You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2019/05/21 04:25:14 UTC
[jira] [Updated] (SPARK-13753) Column nullable is derived
incorrectly
[ https://issues.apache.org/jira/browse/SPARK-13753?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Hyukjin Kwon updated SPARK-13753:
---------------------------------
Labels: bulk-closed (was: )
> 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
> Priority: Critical
> Labels: bulk-closed
>
> There is a problem in spark sql to derive nullable column and used in optimization incorrectly. In following query:
> {code}
> 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
> {code}
> 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
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org