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https://issues.apache.org/jira/browse/SOLR-741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12646407#action_12646407
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Hoss Man commented on SOLR-741:
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bq. An average user may not very familiar w/ Date Math syntax .
but if they're doing enough stuff with dates that they're worried about the
precision they probably ought to be.
that said: a more straight forward "precision" option would certainly be better
then forcing the user to know the Date Math Parser syntax if all we are
supporting rounding down ... my previous suggestion was mainly along the lines
of "if we want to support both rounding down or up, or support rounding to an
interval (ie: 5 minutes) let's add those features to Date Math and reuse that
syntax"
> Add support for rounding dates in DateField
> -------------------------------------------
>
> Key: SOLR-741
> URL: https://issues.apache.org/jira/browse/SOLR-741
> Project: Solr
> Issue Type: Improvement
> Components: search
> Affects Versions: 1.4
> Reporter: Shalin Shekhar Mangar
> Priority: Minor
> Fix For: 1.4
>
>
> As discussed at http://www.nabble.com/Rounding-date-fields-td19203108.html
> Since rounding dates to a coarse value is an often recommended solution to
> decrease number of unique terms, we should add support for doing this in
> DateField itself. A number of syntax were proposed, some of them were:
> # <fieldType name="date" class="solr.DateField"
> sortMissingLast="true"omitNorms="true" roundTo="-1MINUTE" /> (Shalin)
> # <fieldType name="date" class="solr.DateField" sortMissingLast="true"
> omitNorms="true" round="DOWN_MINUTE" /> (Otis)
> Hoss proposed more general enhancements related to arbitary pre-processing of
> values prior to indexing/storing using pre-processing analyzers.
> This issue aims to build a consensus on the solution to pursue and to
> implement that solution inside Solr.
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