houqp commented on a change in pull request #7253:
URL: https://github.com/apache/arrow/pull/7253#discussion_r429568842
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File path: rust/datafusion/src/logicalplan.rs
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@@ -725,36 +725,47 @@ impl fmt::Debug for LogicalPlan {
/// Verify a given type cast can be performed
pub fn can_coerce_from(type_into: &DataType, type_from: &DataType) -> bool {
use self::DataType::*;
+
+ if type_from == type_into {
+ return true;
+ }
+
match type_into {
Int8 => match type_from {
Int8 => true,
_ => false,
},
Int16 => match type_from {
- Int8 | Int16 | UInt8 => true,
+ Int8 | Int16 => true,
+ UInt8 => true,
_ => false,
},
Int32 => match type_from {
- Int8 | Int16 | Int32 | UInt8 | UInt16 => true,
+ Int8 | Int16 | Int32 => true,
+ UInt8 | UInt16 => true,
_ => false,
},
Int64 => match type_from {
- Int8 | Int16 | Int32 | Int64 | UInt8 | UInt16 | UInt32 => true,
+ Int8 | Int16 | Int32 | Int64 => true,
+ UInt8 | UInt16 | UInt32 => true,
_ => false,
},
UInt8 => match type_from {
UInt8 => true,
_ => false,
},
UInt16 => match type_from {
+ Int8 => true,
Review comment:
for my own curiosity, what's the expected behavior when a negative int8
is coerced into uint16?
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