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https://issues.apache.org/jira/browse/HIVE-13803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15351376#comment-15351376
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Jesus Camacho Rodriguez commented on HIVE-13803:
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I just did. I pointed out the changes that I made in the code that I brought
from Calcite so it is easier for you to review it.
> More aggressive inference of transitive predicates for inner joins
> ------------------------------------------------------------------
>
> Key: HIVE-13803
> URL: https://issues.apache.org/jira/browse/HIVE-13803
> Project: Hive
> Issue Type: Sub-task
> Components: CBO
> Affects Versions: 2.1.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Attachments: HIVE-13803.01.patch, HIVE-13803.02.patch,
> HIVE-13803.patch
>
>
> Follow-up of HIVE-13068.
> Currently for inner joins, we do not infer transitive predicates that do not
> reference any of the columns of the input. These predicates can be evaluated
> statically and can be useful to quickly discard intermediary results.
> Ex. ql/src/test/results/clientpositive/constprog3.q.out
> {noformat}
> explain
> select table1.id, table1.val, table1.val1
> from table1 inner join table3
> on table1.dimid = table3.id and table3.id = 1 where table1.dimid <> 1
> {noformat}
> Current 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: table1
> Statistics: Num rows: 1 Data size: 0 Basic stats: PARTIAL Column
> stats: NONE
> Filter Operator
> predicate: false (type: boolean)
> Statistics: Num rows: 1 Data size: 0 Basic stats: PARTIAL
> Column stats: NONE
> Select Operator
> expressions: id (type: int), val (type: int), val1 (type: int)
> outputColumnNames: _col0, _col1, _col2
> Statistics: Num rows: 1 Data size: 0 Basic stats: PARTIAL
> Column stats: NONE
> Reduce Output Operator
> sort order:
> Statistics: Num rows: 1 Data size: 0 Basic stats: PARTIAL
> Column stats: NONE
> value expressions: _col0 (type: int), _col1 (type: int),
> _col2 (type: int)
> TableScan
> alias: table3
> Statistics: Num rows: 1 Data size: 0 Basic stats: PARTIAL Column
> stats: NONE
> Filter Operator
> predicate: (id = 1) (type: boolean)
> Statistics: Num rows: 1 Data size: 0 Basic stats: PARTIAL
> Column stats: NONE
> Select Operator
> Statistics: Num rows: 1 Data size: 0 Basic stats: PARTIAL
> Column stats: NONE
> Reduce Output Operator
> sort order:
> Statistics: Num rows: 1 Data size: 0 Basic stats: PARTIAL
> Column stats: NONE
> Reduce Operator Tree:
> Join Operator
> condition map:
> Inner Join 0 to 1
> keys:
> 0
> 1
> outputColumnNames: _col0, _col1, _col2
> Statistics: Num rows: 1 Data size: 0 Basic stats: PARTIAL Column
> stats: NONE
> File Output Operator
> compressed: false
> Statistics: Num rows: 1 Data size: 0 Basic stats: PARTIAL 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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