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https://issues.apache.org/jira/browse/SOLR-9665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15623462#comment-15623462
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David Smiley commented on SOLR-9665:
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If the field is numeric (not a String that happens to contain a number), then
the "JSON Facet API" will interpret the "index" sort order as the numeric sort
of the field value. I just verified it worked:
http://localhost:8983/solr/techproducts/select?json.facet.price.terms.field=price&json.facet.price.terms.sort=index&indent=on&q=*:*&rows=1&wt=json
(in that example, it's a coincidence of the example data that it's the same as
count order)
Docs: https://cwiki.apache.org/confluence/display/solr/Faceted+Search
p.s. yes it's a shame we have multiple faceting modules, which is confusing to
users. In time I hope JSON Facet API takes over.
> Facet Values Sort Order: Add 3rd choice: Numeric Sort
> -----------------------------------------------------
>
> Key: SOLR-9665
> URL: https://issues.apache.org/jira/browse/SOLR-9665
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Components: faceting
> Reporter: Luke P Warwick
>
> As a person, I need facet values to be in predictable, intuitive spots so
> that I can quickly and easily find the values that are appropriate to me.
> Problem Statement: Today Solr has two default facet sort orders, neither of
> which provides predictable, intuitive facet value orders for people when the
> values start with numbers.
> Goal: Address the problem where index sorts facet values how a computer would
> rather than how a human would. This is very problematic for E-commerce
> facets like 'size' and 'tire width'
> Acceptance Criteria:
> 1. Sorts facet values numerically from lowest to highest
> 2. Works with both numeric and string fields (thus working on values that
> include letters... 25 mm, 30 waist, 32 Waist, 4 Petite)
> 3. If facet values don't start with a number, they are sorted alphabetically,
> after all values that do start with a number
> 4. If facet values are equal numerically, sort the numerically equal values
> alphabetically. Example: 10,10 Petite,10 Tall,12, Petite, 12 Tall
> 5. Integers and Floats are supported (even if string field)
> Examples:
> Women's Pants Sizes:
> 8
> 8 Tall
> 10
> 10 Petite
> 10 Tall
> 12
> 12 Tall
> 14 Petite
> 26 Waist
> 28 Waist
> 30 Waist
> One Size
> Bike Wheel Sizes:
> 20 Inches
> 24 Inches
> 26 Inches
> 27 Inches
> 27.5 Inches
> 27.5+ Inches
> 29 Inches
> 650c
> 700c
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