-How to filter by pig datatype?
Lex H 2012-11-22, 01:54
Attached is a tiny testcase illustrating my problem.
What I would like to know is how to filter by Pig datatype.
e.g. something like:
filtered = FILTER some_data BY some_variable IS_MAP_TYPE;
Can anyone advise if this can be accomplished with Pig?
We have a field that is sometimes a 'map' sometimes a chararray.
Doing something like the following statement fails, presumable because it's
trying to a key-value lookup on something that's not a 'map'.
-- json#'data' is sometimes a map, sometimes not.
trivias = FOREACH data GENERATE json#'data'#'trivia' AS trivia:charray;
This has come about from us working with JSON data with Pig via Elephant