[jira] [Commented] (SPARK-37392) Catalyst optimizer very time-consuming and memory-intensive with some "explode(array)"

["Shivam Verma (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-37392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17484072#comment-17484072 ] 

Shivam Verma commented on SPARK-37392:
--------------------------------------

Is there a plan to backport the changes to 3.1.2 and 3.2.0?

> Catalyst optimizer very time-consuming and memory-intensive with some "explode(array)" 
> ---------------------------------------------------------------------------------------
>
>                 Key: SPARK-37392
>                 URL: https://issues.apache.org/jira/browse/SPARK-37392
>             Project: Spark
>          Issue Type: Bug
>          Components: Optimizer
>    Affects Versions: 3.1.2, 3.2.0
>            Reporter: Francois MARTIN
>            Assignee: Wenchen Fan
>            Priority: Major
>             Fix For: 3.1.3, 3.2.1, 3.3.0
>
>
> The problem occurs with the simple code below:
> {code:java}
> import session.implicits._
> Seq(
>   (1, "x", "x", "x", "x", "x", "x", "x", "x", "x", "x", "x", "x", "x", "x", "x", "x", "x", "x", "x", "x")
> ).toDF()
>   .checkpoint() // or save and reload to truncate lineage
>   .createOrReplaceTempView("sub")
> session.sql("""
>   SELECT
>     *
>   FROM
>   (
>     SELECT
>       EXPLODE( ARRAY( * ) ) result
>     FROM
>     (
>       SELECT
>         _1 a, _2 b, _3 c, _4 d, _5 e, _6 f, _7 g, _8 h, _9 i, _10 j, _11 k, _12 l, _13 m, _14 n, _15 o, _16 p, _17 q, _18 r, _19 s, _20 t, _21 u
>       FROM
>         sub
>     )
>   )
>   WHERE
>     result != ''
>   """).show() {code}
> It takes several minutes and a very high Java heap usage, when it should be immediate.
> It does not occur when replacing the unique integer value (1) with a string value ({_}"x"{_}).
> All the time is spent in the _PruneFilters_ optimization rule.
> Not reproduced in Spark 2.4.1.



--
This message was sent by Atlassian Jira
(v8.20.1#820001)

---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org