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https://issues.apache.org/jira/browse/FLINK-24413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17425563#comment-17425563
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Jark Wu commented on FLINK-24413:
---------------------------------
I slightly favor triming to specific precision. I think this follows the
precision definition in SQL standard?
I have some concern about current behavior, if we are inserting the result of
{{CAST('abcdfe' AS CHAR(3))}} into a {{CHAR(3)}} column of a MySQL table,
everything should work however it fails during writing to MySQL, because the
character length is too long.
> Casting to a CHAR() and VARCHAR() doesn't trim the string to the specified
> precision
> ------------------------------------------------------------------------------------
>
> Key: FLINK-24413
> URL: https://issues.apache.org/jira/browse/FLINK-24413
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / API
> Reporter: Marios Trivyzas
> Priority: Major
>
> *CAST**('abcdfe' AS CHAR(3))* should trim the string to 3 chars but currently
> returns the whole string *'abcdfe'*.
>
> PostgreSQL and Oracle for example behave as such:
> postgres=# select '123456afas'::char(4);
> bpchar
> --------
> 1234
> (1 row)
> postgres=# select '123456afas'::varchar(5);
> varchar
> ---------
> 12345
> (1 row)
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