Strings (or other typed data) stored in maps cause problems with implicit casts
in operations
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Key: PIG-463
URL: https://issues.apache.org/jira/browse/PIG-463
Project: Pig
Issue Type: Bug
Affects Versions: types_branch
Reporter: Pradeep Kamath
Assignee: Pradeep Kamath
Fix For: types_branch
If a map in pig (say returned from a UDF) has a key with the value being a
string, then a lookup of that key being used in a context which expects a
string will cause an implicit cast to a string. This is because the Pig
frontented (logical layer) thinks of all map "values" as bytearrays and hence
introduces a Cast to convert the bytearray to string. The POCast class then
assumes its input is a DataByteArray and first tries to cast its input to
DataByteArray. This fails because the object in the input to the case which is
the value in the map is in fact already a string. So in these cases, we should
not try to cast but just return the input object in the POCast.
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