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https://issues.apache.org/jira/browse/PIG-159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12596844#action_12596844
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Santhosh Srinivasan commented on PIG-159:
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With my last patch, I added getFieldSchema for expression operators.
Expressions will generate field schemas and not schemas. Schemas are associated
only with the relational operators. The top level operators will generate
schemas based on the field schemas returned by the constituent expressions.
ExpressionOperator extends LogicalOperator which has the abstract method
getSchem, and the method getType. As a result, these methods are present in
ExpressionOperator. The getSchema method for expressions will return null. The
getType method will be used for type checking (e.g.: the arithmetic operators
LOAdd, LOSubtract, etc.)
I will remove the getSchema methods in the expression operators and move them
up to the parent EpxressionOperator class.
> Make changes to the parser to support new types functionality
> -------------------------------------------------------------
>
> 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
> Attachments: parser_chages_v5.patch
>
>
> 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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