You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@spark.apache.org by "Jingwei Lu (JIRA)" <ji...@apache.org> on 2016/03/08 21:20:40 UTC
[jira] [Created] (SPARK-13753) Column nullable is derived
incorrectly
Jingwei Lu created SPARK-13753:
----------------------------------
Summary: Column nullable is derived incorrectly
Key: SPARK-13753
URL: https://issues.apache.org/jira/browse/SPARK-13753
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 1.5.2
Reporter: Jingwei Lu
There is a problem in spark sql to derive nullable column and used in optimization incorrectly. In following query:
select concat("perf.realtime.web", b.tags[1]) as metric, b.value, b.tags[0]
from (
select explode(map(a.frontend[0], ARRAY(concat("metric:frontend", ",controller:", COALESCE(controller, "null"), ",action:", COALESCE(action, "null")), ".p50"),
a.frontend[1], ARRAY(concat("metric:frontend", ",controller:", COALESCE(controller, "null"), ",action:", COALESCE(action, "null")), ".p90"),
a.backend[0], ARRAY(concat("metric:backend", ",controller:", COALESCE(controller, "null"), ",action:", COALESCE(action, "null")), ".p50"),
a.backend[1], ARRAY(concat("metric:backend", ",controller:", COALESCE(controller, "null"), ",action:", COALESCE(action, "null")), ".p90"),
a.render[0], ARRAY(concat("metric:render", ",controller:", COALESCE(controller, "null"), ",action:", COALESCE(action, "null")), ".p50"),
a.render[1], ARRAY(concat("metric:render", ",controller:", COALESCE(controller, "null"), ",action:", COALESCE(action, "null")), ".p90"),
a.page_load_time[0], ARRAY(concat("metric:page_load_time", ",controller:", COALESCE(controller, "null"), ",action:", COALESCE(action, "null")), ".p50"),
a.page_load_time[1], ARRAY(concat("metric:page_load_time", ",controller:", COALESCE(controller, "null"), ",action:", COALESCE(action, "null")), ".p90"),
a.total_load_time[0], ARRAY(concat("metric:total_load_time", ",controller:", COALESCE(controller, "null"), ",action:", COALESCE(action, "null")), ".p50"),
a.total_load_time[1], ARRAY(concat("metric:total_load_time", ",controller:", COALESCE(controller, "null"), ",action:", COALESCE(action, "null")), ".p90"))) as (value, tags)
from (
select data.controller as controller, data.action as action,
percentile(data.frontend, array(0.5, 0.9)) as frontend,
percentile(data.backend, array(0.5, 0.9)) as backend,
percentile(data.render, array(0.5, 0.9)) as render,
percentile(data.page_load_time, array(0.5, 0.9)) as page_load_time,
percentile(data.total_load_time, array(0.5, 0.9)) as total_load_time
from air_events_rt
where type='air_events' and data.event_name='pageload'
group by data.controller, data.action
) a
) b
where b.value is not null
b.value is incorrectly derived as not nullable. "b.value is not null" predicate will be ignored by optimizer which cause the query return incorrect result.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org