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Posted to issues@drill.apache.org by "Parth Chandra (JIRA)" <ji...@apache.org> on 2015/04/21 22:05:59 UTC
[jira] [Updated] (DRILL-280) Multiple tables join may get join
sequence where two tables joined do not have any join condition.
[ https://issues.apache.org/jira/browse/DRILL-280?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Parth Chandra updated DRILL-280:
--------------------------------
Component/s: Execution - Relational Operators
> Multiple tables join may get join sequence where two tables joined do not have any join condition.
> ----------------------------------------------------------------------------------------------------
>
> Key: DRILL-280
> URL: https://issues.apache.org/jira/browse/DRILL-280
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Relational Operators
> Reporter: Jinfeng Ni
> Assignee: Jinfeng Ni
> Priority: Critical
> Fix For: 0.4.0
>
>
> When we have > 2 tables joined together, if we put the join predicates in the WHERE clause, the query may get a join sequence where two tables joined together do not have any join condition. This will lead to error in Merge Join OP, which assume join always have a join condition.
> For example, the following query:
> SELECT S.S_ACCTBAL, S.S_NAME
> FROM
> ( SELECT _MAP['P_PARTKEY'] as P_PARTKEY,
> _MAP['P_MFGR'] as P_MFGR
> FROM "/Users/jni//work/tpc-h-parquet/part") P,
> ( SELECT _MAP['S_SUPPKEY'] AS S_SUPPKEY,
> _MAP['S_NATIONKEY'] AS S_NATIONKEY,
> _MAP['S_ACCTBAL'] AS S_ACCTBAL,
> _MAP['S_NAME'] AS S_NAME,
> _MAP['S_ADDRESS'] AS S_ADDRESS,
> _MAP['S_PHONE'] AS S_PHONE,
> _MAP['S_COMMENT'] AS S_COMMENT
> FROM "/Users/jni//work/tpc-h-parquet/supplier") S,
> (SELECT _MAP['PS_PARTKEY'] AS PS_PARTKEY,
> _MAP['PS_SUPPKEY'] AS PS_SUPPKEY
> FROM "/Users/jni//work/tpc-h-parquet/partsupp") PS
> WHERE P.P_PARTKEY = PS.PS_PARTKEY and
> S.S_SUPPKEY = PS.PS_SUPPKEY
> LIMIT 100;
> The join sequence in logical and physical plan is : P -> S -> PS. However, since there is no direct predicate between P and S, the Merge Join between P and S will have no join conditions. This lead to the following error in MergeJoinBatch.java:
> "Failure while setting up Foreman. < ArrayIndexOutOfBoundsException:[ 0 ]
> Since almost all TPC-H queries have multiple tables joins, it's important that we get this issue resolved, in order to run TPC-H queries.
>
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