Package | Description |
---|---|
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer | |
org.apache.pig.backend.hadoop.executionengine.physicalLayer.plans |
Modifier and Type | Method and Description |
---|---|
void |
PhyPlanSetter.visitMergeCoGroup(POMergeCogroup mergeCoGrp) |
void |
MRCompiler.visitMergeCoGroup(POMergeCogroup poCoGrp)
Leftmost relation is referred as base relation (this is the one fed into mappers.)
First, close all MROpers except for first one (referred as baseMROPer)
Then, create a MROper which will do indexing job (idxMROper)
Connect idxMROper before the mappedMROper in the MRPlan.
|
Modifier and Type | Method and Description |
---|---|
void |
PhyPlanVisitor.visitMergeCoGroup(POMergeCogroup mergeCoGrp) |
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