Dimchikkk commented on code in PR #16456:
URL: https://github.com/apache/datafusion/pull/16456#discussion_r2156911331
##########
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
+ .context_provider
+ .get_function_meta("substr")
+ .ok_or_else(|| {
+ internal_datafusion_err!("Unable to find expected 'substr'
function")
+ })?;
+
+ Ok(Expr::ScalarFunction(ScalarFunction::new_udf(
+ fun,
+ substring_args,
+ )))
Review Comment:
Without this change the test fails:
```rs
#[test]
fn test_order_by_to_sql_3() {
let statement = generate_round_trip_statement(
GenericDialect {},
r#"SELECT id, first_name, substr(first_name,0,5) FROM person ORDER
BY id, substr(first_name,0,5)"#,
);
assert_snapshot!(
statement,
@r#"SELECT person.id, person.first_name, substr(person.first_name,
0, 5) FROM person ORDER BY person.id ASC NULLS LAST, substr(person.first_name,
0, 5) ASC NULLS LAST"#
);
}
```
In the previous version substr were hitting:
```rs
SQLExpr::Function(function) => {
self.sql_function_to_expr(function, schema, planner_context)
}
```
now it's hitting:
```rs
SQLExpr::Substring {
expr,
substring_from,
substring_for,
special: _,
shorthand: _,
} => self.sql_substring_to_expr(
expr,
substring_from,
substring_for,
schema,
planner_context,
),
```
Open for suggestions if there is a better way to handle it.
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