| Class | Description |
|---|---|
| DefaultIndexableLoader |
Used by MergeJoin .
|
| FindQuantiles | |
| GetMemNumRows |
UDF to get memory size of a tuple and extracts number of rows value from
special tuple created by PoissonSampleLoader
It is used by skewed join.
|
| GFAny |
built-in grouping function; permits system to choose any grouping.
|
| GFCross | |
| GFReplicate | |
| IdentityColumn |
Returns the input, used by DuplicateForEachColumnRewrite
to rewrite duplicate columns in ForEach.
|
| IsFirstReduceOfKey | |
| PartitionSkewedKeys |
Partition reducers for skewed keys.
|
| PoissonSampleLoader |
See "Skewed Join sampler" in http://wiki.apache.org/pig/PigSampler
|
| RandomSampleLoader |
A loader that samples the data.
|
| ReadScalars |
ReadScalars reads a line from a file and returns it as its value.
|
| SampleLoader |
Abstract class that specifies the interface for sample loaders
|
| StreamingUDF |
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