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https://issues.apache.org/jira/browse/HIVE-6955?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Harish Butani updated HIVE-6955:
--------------------------------
Status: Patch Available (was: Open)
> ExprNodeColDesc isSame doesn't account for tabAlias: this affects trait
> Propagation in Joins
> --------------------------------------------------------------------------------------------
>
> Key: HIVE-6955
> URL: https://issues.apache.org/jira/browse/HIVE-6955
> Project: Hive
> Issue Type: Bug
> Reporter: Harish Butani
> Assignee: Harish Butani
> Attachments: HIVE-6955.1.patch
>
>
> For tpcds Q15:
> {code}
> explain
> select ca_zip, sum(cs_sales_price)
> from catalog_sales, customer, customer_address, date_dim
> where catalog_sales.cs_bill_customer_sk = customer.c_customer_sk
> and customer.c_current_addr_sk = customer_address.ca_address_sk
> and (substr(ca_zip,1,5) in ('85669', '86197','88274','83405','86475',
> '85392', '85460', '80348', '81792')
> or ca_state in ('CA','WA','GA')
> or cs_sales_price > 500)
> and catalog_sales.cs_sold_date_sk = date_dim.d_date_sk
> and d_qoy = 2 and d_year = 2001
> group by ca_zip
> order by ca_zip
> limit 100;
> {code}
> The Traits setup for the Operators are:
> {code}
> FIL[23]: bucketCols=[[]],numBuckets=-1
> RS[11]: bucketCols=[[VALUE._col0]],numBuckets=-1
> JOIN[12]: bucketCols=[[_col71], [_col71]],numBuckets=-1
> FIL[13]: bucketCols=[[_col71], [_col71]],numBuckets=-1
> SEL[14]: bucketCols=[[_col71], [_col71]],numBuckets=-1
> GBY[15]: bucketCols=[[_col0]],numBuckets=-1
> RS[16]: bucketCols=[[KEY._col0]],numBuckets=-1
> GBY[17]: bucketCols=[[_col0]],numBuckets=-1
> SEL[18]: bucketCols=[[_col0]],numBuckets=-1
> LIM[21]: bucketCols=[[_col0]],numBuckets=-1
> FS[22]: bucketCols=[[_col0]],numBuckets=-1
> TS[3]: bucketCols=[[]],numBuckets=-1
> RS[5]: bucketCols=[[VALUE._col0]],numBuckets=-1
> JOIN[6]: bucketCols=[[_col3], [_col36]],numBuckets=-1
> RS[7]: bucketCols=[[VALUE._col40]],numBuckets=-1
> JOIN[9]: bucketCols=[[_col40], [_col0]],numBuckets=-1
> RS[10]: bucketCols=[[VALUE._col0]],numBuckets=-1
> TS[1]: bucketCols=[[]],numBuckets=-1
> RS[8]: bucketCols=[[VALUE._col0]],numBuckets=-1
> TS[0]: bucketCols=[[]],numBuckets=-1
> RS[4]: bucketCols=[[VALUE._col3]],numBuckets=-1
> {code}
> This is incorrect:
> Join[9] joins ca join (cs join cust). In this case both sides of join have a
> '_col0' column. The reverse mapping of trait propagation relies on
> ExprNodeColumnDesc.isSame; since this doesn't account for the tabAlias we end
> up with Join[9] being bucketed on cs_sold_date_sk; Join[12] has the same
> issue, only compounds the error.
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