kasakrisz commented on a change in pull request #1676:
URL: https://github.com/apache/hive/pull/1676#discussion_r530266544
##########
File path:
ql/src/test/results/clientpositive/llap/materialized_view_rewrite_window.q.out
##########
@@ -166,7 +166,7 @@ POSTHOOK: Input: arc_view@wealth
#### A masked pattern was here ####
CBO PLAN:
HiveSortLimit(sort0=[$0], dir0=[ASC])
- HiveProject(quartile=[$0], total=[$1])
+ HiveProject(quartile=[CAST($0):DECIMAL(12, 1)], total=[$1])
Review comment:
The optimiziter rewrites this query to use materialized view
`mv_tv_view_data_av1`.
The plan of the mv with this patch is changed
from
```
HiveTableScan(table=[[arc_view, mv_tv_view_data_av1]],
table:alias=[mv_tv_view_data_av1])
```
to
```
LogicalProject(quartile=[CAST($0):DECIMAL(12, 1)], total=[$1])
HiveTableScan(table=[[arc_view, mv_tv_view_data_av1]],
table:alias=[mv_tv_view_data_av1])
```
The mv definition contains a constant value cast to Decimal `cast(1.5 as
decimal(9,4))`
```
create materialized view mv_tv_view_data_av1 stored as orc TBLPROPERTIES
('transactional'='true') as
select
t.quartile,
max(t.total_views) total
from wealth t2,
(select
total_views `total_views`,
sum(cast(1.5 as decimal(9,4))) over (order by total_views) as quartile,
program
from tv_view_data) t
where t.program=t2.watches
group by quartile;
```
We need the project with the cast on top of the mv scan because the mv table
schema is different than the query schema.
RowTypes after the patch
```
viewscan rowType: RecordType(DECIMAL(12, 4) quartile, BIGINT total)
queryRel rowType: RecordType(DECIMAL(12, 1) quartile, BIGINT $f1)
```
before the patch
```
viewscan rowType: RecordType(DECIMAL(12, 1) quartile, BIGINT total)
queryRel rowType: RecordType(DECIMAL(12, 1) quartile, BIGINT $f1)
```
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