Hoss Man created SOLR-10157:
-------------------------------
Summary: 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)
Reporter: Hoss Man
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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