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Robert Stupp edited comment on CASSANDRA-7396 at 9/13/14 11:09 AM:
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I'm currently testing whether a kind of "CellFilter" works for this. Such a
"CellFilter" could be used in {{SelectStatement#addValue}} to pre-select only
those elements, that shall be part of the result set. This would reduce the
serialization overhead - and it can also be used to optimize for list slice
requests. Altogether this would be the "general purpose" optimization for slice
requests.
Additionally there could be more optimizations in terms of column-slicing,
which IMO could work for sets and maps but not for lists.
EDIT: branch updated with changed for "CellFilter" - works fine
EDIT2: removed {{?}} syntax
was (Author: snazy):
I'm currently testing whether a kind of "CellFilter" works for this. Such a
"CellFilter" could be used in {{SelectStatement#addValue}} to pre-select only
those elements, that shall be part of the result set. This would reduce the
serialization overhead - and it can also be used to optimize for list slice
requests. Altogether this would be the "general purpose" optimization for slice
requests.
Additionally there could be more optimizations in terms of column-slicing,
which IMO could work for sets and maps but not for lists.
EDIT: branch updated with changed for "CellFilter" - works fine
> Allow selecting Map key, List index
> -----------------------------------
>
> Key: CASSANDRA-7396
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7396
> Project: Cassandra
> Issue Type: New Feature
> Components: API
> Reporter: Jonathan Ellis
> Assignee: Robert Stupp
> Labels: cql
> Fix For: 3.0
>
>
> Allow "SELECT map['key]" and "SELECT list[index]." (Selecting a UDT subfield
> is already supported.)
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