[jira] Commented: (SOLR-741) Add support for rounding dates in DateField

["Hoss Man (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12835008#action_12835008 ] 

Hoss Man commented on SOLR-741:
-------------------------------

bq. With the introduction of Trie fields is it not irrelevant now? can we close it 

TrieFields make it more efficient to do range searches on numeric fields indexed at full precision, but it doesn't actually do anything to round the fields for people who genuinely want their stored and index values to only have second/minute/hour/day precision regardless of what the initial raw data looks like.

So while TrieFields definitely make this less of a priority from a performance standpoint, it doens't solve hte full problem.

(Unless i'm missing something, actually rounding the values prior to indexing will still help improve performance in general because it will reduce the total number of Terms ... with TrieFields isn't the original value is always indexed regardless of the precisionStep?

> 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: 1.5
>
>
> 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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