r1b commented on code in PR #18450:
URL: https://github.com/apache/datafusion/pull/18450#discussion_r2484980004
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datafusion/sql/src/expr/value.rs:
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@@ -123,8 +123,19 @@ impl<S: ContextProvider> SqlToRel<'_, S> {
return if param_data_types.is_empty() {
Ok(Expr::Placeholder(Placeholder::new_with_field(param,
None)))
} else {
- // when PREPARE Statement, param_data_types length is
always 0
- plan_err!("Invalid placeholder, not a number: {param}")
+ // FIXME: This branch is shared by params from PREPARE and
CREATE FUNCTION, but
+ // only CREATE FUNCTION currently supports named params.
For now, we rewrite
+ // these to positional params.
Review Comment:
**note** I explored doing this without rewriting to positional params, but I
couldn't see a path forward without either:
- Adding a way to distinguish between prepared statement vs SQL UDF context
- Supporting named params in prepared statements (not currently supported in
sqlparser AFAICT)
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