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Posted to issues@hive.apache.org by "Ashutosh Chauhan (JIRA)" <ji...@apache.org> on 2016/06/02 04:01:02 UTC
[jira] [Commented] (HIVE-13806) Extension to folding NOT
expressions in CBO
[ https://issues.apache.org/jira/browse/HIVE-13806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15311696#comment-15311696 ]
Ashutosh Chauhan commented on HIVE-13806:
-----------------------------------------
+1 will likely require updates to other golden files as well.
> Extension to folding NOT expressions in CBO
> -------------------------------------------
>
> Key: HIVE-13806
> URL: https://issues.apache.org/jira/browse/HIVE-13806
> Project: Hive
> Issue Type: Sub-task
> Components: CBO
> Affects Versions: 2.1.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Attachments: HIVE-13806.patch
>
>
> Follow-up of HIVE-13068.
> Extension to folding expressions for NOT.
> Currently, simplification is performed only if NOT is applied on a simple operation (e.g. IS NOT NULL, =, <>, etc.). We should take advantage of NOT distributivity when it is applied on OR/AND operations to try to simplify predicates further.
> Ex. ql/src/test/results/clientpositive/folder_predicate.q.out
> {noformat}
> explain
> SELECT * FROM predicate_fold_tb WHERE not(value IS NOT NULL AND value = 3)
> {noformat}
> Plan:
> {noformat}
> STAGE DEPENDENCIES:
> Stage-1 is a root stage
> Stage-0 depends on stages: Stage-1
> STAGE PLANS:
> Stage: Stage-1
> Map Reduce
> Map Operator Tree:
> TableScan
> alias: predicate_fold_tb
> Statistics: Num rows: 6 Data size: 7 Basic stats: COMPLETE Column stats: NONE
> Filter Operator
> predicate: (not (value is not null and (value = 3))) (type: boolean)
> Statistics: Num rows: 3 Data size: 3 Basic stats: COMPLETE Column stats: NONE
> Select Operator
> expressions: value (type: int)
> outputColumnNames: _col0
> Statistics: Num rows: 3 Data size: 3 Basic stats: COMPLETE Column stats: NONE
> File Output Operator
> compressed: false
> Statistics: Num rows: 3 Data size: 3 Basic stats: COMPLETE Column stats: NONE
> table:
> input format: org.apache.hadoop.mapred.SequenceFileInputFormat
> output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
> serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
> Stage: Stage-0
> Fetch Operator
> limit: -1
> Processor Tree:
> ListSink
> {noformat}
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