Hoss Man created SOLR-6574:
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Summary: new ValueSources & parser syntax for "coercing" the
datatypes used in wrapped ValueSources
Key: SOLR-6574
URL: https://issues.apache.org/jira/browse/SOLR-6574
Project: Solr
Issue Type: Improvement
Reporter: Hoss Man
Something i've been thinking about for a while, but SOLR-6562 recently goaded
me into opening a jira for...
we could/should add ValueSourceParses for "coercing" the datatypes of the
ValueSources that they wrap, as a way of contorlling wether we ultimately call
FunctionValues.floatValue(docid) vs intValue(docid) vs longValue(docid) etc...
so while "sum(field1, field2)" currently does float based math on the two
fields, we could use "int(sum(field1, field2))" which would create some new
"CoerceIntValueSource" that would wrap the existing SumValueSource, and every
type specific method in CoerceIntValueSource's FunctionValues would delegate to
SumValueSource's intValue method -- and likewise: CoerceIntValueSource's
objectVal() method would return an Integer wrapped arround the results of the
intValue(docid).
(FWIW: i think a bunch of the existing "math" based FunctionValues currently
implement most of their methods like intValue/longValue/doubleValue/etc... by
just delegating to floatValue -- so for this to work properly that would have
to be fixed as well, but those fixes can & should be tracked in their own jiras)
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