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https://issues.apache.org/jira/browse/SOLR-10157?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Cassandra Targett updated SOLR-10157:
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Component/s: Facet Module
> JSON Facets should give more helpful error msg when users attempt to an
> unknown aggregation
> -------------------------------------------------------------------------------------------
>
> Key: SOLR-10157
> URL: https://issues.apache.org/jira/browse/SOLR-10157
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Facet Module
> Reporter: Hoss Man
> Priority: Major
>
> Sample question from a confused solr-user email...
> {noformat}
> > I'm getting this error when I tried to do a division in JSON Facet.
> >
> > "error":{
> > "msg":"org.apache.solr.search.SyntaxError: Unknown aggregation agg_div
> > in ('div(4,2)', pos=4)",
> > "code":400}}
> >
> >
> > Is this division function supported in JSON Facet?
> {noformat}
> And the subsequent followup from the same user...
> bq. I found that we can't put div(4,2) directly, as it wouldn't work.
> bq. It will work if I put something like max(div(4,2)).
> ----
> It seems like a better error handline code path for
> {{FunctionQParser.parseAgg}} (once we've confirmed no such aggregation
> exists) would be:
> * attempt to parse the original string as a regular (non-Agg)ValueSource)
> function
> ** if that succeeds, give the user an error indicating that this ValueSource
> must be wrapped in an aggregation
> ** if it fails, continue to throw the original error
> * either way, any error thrown should refer to the _original_ {{id}} before
> For example:
> * {{div(price,popularity)}} should throw an error with a msg along the lines
> of: {{'div' is a per-document function, not a multi-document aggregation
> function, input: div(price,popularity)}}
> * {{HOSS(price,popularity)}} on the other hand should throw an error such
> as: {{Unknown aggregation HOSS in ('HOSS(price,populaity)' ...}}
> ** note the message cites {{HOSS}} not {{agg_HOSS}}
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