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https://issues.apache.org/jira/browse/CALCITE-444?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde updated CALCITE-444:
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Summary: Filters wrongly pushed into full outer join (was: Outer Join
simplification is wrong and results in incorrect results)
> Filters wrongly pushed into full outer join
> -------------------------------------------
>
> Key: CALCITE-444
> URL: https://issues.apache.org/jira/browse/CALCITE-444
> Project: Calcite
> Issue Type: Bug
> Reporter: Laljo John Pullokkaran
> Assignee: Laljo John Pullokkaran
> Attachments: CALCITE-444.1.patch, CALCITE-444.patch
>
>
> Filter R1.x=10 (R1 full outer join R2 on R1.y=R2.y)
> Gets rewritten as
> R1 left outer join R2 on R1.y=R2.y and R1.x=10.
> This is obviously wrong and produces wrong result.
> select count(*) from(select ss.ss_sold_date_sk, ss.ss_item_sk,
> ss.ss_customer_sk from store_sales ss full outer join date_dim d on
> ss.ss_sold_date_sk = d.d_date_sk where ss.ss_item_sk = 4496)R;
> produces wrong result due to above described problem.
> Patch separates the join simplification from Join filter classification.
> Predicate Push Down through Join would first simplify Outer Joins before
> applying predicate push down.
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