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https://issues.apache.org/jira/browse/PIG-161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12608211#action_12608211
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Shravan Matthur Narayanamurthy commented on PIG-161:
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I would love to have a matric type with Pig. However, its pretty tricky as we
need to manage order under the hood by associating metadata with the elements
of the matrix as hadoop also doesn't support order.
As far as the algebraic thing goes, there is no constraint as such I guess.
> Rework physical plan
> --------------------
>
> Key: PIG-161
> URL: https://issues.apache.org/jira/browse/PIG-161
> Project: Pig
> Issue Type: Sub-task
> Reporter: Alan Gates
> Assignee: Alan Gates
> Attachments: arithmeticOperators.patch, BinCondAndNegative.patch,
> CastAndMapLookUp.patch, exprplan.patch, incr2.patch, incr3.patch,
> incr4.patch, incr5.patch, logToPhyTranslator.patch, missingOps.patch,
> MRCompilerTests_PlansAndOutputs.txt, Phy_AbsClass.patch, physicalOps.patch,
> physicalOps.patch, physicalOps.patch, physicalOps.patch,
> physicalOps_latest.patch, POCast.patch, POCast.patch, podistinct.patch,
> pogenerate.patch, pogenerate.patch, pogenerate.patch, posort.patch,
> POUserFuncCorrection.patch,
> TEST-org.apache.pig.test.TestLocalJobSubmission.txt,
> TEST-org.apache.pig.test.TestLogToPhyCompiler.txt,
> TEST-org.apache.pig.test.TestLogToPhyCompiler.txt,
> TEST-org.apache.pig.test.TestMapReduce.txt,
> TEST-org.apache.pig.test.TestTypeCheckingValidator.txt,
> TEST-org.apache.pig.test.TestUnion.txt, translator.patch, translator.patch,
> translator.patch, translator.patch
>
>
> This bug tracks work to rework all of the physical operators as described in
> http://wiki.apache.org/pig/PigTypesFunctionalSpec
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