/** {@inheritDoc} */
public void setNextReader(LeafReaderContext ctx) throws IOException {
if (valueSource == null) {
// first time we've collected local values, get the right ValueSource
valueSource = (null == ft) ? statsField.getValueSource() : ft.getValueSource(sf, null);
vsContext = ValueSource.newContext(statsField.getSearcher());
}
values = valueSource.getValues(vsContext, ctx);
}
public NumericStatsValues(StatsField statsField) {
super(statsField);
this.computeSum = statsField.calculateStats(Stat.sum);
this.computeSumOfSquares = statsField.calculateStats(Stat.sumOfSquares);
this.computePercentiles = statsField.calculateStats(Stat.percentiles);
if (computePercentiles) {
tdigest = new AVLTreeDigest(statsField.getTdigestCompression());
}
}
/**
* Creates an instance of StatsValues which supports values from the specified {@link StatsField}
*
* @param statsField {@link StatsField} whose statistics will be created by the resulting {@link
* StatsValues}
* @return Instance of {@link StatsValues} that will create statistics from values from the
* specified {@link StatsField}
*/
public static StatsValues createStatsValues(StatsField statsField) {
final SchemaField sf = statsField.getSchemaField();
if (null == sf) {
// function stats
return new NumericStatsValues(statsField);
}
final FieldType fieldType = sf.getType(); // TODO: allow FieldType to provide impl.
if (TrieDateField.class.isInstance(fieldType)) {
return new DateStatsValues(statsField);
} else if (TrieField.class.isInstance(fieldType)) {
return new NumericStatsValues(statsField);
} else if (StrField.class.isInstance(fieldType)) {
return new StringStatsValues(statsField);
} else if (sf.getType().getClass().equals(EnumField.class)) {
return new EnumStatsValues(statsField);
} else {
throw new SolrException(
SolrException.ErrorCode.BAD_REQUEST,
"Field type " + fieldType + " is not currently supported");
}
}
/** {@inheritDoc} */
@Override
public NamedList<?> getStatsValues() {
NamedList<Object> res = new SimpleOrderedMap<>();
if (statsField.includeInResponse(Stat.min)) {
res.add("min", min);
}
if (statsField.includeInResponse(Stat.max)) {
res.add("max", max);
}
if (statsField.includeInResponse(Stat.count)) {
res.add("count", count);
}
if (statsField.includeInResponse(Stat.missing)) {
res.add("missing", missing);
}
if (statsField.includeInResponse(Stat.distinctValues)) {
res.add("distinctValues", distinctValues);
}
if (statsField.includeInResponse(Stat.countDistinct)) {
res.add("countDistinct", countDistinct);
}
if (statsField.includeInResponse(Stat.cardinality)) {
if (statsField.getIsShard()) {
res.add("cardinality", hll.toBytes());
} else {
res.add("cardinality", hll.cardinality());
}
}
addTypeSpecificStats(res);
if (!facets.isEmpty()) {
// add the facet stats
NamedList<NamedList<?>> nl = new SimpleOrderedMap<>();
for (Map.Entry<String, Map<String, StatsValues>> entry : facets.entrySet()) {
NamedList<NamedList<?>> nl2 = new SimpleOrderedMap<>();
nl.add(entry.getKey(), nl2);
for (Map.Entry<String, StatsValues> e2 : entry.getValue().entrySet()) {
nl2.add(e2.getKey(), e2.getValue().getStatsValues());
}
}
res.add(FACETS, nl);
}
return res;
}
public DateStatsValues(StatsField statsField) {
super(statsField);
this.computeSum = statsField.calculateStats(Stat.sum);
this.computeSumOfSquares = statsField.calculateStats(Stat.sumOfSquares);
}
protected AbstractStatsValues(StatsField statsField) {
this.statsField = statsField;
this.computeCount = statsField.calculateStats(Stat.count);
this.computeMissing = statsField.calculateStats(Stat.missing);
this.computeCalcDistinct =
statsField.calculateStats(Stat.countDistinct)
|| statsField.calculateStats(Stat.distinctValues);
this.computeMin = statsField.calculateStats(Stat.min);
this.computeMax = statsField.calculateStats(Stat.max);
this.computeMinOrMax = computeMin || computeMax;
this.distinctValues = computeCalcDistinct ? new TreeSet<T>() : null;
this.computeCardinality = statsField.calculateStats(Stat.cardinality);
if (computeCardinality) {
hasher = statsField.getHllOptions().getHasher();
hll = statsField.getHllOptions().newHLL();
assert null != hll : "Cardinality requires an HLL";
} else {
hll = null;
hasher = null;
}
// alternatively, we could refactor a common base class that doesn't know/care
// about either SchemaField or ValueSource - but then there would be a lot of
// duplicate code between "NumericSchemaFieldStatsValues" and
// "NumericValueSourceStatsValues" which would have diff parent classes
//
// part of the complexity here being that the StatsValues API serves two
// masters: collecting concrete Values from things like DocValuesStats and
// the distributed aggregation logic, but also collecting docIds which it
// then
// uses to go out and pull concreate values from the ValueSource
// (from a func, or single valued field)
if (null != statsField.getSchemaField()) {
assert null == statsField.getValueSource();
this.sf = statsField.getSchemaField();
this.ft = sf.getType();
} else {
assert null != statsField.getValueSource();
assert null == statsField.getSchemaField();
this.sf = null;
this.ft = null;
}
}
