deprecate use of type in as clause of foreach statement
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Key: PIG-2216
URL: https://issues.apache.org/jira/browse/PIG-2216
Project: Pig
Issue Type: Bug
Reporter: Thejas M Nair
Fix For: 0.10
In the as clause of foreach statement, type can be specified, but that type is
actually not used (ie, it does not result in a cast). This behavior is
misleading.
{code}
F = foreach INP generate c1 as (name : chararray);
{code}
Pig 0.8 produces an error if c1 in above example is not of same type as
specified in the as clause.
In 0.9, that check seems to have been lost in the parser migration. It also
results in the logical plan thinking that the type of c1 is that specified in
the as clause. That can cause errors such as ClassCastException.
One way to be consistent here would have been to add cast for the as clause as
well. But having two ways to cast complicates things. So long term, I think the
use of types in as clause should be removed.
For 0.10, i think the check present in 0.8 should be added back, and the syntax
should be deprecated (resulting in a warning when used).
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