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https://issues.apache.org/jira/browse/IMPALA-2112?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on IMPALA-2112 started by Anurag Mantripragada.
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> Support primary key/foreign key constraint as part of create table in Impala
> ----------------------------------------------------------------------------
>
> Key: IMPALA-2112
> URL: https://issues.apache.org/jira/browse/IMPALA-2112
> Project: IMPALA
> Issue Type: Sub-task
> Components: Catalog, Frontend
> Affects Versions: Impala 2.2
> Reporter: Marcel Kinard
> Assignee: Anurag Mantripragada
> Priority: Critical
> Labels: planner
>
> These would be advisory, ie, Impala would not attempt to enforce them.
> However, they could be used for cardinality estimation during query planning.
> To be compatible with Hive:
> * We neither enforce or validate integrity constraints. Hence, DISABLE and
> NOVALIDATE options are mandatory.
> * RELY/NORELY is optional. The CBO is expected to use this information when
> a user specifies “RELY”. The default is NORELY.
> * Since we do not yet have UNIQUE in Hive, the FK mentioned must be Primary
> Key column in parent table.
> Support create table syntax like hive does:
> * {{create table pk(id1 integer, id2 integer, }}{{primary key(id1, id2)
> DISABLE NOVALIDATE);}}
> * {{create table fk(id1 integer, id2 integer, }}{{constraint c1 foreign
> key(id1, id2) references pk(id2, id1) DISABLE NOVALIDATE);}}
> * {{create table T1(id integer, name string, primary key(id) DISABLE
> NOVALIDATE RELY}}
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