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From "Yin Huai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-13753) Column nullable is derived incorrectly
Date Mon, 02 May 2016 23:33:12 GMT

    [ https://issues.apache.org/jira/browse/SPARK-13753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15267730#comment-15267730
] 

Yin Huai commented on SPARK-13753:
----------------------------------

[~davies] Thank you for looking at it. Yea, we do have the requirement that keys of a map
should not contain null. For now, I think that option 1 is reasonable. 

> 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
>
> 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. 



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