Nathan Smith created PIG-4726:
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Summary: "Incompatable field schema" with MIN(datetime_field) and
explicit output type
Key: PIG-4726
URL: https://issues.apache.org/jira/browse/PIG-4726
Project: Pig
Issue Type: Bug
Affects Versions: 0.15.0
Reporter: Nathan Smith
Priority: Minor
Example:
{code}
grunt> data = LOAD 'file.csv' USING PigStorage(',') AS
(f1:chararray,f2:datetime);
grunt> earliest_datum = FOREACH (GROUP data ALL) GENERATE MIN(data.f2);
grunt> earliest_datum = FOREACH (GROUP data ALL) GENERATE MIN(data.f2) AS
earliest;
grunt> describe earliest_datum;
earliest_datum: {earliest: datetime}
grunt> earliest_datum = FOREACH (GROUP data ALL) GENERATE MIN(data.f2) AS
earliest:datetime;
2015-11-03 23:20:00,422 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR
1031: Incompatable field schema: declared is "earliest:datetime", infered is
":double"
grunt> earliest_datum = FOREACH (GROUP data ALL) GENERATE MIN(data.f2) AS
earliest:double;
2015-11-03 23:20:07,454 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR
1031: Incompatable field schema: declared is "earliest:double", infered is
":datetime"
{code}
The example is contrived, but applying MIN to other field types in the same
fashion seems to behave as expected.
Also affects MAX.
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