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https://issues.apache.org/jira/browse/CASSANDRA-21374?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitry Konstantinov updated CASSANDRA-21374:
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Description:
If we have a large result set (like a full page in 5k rows) then when we
populate org.apache.cassandra.cql3.ResultSet#rows from an iterator we have to
copy the values again and again when we extend the list.
It is tricky to get the result size in advance.
As an option, instead of ArrayList we can use a custom data structure - chunked
array list, when we append fixed size chunks and fill them with elements.
was:
If we have a large result set (like a full page in 5k rows) then when we
populate org.apache.cassandra.cql3.ResultSet#rows from an iterator we have to
copy the values again and again when we extend the list.
It is tricky to get the result size in advance.
As an option, instead of ArrayList we can use a custom data structure - chunked
array list, when we append fixed size chunks when we fill it with elements.
> Introduce Chunk list in ResultSet to avoid full copy for a large select result
> ------------------------------------------------------------------------------
>
> Key: CASSANDRA-21374
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21374
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: CQL/Interpreter
> Reporter: Dmitry Konstantinov
> Assignee: Dmitry Konstantinov
> Priority: Normal
>
> If we have a large result set (like a full page in 5k rows) then when we
> populate org.apache.cassandra.cql3.ResultSet#rows from an iterator we have to
> copy the values again and again when we extend the list.
> It is tricky to get the result size in advance.
> As an option, instead of ArrayList we can use a custom data structure -
> chunked array list, when we append fixed size chunks and fill them with
> elements.
>
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