[Bug 21836] New: Remove NotSupportedError on creating index for multiEntry index with array keyPath

https://www.w3.org/Bugs/Public/show_bug.cgi?id=21836

            Bug ID: 21836
           Summary: Remove NotSupportedError on creating index for
                    multiEntry index with array keyPath
    Classification: Unclassified
           Product: WebAppsWG
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Indexed Database API
          Assignee: dave.null@w3.org
          Reporter: kyawtun@yathit.com
        QA Contact: public-webapps-bugzilla@w3.org
                CC: mike@w3.org, public-webapps@w3.org

In creating index, the specification state that:

"If keyPath is and Array and the multiEntry
property in the optionalParameters is true, then a DOMException of type
NotSupportedError must be thrown."

However it is unnecessary. multiEntry is no different than
non-multiEntry index value, except the reference value is repeated. This
specification limit generalizes usage of composite index for key joining
algorithm.

Composite index with multiEntry is very useful, like modelling graph data
and many-to-many relationship. Currently query on such model are limited to
single index. It is also very unlikely that web developer will use excessive
indexing.

Discussion on:
http://lists.w3.org/Archives/Public/public-webapps/2013AprJun/0379.html

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Received on Friday, 26 April 2013 00:53:19 UTC