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https://issues.apache.org/jira/browse/HIVE-26371?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HIVE-26371:
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Labels: pull-request-available (was: )
> Constant propagation does not evaluate constraint expressions at merge when
> CBO is enabled
> ------------------------------------------------------------------------------------------
>
> Key: HIVE-26371
> URL: https://issues.apache.org/jira/browse/HIVE-26371
> Project: Hive
> Issue Type: Bug
> Components: CBO, Logical Optimizer
> Reporter: Krisztian Kasa
> Assignee: Krisztian Kasa
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> {code}
> CREATE TABLE t_target(
> name string CHECK (length(name)<=20),
> age int,
> gpa double CHECK (gpa BETWEEN 0.0 AND 4.0))
> stored as orc TBLPROPERTIES ('transactional'='true');
> CREATE TABLE t_source(
> name string,
> age int,
> gpa double);
> insert into t_source(name, age, gpa) values ('student1', 16, null);
> insert into t_target(name, age, gpa) values ('student1', 16, 2.0);
> merge into t_target using t_source source on source.age=t_target.age when
> matched then update set gpa=6;
> {code}
> Currently CBO can not handle constraint checks when merging so the filter
> operator with the {{enforce_constraint}} call is added to the Hive operator
> plan after CBO is succeeded and {{ConstantPropagate}} optimization is called
> only from TezCompiler with {{ConstantPropagateOption.SHORTCUT}}.
> With this option {{ConstantPropagate}} does not evaluate deterministic
> functions.
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