[jira] [Resolved] (SPARK-23774) `Cast` to CHAR/VARCHAR should truncate the values

["Dongjoon Hyun (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-23774?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dongjoon Hyun resolved SPARK-23774.
-----------------------------------
    Resolution: Won't Do

Per review comments, we will revisit this when we can support CHAR/VARCHAR natively.

> `Cast` to CHAR/VARCHAR should truncate the values
> -------------------------------------------------
>
>                 Key: SPARK-23774
>                 URL: https://issues.apache.org/jira/browse/SPARK-23774
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.1.2, 2.2.1, 2.3.0
>            Reporter: Dongjoon Hyun
>            Priority: Major
>
> This issue aims to fix the following `CAST` behavior on `CHAR/VARCHAR` types.
> Since HiveStringType is used only in parsing, this PR is also about parsing.
> *Spark*
> {code}
> scala> sql("SELECT CAST('123' AS CHAR(1)), CAST('123' AS VARCHAR(1))").show
> +-------------------+-------------------+
> |CAST(123 AS STRING)|CAST(123 AS STRING)|
> +-------------------+-------------------+
> |                123|                123|
> +-------------------+-------------------+
> scala> sql("SELECT CAST('123' AS CHAR(0)), CAST('123' AS VARCHAR(0))").show
> +-------------------+-------------------+
> |CAST(123 AS STRING)|CAST(123 AS STRING)|
> +-------------------+-------------------+
> |                123|                123|
> +-------------------+-------------------+
> {code}
> *Hive*
> {code}
> hive> SELECT CAST('123' AS CHAR(1)), CAST('123' AS VARCHAR(1));
> OK
> 1	1
> hive> SELECT CAST('123' AS CHAR(0)), CAST('123' AS VARCHAR(0));
> FAILED: RuntimeException Char length 0 out of allowed range [1, 255]
> {code}



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