alamb commented on code in PR #16456:
URL: https://github.com/apache/datafusion/pull/16456#discussion_r2283002596
##########
datafusion/sql/src/expr/mod.rs:
##########
@@ -823,13 +826,12 @@ impl<S: ContextProvider> SqlToRel<'_, S> {
return not_impl_err!("ANY in LIKE expression");
}
let pattern = self.sql_expr_to_logical_expr(pattern, schema,
planner_context)?;
- let escape_char = if let Some(char) = escape_char {
- if char.len() != 1 {
- return plan_err!("Invalid escape character in LIKE
expression");
+ let escape_char = match escape_char {
+ Some(Value::SingleQuotedString(char)) if char.len() == 1 => {
+ Some(char.chars().next().unwrap())
}
- Some(char.chars().next().unwrap())
- } else {
- None
+ Some(_) => return plan_err!("Invalid escape character in LIKE
expression"),
Review Comment:
It is nothing this PR did, but these messages would be nicer if they told
the user what was supported
Maybe something like
```suggestion
Some(_) => return plan_err!("Invalid escape character
'{escape_char}' in LIKE expression. Expected a single character"),
```
The same comment applies to the SIMILAR TO syntax below
##########
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:
This basically hard codes the use of a function named "substr" into the
planner
I think the preferred way is to use the `ExprPlanner` API, similarly to how
plan field access is done here:
https://github.com/apache/datafusion/blob/d987d2dc80c702c86d7ac853fb9c251a291d7b91/datafusion/expr/src/planner.rs#L134
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