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https://issues.apache.org/jira/browse/HIVE-4684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13712999#comment-13712999
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Jitendra Nath Pandey commented on HIVE-4684:
--------------------------------------------
There are two issues here :
1) If the left expression is constant and right expression is a generic
function, the query doesn't vectorize because corresponding vector expressions
are missing.
2) If the left expression is constant and right is a column expression, the
query vectorizes to an incorrect expression with column on left, which won't
work for non-commutative expressions.
The latest patch includes the missing expressions that addresses (1) and also a
one line fix in VectorizationContext that fixes (2).
> Query with filter constant on left of "=" and column expression on right does
> not vectorize
> -------------------------------------------------------------------------------------------
>
> Key: HIVE-4684
> URL: https://issues.apache.org/jira/browse/HIVE-4684
> Project: Hive
> Issue Type: Sub-task
> Components: Query Processor
> Reporter: Eric Hanson
> Assignee: Jitendra Nath Pandey
> Attachments: Hive-4684.0.patch, Hive-4684.1.patch, HIVE-4684.1.patch,
> HIVE-4684.2.patch
>
>
> select dmachineid from factsqlengineam_vec_orc where 1073 = dmachineid + 1;
> Does not go down the vectorization path.
> Output:
> hive> select dmachineid from factsqlengineam_vec_orc where 1073 = dmachineid
> + 1;
> Total MapReduce jobs = 1
> Launching Job 1 out of 1
> Number of reduce tasks is set to 0 since there's no reduce operator
> Validating if vectorized execution is applicable
> Cannot vectorize the plan: org.apache.hadoop.hive.ql.metadata.HiveException:
> java.lang.ClassNotFoundException: org.apache.hadoop.hiv
> e.ql.exec.vector.expressions.gen.FilterLongScalarEqualLongColumn
> Starting Job = job_201306061504_0038, Tracking URL =
> http://localhost:50030/jobdetails.jsp?jobid=job_201306061504_0038
> Kill Command = c:\Hadoop\hadoop-1.1.0-SNAPSHOT\bin\hadoop.cmd job -kill
> job_201306061504_0038
> Hadoop job information for Stage-1: number of mappers: 8; number of reducers: > 0
> 2013-06-07 10:25:30,932 Stage-1 map = 0%, reduce = 0%
> 2013-06-07 10:25:39,953 Stage-1 map = 25%, reduce = 0%
> 2013-06-07 10:25:42,959 Stage-1 map = 49%, reduce = 0%, Cumulative CPU 8.172
> sec
> 2013-06-07 10:25:43,962 Stage-1 map = 49%, reduce = 0%, Cumulative CPU 8.172
> sec
> ...
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