[
https://issues.apache.org/jira/browse/HIVE-23082?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Zoltan Haindrich updated HIVE-23082:
------------------------------------
Attachment: HIVE-23082.03.patch
> PK/FK stat rescale doesn't work in some cases
> ---------------------------------------------
>
> Key: HIVE-23082
> URL: https://issues.apache.org/jira/browse/HIVE-23082
> Project: Hive
> Issue Type: Bug
> Components: Statistics
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
> Attachments: HIVE-23082.01.patch, HIVE-23082.02.patch,
> HIVE-23082.03.patch, HIVE-23082.03.patch, HIVE-23082.03.patch,
> HIVE-23082.03.patch, HIVE-23082.03.patch
>
>
> As a result in Joins may retain the original estimate; see MAPJOIN_33 in this
> plan ; which retained the estimate of SEL_32
> {code}
> +----------------------------------------------------+
> | Explain |
> +----------------------------------------------------+
> | Plan optimized by CBO. |
> | |
> | Vertex dependency in root stage |
> | Map 1 <- Map 2 (BROADCAST_EDGE) |
> | |
> | Stage-0 |
> | Fetch Operator |
> | limit:12 |
> | Stage-1 |
> | Map 1 vectorized |
> | File Output Operator [FS_36] |
> | Limit [LIM_35] (rows=12 width=4) |
> | Number of rows:12 |
> | Select Operator [SEL_34] (rows=5040 width=4) |
> | Output:["_col0"] |
> | Map Join Operator [MAPJOIN_33] (rows=5040 width=8) |
> | Conds:SEL_32._col0=RS_30._col0(Inner) |
> | <-Map 2 [BROADCAST_EDGE] vectorized |
> | BROADCAST [RS_30] |
> | PartitionCols:_col0 |
> | Select Operator [SEL_29] (rows=1 width=8) |
> | Output:["_col0"] |
> | Filter Operator [FIL_28] (rows=1 width=108) |
> | predicate:((r_reason_id = 'reason 66') and r_reason_sk
> is not null) |
> | TableScan [TS_3] (rows=2 width=108) |
> |
> default@rx0,reason,Tbl:COMPLETE,Col:COMPLETE,Output:["r_reason_id","r_reason_sk"]
> |
> | <-Select Operator [SEL_32] (rows=5040 width=7) |
> | Output:["_col0"] |
> | Filter Operator [FIL_31] (rows=5040 width=7) |
> | predicate:sr_reason_sk is not null |
> | TableScan [TS_0] (rows=5112 width=7) |
> |
> default@sr0,store_returns,Tbl:COMPLETE,Col:COMPLETE,Output:["sr_reason_sk"] |
> | |
> +----------------------------------------------------+
> {code}
> repro:
> {code}
> set hive.query.results.cache.enabled=false;
> set hive.explain.user=true;
> drop table if exists default.rx0;
> drop table if exists default.sr0;
> create table rx0 (r_reason_id string, r_reason_sk bigint);
> create table sr0 (sr_reason_sk bigint);
> insert into rx0 values ('AAAAAAAAAAAAAAAA',1),('AAAAAAAAGEAAAAAA',70);
> insert into sr0 values (NULL),(1),(2),(3),(4),(5),(6),(7),(8),(9),(10),
> (11),(12),(13),(14),(15),(16),(17),(18),(19),(20),(21),(22),(23),(24),(25),
> (26),(27),(28),(29),(30),(31),(32),(33),(34),(35),(36),(37),(38),(39),(40),
> (41),(42),(43),(44),(45),(46),(47),(48),(49),(50),(51),(52),(53),(54),(55),
> (56),(57),(58),(59),(60),(61),(62),(63),(64),(65),(66),(67),(68),(69),(70);
> insert into sr0 select a.* from sr0 a,sr0 b;
> -- |sr0| ~ 5112
> explain select 1
> from default.sr0 store_returns , default.rx0 reason
> where sr_reason_sk = r_reason_sk
> and r_reason_id = 'reason 66'
> limit 12;
> {code}
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
