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https://issues.apache.org/jira/browse/SOLR-11706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16271695#comment-16271695
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Yonik Seeley commented on SOLR-11706:
-------------------------------------
Perhaps a bug at the user level, but more of a "not implemented yet" at the
development level.
bq. Based on the stack traces, i gather the problem is because the FacetModule
seems to rely exclusively on using the "Function" parsers to get a value source
– apparently w/o any other method of accumulating numeric stats from
multivalued (numeric) DocValues?
That was the original reason. As part of SOLR-11317 I added a bit of a hacky
way to support a function or a bare field name (w/o trying to make the field
name into a value source).
min/max parsers currently use this:
{code}
addParser("agg_min", new ValueSourceParser() {
@Override
public ValueSource parse(FunctionQParser fp) throws SyntaxError {
return new MinMaxAgg("min",
fp.parseValueSource(FunctionQParser.FLAG_DEFAULT |
FunctionQParser.FLAG_USE_FIELDNAME_SOURCE));
}
});
{code}
Now in MinMaxAgg, we deal with fields separately from functions and throw an
exception for a multivalued field since there is no implementation yet:
{code}
if (sf.multiValued() || sf.getType().multiValuedFieldCache()) {
vs = null;
throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, "min/max
aggregations can't be used on multi-valued field " + field);
{code}
We could either:
- use the same strategy for all the stats (fine if we only care about
multi-valued fields and not multi-valued functions)
- fix ValueSource so that it can be truly multi-valued and use that
> JSON FacetModule can't compute stats (min,max,etc...) on multivalued fields
> ---------------------------------------------------------------------------
>
> Key: SOLR-11706
> URL: https://issues.apache.org/jira/browse/SOLR-11706
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Hoss Man
>
> While trying to write some tests demonstrating equivalences between the
> StatsComponent and the JSON FacetModule i discovered that the FacetModules
> stat functions (min, max, etc...) don't seem to work on multivalued fields.
> Based on the stack traces, i gather the problem is because the FacetModule
> seems to rely exclusively on using the "Function" parsers to get a value
> source -- apparently w/o any other method of accumulating numeric stats from
> multivalued (numeric) DocValues?
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