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https://issues.apache.org/jira/browse/CALCITE-4014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17112734#comment-17112734
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Danny Chen commented on CALCITE-4014:
-------------------------------------
Thanks, [~groobyming] for reporting this ~
I saw the syntax we support from the parser:
```sql
<CONVERT> { s = span(); }
<LPAREN>
e = Expression(ExprContext.ACCEPT_SUB_QUERY) {
args = startList(e);
}
<USING> name = SimpleIdentifier() {
args.add(name);
}
<RPAREN> {
return SqlStdOperatorTable.CONVERT.createCall(s.end(this), args);
}
```
That means we did support CONVERT( ... USING ...) clause. But you are right, we
do not translate the charSet correctly, there needs more effort in the convert
table [1], we need to translate the charSet as a constant instead of a column
name.
[1]
https://github.com/apache/calcite/blob/05376d6bff11ccef690addb4f9c40ab16dd20bec/core/src/main/java/org/apache/calcite/rex/RexSqlStandardConvertletTable.java#L103
> calcite convert(column using utf8mb4) throws exception
> ------------------------------------------------------
>
> Key: CALCITE-4014
> URL: https://issues.apache.org/jira/browse/CALCITE-4014
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.21.0
> Reporter: groobyming
> Priority: Major
> Attachments: image-2020-05-20-17-00-28-611.png
>
>
> Hello everyone, I found that when performing the following sql
> verification, I will be prompted that the UTF8MB4 field cannot be found in
> the table, but after reading the source code calcite is built-in to support
> this convert function, is it not fully implemented yet?
>
> SQL is as follows:
> select convert(name using utf8mb4) from test b where name = '4'
>
> Error Message:
> !image-2020-05-20-17-00-28-611.png!
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