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Coerce Dictionary types for scalar functions #10077

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merged 4 commits into from
Apr 15, 2024
Merged

Coerce Dictionary types for scalar functions #10077

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da9dc8a
Coerce Dictionary types for scalar functions
viirya Apr 14, 2024
4a3a6fd
Fix
viirya Apr 15, 2024
819b88c
Fix format
viirya Apr 15, 2024
e5dcde3
Add test
viirya Apr 15, 2024
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15 changes: 15 additions & 0 deletions datafusion/expr/src/built_in_function.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -319,4 +319,19 @@ mod tests {
.unwrap();
assert_eq!(return_type, DataType::Date32);
}

#[test]
fn test_coalesce_return_types_dictionary() {
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👍 we saw something similar in #9925

let coalesce = BuiltinScalarFunction::Coalesce;
let return_type = coalesce
.return_type(&[
DataType::Dictionary(Box::new(DataType::Int32), Box::new(DataType::Utf8)),
DataType::Utf8,
])
.unwrap();
assert_eq!(
return_type,
DataType::Dictionary(Box::new(DataType::Int32), Box::new(DataType::Utf8))
);
}
}
25 changes: 23 additions & 2 deletions datafusion/expr/src/type_coercion/functions.rs
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Expand Up @@ -314,8 +314,13 @@ fn coerced_from<'a>(
// match Dictionary first
match (type_into, type_from) {
// coerced dictionary first
(cur_type, Dictionary(_, value_type)) | (Dictionary(_, value_type), cur_type)
if coerced_from(cur_type, value_type).is_some() =>
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When coercing into dictionary type, the type_into and type_from parameters are in incorrect order.

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That is an excellent find. Thanks @jayzhan211 for pointing that out

(_, Dictionary(_, value_type))
if coerced_from(type_into, value_type).is_some() =>
{
Some(type_into.clone())
}
(Dictionary(_, value_type), _)
if coerced_from(value_type, type_from).is_some() =>
{
Some(type_into.clone())
}
Expand Down Expand Up @@ -624,4 +629,20 @@ mod tests {

Ok(())
}

#[test]
fn test_coerced_from_dictionary() {
let type_into =
DataType::Dictionary(Box::new(DataType::Int32), Box::new(DataType::UInt32));
let type_from = DataType::Int64;
assert_eq!(coerced_from(&type_into, &type_from), None);

let type_from =
DataType::Dictionary(Box::new(DataType::Int32), Box::new(DataType::UInt32));
let type_into = DataType::Int64;
assert_eq!(
coerced_from(&type_into, &type_from),
Some(type_into.clone())
);
}
}