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https://issues.apache.org/jira/browse/IOTDB-743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17125943#comment-17125943
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Xiangdong Huang commented on IOTDB-743:
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Hi Julian, can you provide more detail examples?
> Use Runtime Code-Generation to improve speed and efficiency of Queries
> ----------------------------------------------------------------------
>
> Key: IOTDB-743
> URL: https://issues.apache.org/jira/browse/IOTDB-743
> Project: Apache IoTDB
> Issue Type: New Feature
> Components: Core/Engine, Core/TsFile
> Reporter: Julian Feinauer
> Priority: Major
>
> Many Databases and ohter Open Source projects that have to handle big chunks
> of "similar" Data in one query use some sort of code-generation (e.g. Apache
> Calcite, Apache Drill, Apache Spark, Postgres since 10.0, ...).
> Generally, the idea is that its more efficient to create custom "Reader" or
> even "Calculator" classes that are applied to each Row of a query. Although
> there is initial cost of assembling the code and compiling it but this will
> pay out in the long run as you save time for each row due to more efficient
> generated code and fewer branching.
> This could even make sense on TsFile Level if for a specific read operation
> the exact shema that one wants to read is known and then fix we could
> genreate specific code to only read that schema.
> Altough one should also consider suitable benchmarks to estimate how much
> efficiently that brings and ideally only activate that feature when the
> optimizer decides that it may be beneficial.
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