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Rohini Palaniswamy updated PIG-4662: ------------------------------------ Labels: Performance (was: ) This is a good one. We should definitely do it. > New optimizer rule: filter nulls before inner joins > --------------------------------------------------- > > Key: PIG-4662 > URL: https://issues.apache.org/jira/browse/PIG-4662 > Project: Pig > Issue Type: Improvement > Reporter: Ido Hadanny > Priority: Minor > Labels: Performance > > As stated in the docs, rewriting an inner join and filtering nulls from > inputs can be a big performance gain: > http://pig.apache.org/docs/r0.14.0/perf.html#nulls > We would like to add an optimizer rule which detects inner joins, and filters > nulls in all inputs: > A = filter A by t is not null; > B = filter B by x is not null; > C = join A by t, B by x; > see also: > http://stackoverflow.com/questions/32088389/is-the-pig-optimizer-filtering-nulls-before-joining -- This message was sent by Atlassian JIRA (v6.3.4#6332)