Apache Solr Reference Guide Covering Apache Solr 6.0

Additional "Expert" local params are supported in some cases for affecting the behavior of some statistics:
percentiles
tdigestCompression - a positive numeric value defaulting to 100.0 controlling the compression
factor of the T-Digest. Larger values means more accuracy, but also uses more memory.
cardinality
hllPreHashed - a boolean option indicating that the statistics are being computed over a "long"
field that has already been hashed at index time – allowing the HLL computation to skip this step.
hllLog2m - an integer value specifying an explicit "log2m" value to use, overriding the heuristic
value determined by the cardinality local param and the field type – see the java-hll documentation
for more details
hllRegwidth - an integer value specifying an explicit "regwidth" value to use, overriding the
heuristic value determined by the cardinality local param and the field type – see the java-hll docum
entation for more details
calcDistinct - for backwards compatibility, calcDistinct=true may be specified as an alias for
both countDistinct=true distinctValues=true
Examples
Here we compute some statistics for the price field. The min, max, mean, 90th, and 99th percentile price values
are computed against all products that are in stock ( q=*:* and fq=inStock:true), and independently all of
the default statistics are computed against all products regardless of whether they are in stock or not (by
excluding that filter).
http://localhost:8983/solr/techproducts/select?q=*:*&fq={!tag=stock_check}inStock:
true&stats=true&stats.field={!ex=stock_check+key=instock_prices+min=true+max=true+
mean=true+percentiles='90,99'}price&stats.field={!key=all_prices}price&rows=0&inde
nt=true
0.0
2199.0
328.20437693595886
564.9700012207031
1966.6484985351556
0.0
2199.0
12
5
4089.880027770996
5385249.921747174
340.823335647583
602.3683083752779
The Stats Component and Faceting
Apache Solr Reference Guide 6.0
389