
Reporter: Alan Gates
Assignee: Alan Gates
In order to support the new types functionality described in
http://wiki.apache.org/pig/PigTypesFunctionalSpec, the parse needs to change in
the following ways:
1) AS needs to support types in addition to aliases. So where previously it
was legal to say:
a = load 'myfile' as a, b, c;
it will now also be legal to say
a = load 'myfile' as a integer, b float, c chararray;
2) Non string constants need to be supported. This includes non-string atomic
types (integer, long, float, double) and the non-atomic types bags, tuples, and
maps.
3) A cast operator needs to be added so that fields can be explicitly casted.
4) Changes to DEFINE, to allow users to declare arguments and return types for
UDFs
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