Zoltan Haindrich created HIVE-23082:
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Summary: 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
Reporter: Zoltan Haindrich
Assignee: Zoltan Haindrich
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}
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