Andy Schlaikjer created PIG-2715:
------------------------------------
Summary: Cannot specify schema field alias for map value via
piglatin
Key: PIG-2715
URL: https://issues.apache.org/jira/browse/PIG-2715
Project: Pig
Issue Type: Bug
Components: parser
Affects Versions: 0.10.0
Reporter: Andy Schlaikjer
Programmatically, pig components are able to define schema field aliases for
map values, but the same cannot be done via piglatin. For example:
{code}
%default INPUT_PATH 'map_value_alias_bug.tsv';
A = LOAD '$INPUT_PATH' AS (
id: long,
-- events: [count: int] -- parse failure
events: [int]
);
DESCRIBE A;
A = FOREACH A GENERATE
id,
-- (map[count: int]) events -- parse failure
-- ([count: int]) events -- parse failure
-- events: [count: int] -- parse failure
-- events AS [count: int] -- parse failure
-- events AS events: [count: int] -- parse failure
([int]) events -- this is okay
;
DESCRIBE A;
quit;
{code}
When using the [Elephant Bird
project|https://github.com/kevinweil/elephant-bird/]'s [ThriftToPig
utility|https://github.com/kevinweil/elephant-bird/blob/master/src/java/com/twitter/elephantbird/pig/util/ThriftToPig.java#L273]
along with a Thrift message spec containing a map field, I see schemas of the
following form:
{code}
message: {id: long,events: map[events: int])}}
{code}
This same DESCRIBE output does not parse if used within piglatin.
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