public class IncrementalAggregateWindowFunction<W extends Window> extends RichWindowFunction<Row,CRow,Tuple,W>
param: numGroupingKey The number of grouping keys. param: numAggregates The number of aggregates. param: finalRowArity The arity of the final output row.
Constructor and Description |
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IncrementalAggregateWindowFunction(int numGroupingKey,
int numAggregates,
int finalRowArity) |
Modifier and Type | Method and Description |
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void |
apply(Tuple key,
W window,
Iterable<Row> records,
Collector<CRow> out)
Calculate aggregated values output by aggregate buffer, and set them into output
Row based on the mapping relation between intermediate aggregate data and output data.
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void |
open(Configuration parameters)
Initialization method for the function.
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close, getIterationRuntimeContext, getRuntimeContext, setRuntimeContext
public IncrementalAggregateWindowFunction(int numGroupingKey, int numAggregates, int finalRowArity)
public void open(Configuration parameters)
RichFunction
The configuration object passed to the function can be used for configuration and initialization. The configuration contains all parameters that were configured on the function in the program composition.
public class MyMapper extends FilterFunction<String> {
private String searchString;
public void open(Configuration parameters) {
this.searchString = parameters.getString("foo");
}
public boolean filter(String value) {
return value.equals(searchString);
}
}
By default, this method does nothing.
open
in interface RichFunction
open
in class AbstractRichFunction
parameters
- The configuration containing the parameters attached to the contract.Configuration
public void apply(Tuple key, W window, Iterable<Row> records, Collector<CRow> out)
key
- (undocumented)window
- (undocumented)records
- (undocumented)out
- (undocumented)Copyright © 2014–2018 The Apache Software Foundation. All rights reserved.