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https://issues.apache.org/jira/browse/HIVE-2470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13119123#comment-13119123
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jirapos...@reviews.apache.org commented on HIVE-2470:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/2078/
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(Updated 2011-10-03 01:31:21.490736)
Review request for hive, Carl Steinbach, John Sichi, and Igor Kabiljo.
Changes
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Take suggestions after discussion with ikabiljo and jvs. Get rid of
constantfoldablegenericudf in favor of just having both the exprnode evaluator
and desc initialize /w constant folding and cache values for all non-stateful,
deterministic generic udfs.
Summary
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ConstantObjectInspectors were introduced in a previous patch so that UDF's
could have access to constant values at initialize time. This diff adds the
following improvements:
1.) Extends this functionality beyond primitive types to List/Map types.
2.) Fixes a bug in ExprNodeGenericFuncDesc where the constant value would not
propagate beyond one level of evaluation.
3.) Adds a helper class to make functions constant-aware. By inheriting from
this class they return constant OIs if all their arguments are constant, and
they cache the result so that computation is only done during initialize().
Some functions such as ARRAY/IF/MAP have been migrated.
This addresses bug HIVE-2470.
https://issues.apache.org/jira/browse/HIVE-2470
Diffs (updated)
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ql/src/java/org/apache/hadoop/hive/ql/exec/ExprNodeGenericFuncEvaluator.java
ebc236d
ql/src/java/org/apache/hadoop/hive/ql/plan/ExprNodeGenericFuncDesc.java
7da5d6a
ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDF.java 570e408
ql/src/test/queries/clientpositive/constant_prop.q PRE-CREATION
ql/src/test/results/clientpositive/constant_prop.q.out PRE-CREATION
serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/ObjectInspectorFactory.java
a4689fb
serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/ObjectInspectorUtils.java
2c1a7e0
serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/StandardConstantListObjectInspector.java
PRE-CREATION
serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/StandardConstantMapObjectInspector.java
PRE-CREATION
Diff: https://reviews.apache.org/r/2078/diff
Testing
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ant test
Thanks,
Jonathan
> Improve support for Constant Object Inspectors
> ----------------------------------------------
>
> Key: HIVE-2470
> URL: https://issues.apache.org/jira/browse/HIVE-2470
> Project: Hive
> Issue Type: Improvement
> Reporter: Jonathan Chang
> Assignee: Jonathan Chang
> Attachments: HIVE-1360.part2.patch, HIVE-2470.patch
>
>
> ConstantObjectInspectors are nice but they need to be more widely supported
> and used. In particular,
> * More functions need to be using them.
> * There need to be facilities for propagating constness.
> * Support for complex types must be added.
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