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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2020/09/16 19:09:00 UTC
[jira] [Commented] (SPARK-24994) Add UnwrapCastInBinaryComparison
optimizer to simplify literal types
[ https://issues.apache.org/jira/browse/SPARK-24994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17197198#comment-17197198 ]
Apache Spark commented on SPARK-24994:
--------------------------------------
User 'sunchao' has created a pull request for this issue:
https://github.com/apache/spark/pull/29775
> Add UnwrapCastInBinaryComparison optimizer to simplify literal types
> --------------------------------------------------------------------
>
> Key: SPARK-24994
> URL: https://issues.apache.org/jira/browse/SPARK-24994
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: liuxian
> Assignee: Chao Sun
> Priority: Major
> Fix For: 3.1.0
>
>
> For this statement: select * from table1 where a = 100;
> the data type of `a` is `smallint` , because the defaut data type of 100 is `int` ,so the data type of 'a' is converted to `int`.
> In this case, it does not support push down to parquet.
> In our business, for our SQL statements, and we generally do not convert 100 to `smallint`, We hope that it can support push down to parquet for this situation.
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