alamb commented on code in PR #16456:
URL: https://github.com/apache/datafusion/pull/16456#discussion_r2286420285
##########
datafusion/sql/src/expr/substring.rs:
##########
@@ -77,8 +78,16 @@ impl<S: ContextProvider> SqlToRel<'_, S> {
}
}
- not_impl_err!(
- "Substring not supported by UserDefinedExtensionPlanners:
{substring_args:?}"
- )
+ let fun = self
Review Comment:
I spent some time debugging and I think the solution is that we needed to
register the appropriate planner with the tests. I pushed a commit here:
e46e5322b81c33883ed79dfeac89e0a5dd8382dc
Note I also found the name of the extension planner very confusing, and I
will make a separate PR to fix it
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