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https://issues.apache.org/jira/browse/GORA-138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13278281#comment-13278281
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Kazuomi Kashii commented on GORA-138:
-------------------------------------
super column name : string : field name
column name : int : index of array
column value : primitive : element value
Currently, StringSerializer is used for column name for other purposes at
gora-cassandra,
so it must be changed to ByteBufferSerializer, and some classes such as
CassandraClient and CassandraSuperColumn need to take care like GORA-132 for
column value.
> gora-cassandra array type support
> ----------------------------------
>
> Key: GORA-138
> URL: https://issues.apache.org/jira/browse/GORA-138
> Project: Apache Gora
> Issue Type: New Feature
> Components: storage-cassandra
> Reporter: Kazuomi Kashii
>
> In order to support ARRAY in gora-cassandra, we have two scenarios as follows:
> 1) super column family like the current MAP implementation; or
> 2) single column to store all elements of ARRAY.
> Each senario has pros and cons, but I'd prefer 1) and I have implemented a
> prototype.
> 1) super column family
> ** pros
> - consistent with MAP
> - each column stores primitive type value.
> ** cons
> - ARRAY cannot be contained in RECORD or MAP.
> 2) single column
> ** pros
> - complex type such as RECORD and MAP can have ARRAY value.
> ** cons
> - large size of ARRAY requres a huge single column value.
> - difficult to implement for STRING and BYTES (variable length).
> Currently, super column is used for other complex types such as RECORD and
> MAP,
> so it is consistent to use super column for ARRAY.
> Considering this, the rule that complex type cannot have complex type value
> seems a reasonable limitation, and it makes rule simple.
> If we take 1) senario with super column family,
> I can provide a patch of my implementation.
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