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https://issues.apache.org/jira/browse/CALCITE-7267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18036011#comment-18036011
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Julian Hyde commented on CALCITE-7267:
--------------------------------------
Yes, that's a great summary.
In the description I would add "When generating SQL targeted at Oracle, the
JDBC adapter should translate calls to the CHAR_LENGTH function as if they were
calls to LENGTH. This is because Oracle has no CHAR_LENGTH function."
I see that this case is a clone of cases for SQLite (CALCITE-6997), DuckDB
(CALCITE-6988), Presto (CALCITE-6643), Derby (CALCITE-6892) and others. The
original case had a shitty summary, which was duly cloned by each successor
case. Each case added a new test method, instead of just adding a line to
{{testSnowflakeLength}}.
> CHAR_LENGTH function is not recognized in Oracle dialect
> --------------------------------------------------------
>
> Key: CALCITE-7267
> URL: https://issues.apache.org/jira/browse/CALCITE-7267
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.41.0
> Reporter: Yu Xu
> Assignee: Yu Xu
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.42.0
>
>
> *CHAR_LENGTH* function is not support for Oracle, but LENGTH is supported.
> refer:
> [https://docs.oracle.com/en/database/oracle/oracle-database/18/sqlrf/LENGTH.html]
>
> currently Oracle dialect in Calcite not convert CHAR_LENGTH to LENGTH
> function, which would error as follow:
> execute sql1
> {code:java}
> select CHAR_LENGTH('aaa') {code}
> error message report:
> {code:java}
> ORA-00904: "CHAR_LENGTH": invalid identifier
> https://docs.oracle.com/error-help/db/ora-00904/
> 00904. 00000 - "%s: invalid identifier"
> *Cause: The identifier or column name entered was invalid.
> *Action: Ensure the following
> Error at Line: 1 Column: 6 {code}
>
> execute sql2
> {code:java}
> select LENGTH('aaa') {code}
> then result is ok:
> {code:java}
> 3
> {code}
>
> so in Oracle dialect, CHAR_LENGTH should convert to LENGTH function. such as
> other dialect presto https://issues.apache.org/jira/browse/CALCITE-6643
>
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