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https://issues.apache.org/jira/browse/GORA-195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13545948#comment-13545948
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Alfonso Nishikawa commented on GORA-195:
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Hi, Ferdy.
Thanks for resuming all in those two options :)
I suggest at least your option a) to throw and exception, but I wish we
implement (or maybe should speak in singular;) option b), since at this moment
it is possible map an Array/Map to a family:column wrapping (workaround) it in
a record.
When working with objects with wrapped Arrays/Maps, sourcecode gets dirty since
you have to check if the wrapper is Null/not null, and then access the
Array/Map, etc.
This is a low importance issue. No votes, as I can see at left column ;)
> [gora-hbase] Allow mapping of an array to a single column
> ---------------------------------------------------------
>
> Key: GORA-195
> URL: https://issues.apache.org/jira/browse/GORA-195
> Project: Apache Gora
> Issue Type: Improvement
> Components: storage-hbase
> Affects Versions: 0.2.1
> Environment: HBase 0.90.4 backend, Hadoop 1.0.1
> Reporter: Alfonso Nishikawa
> Priority: Trivial
>
> At this time, defining a mapping in HBase for an array field to a
> family:column like this:
> {code}
> {"name": "A",
> "fields": [
> {"name": "field", "type": {"type": "array", "values": "string"}}
> ]
> }
> <class name="A" ...>
> <field name="field" family="r" qualifier="c"/>
> </class>
> {code}
> in HBase is discouraging since gets to an unexpected behavior loading parts
> of the rest of the record.
> So: by now only is allowed mappings of arrays(and maps) to families.
> Workaround: enclose the array inside an inner optional record like this:
> {code}
> {"name": "A",
> "fields": [
> {"name":"holder", "type:" ["null", {
> "name":"holderRecord",
> "type":"record",
> "fields": [
> {"name": "field", "type": {"type": "array",
> "values": "string"}}
> ]
> }}
> ]
> }
> {code}
> The necessity comes partially if you don't want to create a family for each
> array in you HBase database (advised not to do), or if you just want to map
> to a column when your array is read-only.
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