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Posted to dev@iotdb.apache.org by "Jialin Qiao (Jira)" <ji...@apache.org> on 2020/01/21 13:49:00 UTC
[jira] [Closed] (IOTDB-433) Add iterators to TVList to prevent data
copy in query
[ https://issues.apache.org/jira/browse/IOTDB-433?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jialin Qiao closed IOTDB-433.
-----------------------------
Resolution: Fixed
> Add iterators to TVList to prevent data copy in query
> -----------------------------------------------------
>
> Key: IOTDB-433
> URL: https://issues.apache.org/jira/browse/IOTDB-433
> Project: Apache IoTDB
> Issue Type: Improvement
> Reporter: atoildw
> Assignee: atoildw
> Priority: Major
> Fix For: 0.10.0-SNAPSHOT
>
>
> In the previous design, when you used in-memory data:
> # the {{TVList}} structure was {{clone}} into an {{IWritableMemChunk}} named {{chunkCopy}}
> # And then copied again into a {{List<TimeValuePair>}} structure
> # If multiple data happens to exist in {{flushingMemTable}}, {{MemSeriesLazyMerger}} will use {{addAll(List<TimeValuePair>)}} to copy again
> so, I think we should directly use {{TVList}} to implement {{IPointReader}} interface and use it externally
> Add the {{Iterator}} class and {{getIterator}} method for {{TVlist}}
> and then ,data was copied only when it is used
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