Jefffrey commented on code in PR #16456:
URL: https://github.com/apache/datafusion/pull/16456#discussion_r2285140974
##########
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'm not familiar with that API, though it seems to be used above already?
https://github.com/apache/datafusion/blob/c22d64b3f0596a9829eea60d7790729ddeec3819/datafusion/sql/src/expr/substring.rs#L72-L79
So this code here is more of a fallback I guess? Might need some help
understanding this part
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