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https://issues.apache.org/jira/browse/IOTDB-340?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jialin Qiao closed IOTDB-340.
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Fix Version/s: 0.10.0-SNAPSHOT
Resolution: Fixed
> Remove unnecessary getting data types from MManager when querying
> -----------------------------------------------------------------
>
> Key: IOTDB-340
> URL: https://issues.apache.org/jira/browse/IOTDB-340
> Project: Apache IoTDB
> Issue Type: Improvement
> Reporter: Jialin Qiao
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.10.0-SNAPSHOT
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> In a QueryPlan, the selected paths with data types, predicates (expression)
> are included.
> {code:java}
> private List<Path> paths;
> private List<TSDataType> dataTypes;
> private IExpression expression;
> {code}
> However, when executing a QueryPlan in the AbstractQueryProcessExecutor, only
> paths and expression are passed to the EngineQueryRouter through
> QueryExpression.
> Therefore, the data type information is lost and needs to get from manager
> again, which is a waste.
> It's better to pass the full QueryPlan to the EngineQueryRouter for all query
> types: raw data query, fill query, group by query, aggregation query.
> The QueryExpression is a parameter in the query interface of TsFile, we do
> not need to use it in the server, because we could get more information on
> the server.
>
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