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https://issues.apache.org/jira/browse/SPARK-34669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17299290#comment-17299290
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Hyukjin Kwon commented on SPARK-34669:
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I am suggesting to check the behaviours of length function in other DBMSes to
see if Spark's behaviour makes sense or not, instead of arguing with one
specific DBMS.
> Spark SQL uses the function[ length()] to return the length of the string
> rather than the length of the character
> -----------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-34669
> URL: https://issues.apache.org/jira/browse/SPARK-34669
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.1
> Environment: spark 3.1.1,scala 2.12
> Reporter: zhishun luan
> Priority: Major
>
> Such as the title.
> For the function length (). MySQL and other relational databases, we get the
> byte length, but spark SQL gets the string length. For these two cases,
> please provide a new function to get the byte length, otherwise it is easy to
> mislead users
> ----------------------------------------------------------------------------------------
> {code:java}
> // code placeholder
> SparkSession.builder()
> .config(new SparkConf().setMaster("local"))
> .getOrCreate()
> .sql("select length('测a')")
> .show()
> {code}
>
> [result]
> +-----------+
> |length(测a)|
> +-----------+
> |2|
> +-----------+
> in mysql
> +-----------+
> |length(测a)|
> +-----------+
> |4|
> +-----------+
>
>
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