bharath-techie commented on issue #13188:
URL: https://github.com/apache/lucene/issues/13188#issuecomment-2068963512
### DataCubesFormat
```
public abstract class DataCubesFormat implements NamedSPILoader.NamedSPI {
/**
* Returns producer to read the data cubes from the index.
*/
public abstract DataCubesProducer<?> fieldsProducer(SegmentReadState
state) throws IOException;
/**
* Returns a DocValuesConsumer to write a 'DataCubes' index based on doc
values.
*/
public abstract DataCubesDocValuesConsumer fieldsConsumer(
SegmentWriteState state, DataCubesConfig dataCubesConfig) throws
IOException;
}
```
### DataCubesConfig
```
public class DataCubesConfig {
public List<DataCubeField> getFields() {
// Implementation
}
// Additional configuration options as needed
}
public class DataCubeField {
public List<Dimension> getDimensions();
public List<Metric> getMetrics();
public static class DataCubeFieldProvider {
public DataCubeField readDataCubeField(DataInput in) {
// Implementation
}
public void writeDataCubeField(DataCubeField dataCubeField,
DataOutput out) {
// Implementation
}
}
}
public class Dimension {
public String fieldName;
// Additional dimension-specific options
}
public class Metric {
public String fieldName;
public AggregationFunction aggregationFunction;
// Additional metric-specific options
}
```
- The DataCubesConfig class contains a list of DataCubeField objects and
additional configuration options as needed.
- The DataCubeField represents a data cube field and contains lists of
Dimension and Metric fields and additional custom values.
- DataCubeFieldProvider provides methods to read and write DataCubeField
objects from/to input/output.
- The DataCubesConfig is supplied via the IndexWriteConfig and saved as part
of the SegmentInfo. Custom data for custom formats can be supplied based on the
DataCubeFieldProvider. [ Similar to sort field ]
#### DataCubesDocValuesConsumer
The DataCubesDocValuesConsumer consumes the DocValues writer to read the
DocValues data and create new indices based on the DataCubesConfig.
#### DataCubesProducer
The DataCubesProducer/Reader is used to read the 'DataCubes' index from the
segment.
#### Example
In this example, I've implemented 'StarTree' index by extending
'DataCubeFormat'
```
{
Directory dir = newDirectory();
IndexWriterConfig iwc =
newIndexWriterConfig().setCodec(Codec.forName("Lucene95"));
// Supply the dimensions and metrics fields to form the data cube config
Set<String> dims = Set.of("clientip", "targetip");
Set<String> metrics = Set.of("status");
StarTreeDataCubeField field = new StarTreeDataCubeField("datacube-1",
dims, metrics);
StarTreeDataCubeField[] fieldArr = new StarTreeDataCubeField[]{field};
StarTreeCubeConfig starConfig = new StarTreeCubeConfig(fieldArr);
iwc.setDataCube(starConfig);
IndexWriter writer = new IndexWriter(dir, iwc);
int numDoc = 10;
add(writer);
writer.commit();
writer.close();
IndexReader reader = DirectoryReader.open(dir);
// read the DataCubeValues from the underlying index
for (LeafReaderContext leafReaderContext : reader.leaves()) {
DataCubeValues<?> dataCubeValues =
leafReaderContext.reader().getDataCubeValues(DATA_CUBE_FIELD);
// todo : implementation
}
reader.close();
dir.close();
}
```
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