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Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2018/10/16 12:32:00 UTC
[jira] [Resolved] (SPARK-25579) Use quoted attribute names if
needed in pushed ORC predicates
[ https://issues.apache.org/jira/browse/SPARK-25579?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Hyukjin Kwon resolved SPARK-25579.
----------------------------------
Resolution: Fixed
Fix Version/s: 2.4.0
3.0.0
Issue resolved by pull request 22597
[https://github.com/apache/spark/pull/22597]
> Use quoted attribute names if needed in pushed ORC predicates
> -------------------------------------------------------------
>
> Key: SPARK-25579
> URL: https://issues.apache.org/jira/browse/SPARK-25579
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Dongjoon Hyun
> Assignee: Dongjoon Hyun
> Priority: Blocker
> Fix For: 3.0.0, 2.4.0
>
>
> This issue aims to fix an ORC performance regression at Spark 2.4.0 RCs from Spark 2.3.2. For column names with `.`, the pushed predicates are ignored.
> *Test Data*
> {code:java}
> scala> val df = spark.range(Int.MaxValue).sample(0.2).toDF("col.with.dot")
> scala> df.write.mode("overwrite").orc("/tmp/orc")
> {code}
> *Spark 2.3.2*
> {code:java}
> scala> spark.sql("set spark.sql.orc.impl=native")
> scala> spark.sql("set spark.sql.orc.filterPushdown=true")
> scala> spark.time(spark.read.orc("/tmp/orc").where("`col.with.dot` < 10").show)
> +------------+
> |col.with.dot|
> +------------+
> | 1|
> | 8|
> +------------+
> Time taken: 1486 ms
> scala> spark.time(spark.read.orc("/tmp/orc").where("`col.with.dot` < 10").show)
> +------------+
> |col.with.dot|
> +------------+
> | 1|
> | 8|
> +------------+
> Time taken: 163 ms
> {code}
> *Spark 2.4.0 RC2*
> {code:java}
> scala> spark.time(spark.read.orc("/tmp/orc").where("`col.with.dot` < 10").show)
> +------------+
> |col.with.dot|
> +------------+
> | 1|
> | 8|
> +------------+
> Time taken: 4087 ms
> scala> spark.time(spark.read.orc("/tmp/orc").where("`col.with.dot` < 10").show)
> +------------+
> |col.with.dot|
> +------------+
> | 1|
> | 8|
> +------------+
> Time taken: 1998 ms
> {code}
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