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https://issues.apache.org/jira/browse/IMPALA-14575?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Balazs Hevele reassigned IMPALA-14575:
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Assignee: Balazs Hevele
> Optimize constants in HiveUdfCall
> ---------------------------------
>
> Key: IMPALA-14575
> URL: https://issues.apache.org/jira/browse/IMPALA-14575
> Project: IMPALA
> Issue Type: Sub-task
> Components: Backend, Frontend
> Reporter: Csaba Ringhofer
> Assignee: Balazs Hevele
> Priority: Major
>
> Hive can signal to a UDF that an argument is constant with
> ConstantObjectInspector:
> https://github.com/apache/hive/blob/d9ec04156d84bedbaa9f8dc40c27dbb88a3b9f49/serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/ObjectInspectorUtils.java#L1440
> https://github.com/apache/hive/blob/d9ec04156d84bedbaa9f8dc40c27dbb88a3b9f49/serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/ObjectInspectorUtils.java#L1512
> This is used by st_ relation functions to optimize the common case of
> comparing many geometries to a constant geometry:
> https://github.com/apache/hive/blob/d9ec04156d84bedbaa9f8dc40c27dbb88a3b9f49/ql/src/java/org/apache/hadoop/hive/ql/udf/esri/ST_GeometryRelational.java#L93
> Impala knows in c++ whether an argument is constant, but this information is
> not passed to the Java side:
> https://github.com/apache/impala/blob/2ac5a24dc0cfc9c9e7a1fc86cccf94cd1a2900af/common/thrift/Frontend.thrift#L41
> Optimizing constants could help by:
> - passing the argument from cpp to Java only once
> - allowing const aware optimizations in UDFs
> TODO:
> only checked generic UDFs, not sure if this exists for legacy UDFs
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