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Posted to dev@hive.apache.org by "Matt McCline (JIRA)" <ji...@apache.org> on 2014/12/19 00:58:14 UTC
[jira] [Created] (HIVE-9168) Vectorized Coalesce for strings is
broken
Matt McCline created HIVE-9168:
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Summary: Vectorized Coalesce for strings is broken
Key: HIVE-9168
URL: https://issues.apache.org/jira/browse/HIVE-9168
Project: Hive
Issue Type: Bug
Components: Vectorization
Affects Versions: 0.14.0, 0.13.0
Reporter: Matt McCline
Assignee: Matt McCline
Priority: Critical
Fix For: 0.15.0, 0.14.1
Vectorized Coalesce uses BytesColumnVector.setElement which does not set the output string length correctly.
{noformat}
create table str_str_orc (str1 string, str2 string) stored as orc;
insert into table str_str_orc values (null, "X"), ("0", "X"), ("1", "X"), (null, "y");
EXPLAIN
SELECT
str2, ROUND(sum(cast(COALESCE(str1, 0) as int))/60, 2) as result
from str_str_orc
GROUP BY str2;
SELECT
str2, ROUND(sum(cast(COALESCE(str1, 0) as int))/60, 2) as result
from str_str_orc
GROUP BY str2;
EXPLAIN
SELECT COALESCE(str1, 0) as result
from str_str_orc;
SELECT COALESCE(str1, 0) as result
from str_str_orc;
{noformat}
Produces different results when vectorized and not vectorized.
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