Mustafa Iman created HIVE-22877:
-----------------------------------
Summary: Wrong decimal boundary for casting to Decimal64
Key: HIVE-22877
URL: https://issues.apache.org/jira/browse/HIVE-22877
Project: Hive
Issue Type: Bug
Components: Vectorization
Affects Versions: 4.0.0
Reporter: Mustafa Iman
Assignee: Mustafa Iman
During vectorization, decimal fields that are obtained via generic udfs are
cast to Decimal64 in some circumstances. For decimal to decimal64 cast, hive
compares the source column's `scale + precision` to 18(maximum number of digits
that can be represented by a long). A decimal can fit in a long as long as its
`scale` is smaller than or equal to 18. Precision is irrelevant.
Since vectorized generic udf expression takes precision into account, it
computes wrong output column vector: Decimal instead of Decimal64. This in turn
causes ClassCastException down the operator chain.
Below query fails with class cast exception:
{code:java}
create table mini_store
(
s_store_sk int,
s_store_id string
)
row format delimited fields terminated by '\t'
STORED AS ORC;
create table mini_sales
(
ss_store_sk int,
ss_quantity int,
ss_sales_price decimal(7,2)
)
row format delimited fields terminated by '\t'
STORED AS ORC;
insert into mini_store values (1, 'store');
insert into mini_sales values (1, 2, 1.2);
select s_store_id, coalesce(ss_sales_price*ss_quantity,0) sumsales
from mini_sales, mini_store where ss_store_sk = s_store_sk
{code}
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
