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https://issues.apache.org/jira/browse/HIVE-8280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14161367#comment-14161367
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Harish Butani commented on HIVE-8280:
-------------------------------------
Other ops are handled by RelMdUniqueKeys.
will remove tail recursion: (i was thinking scala)
> CBO : When filter is applied on dimension table PK/FK code path is not in
> effect.
> ---------------------------------------------------------------------------------
>
> Key: HIVE-8280
> URL: https://issues.apache.org/jira/browse/HIVE-8280
> Project: Hive
> Issue Type: Bug
> Components: CBO
> Affects Versions: 0.14.0
> Reporter: Mostafa Mokhtar
> Assignee: Harish Butani
> Fix For: 0.14.0
>
> Attachments: HIVE-8280.1.patch
>
>
> When a filter is applied on PK side joins don't qualify as PK/FK join.
> In getUniqueKeys when a filter is applied on the table the child is no
> longer a table scan.
> {code}
> public Set<BitSet> getUniqueKeys(ProjectRelBase rel, boolean ignoreNulls) {
> RelNode child = rel.getChild();
> if (!(child instanceof HiveTableScanRel)) {
> Function<RelNode, Metadata> fn = RelMdUniqueKeys.SOURCE.apply(
> rel.getClass(), BuiltInMetadata.UniqueKeys.class);
> return ((BuiltInMetadata.UniqueKeys) fn.apply(rel))
> .getUniqueKeys(ignoreNulls);
> }
> {code}
> Repro
> {code}
> with ss as
> (select
> ss_customer_sk, ss_item_sk, ss_ticket_number
> from
> store_sales,
> store
> where
> s_store_sk = ss_store_sk
> and s_market_id = 4),
> sr as
> (select sr_customer_sk,sr_item_sk ,sr_ticket_number from store_returns, store
> where s_store_sk = sr_store_sk and s_market_id=4)
> select
> count(*)
> from
> ss,
> sr
> where
> ss_customer_sk = sr_customer_sk
> and ss_item_sk = sr_item_sk
> and ss_ticket_number = sr_ticket_number;
> {code}
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