feat: float signature class

Author: alan910127

datafusion/common/src/types/native.rs

@@ -436,6 +436,12 @@ impl NativeType {
         )
     }
 
+    #[inline]
+    pub fn is_float(&self) -> bool {
+        use NativeType::*;
+        matches!(self, Float16 | Float32 | Float64)
+    }
+
     #[inline]
     pub fn is_integer(&self) -> bool {
         use NativeType::*;

datafusion/expr-common/src/signature.rs

@@ -216,6 +216,7 @@ pub enum TypeSignatureClass {
     Duration,
     Native(LogicalTypeRef),
     Numeric,
+    Float,
     Integer,
 }
 
@@ -258,6 +259,9 @@ impl TypeSignatureClass {
                     DataType::Decimal256(3, -2),
                 ]
             }
+            TypeSignatureClass::Float => {
+                vec![DataType::Float64]
+            }
             TypeSignatureClass::Integer => {
                 vec![DataType::Int64]
             }
@@ -280,6 +284,7 @@ impl TypeSignatureClass {
             TypeSignatureClass::Interval if logical_type.is_interval() => true,
             TypeSignatureClass::Duration if logical_type.is_duration() => true,
             TypeSignatureClass::Numeric if logical_type.is_numeric() => true,
+            TypeSignatureClass::Float if logical_type.is_float() => true,
             TypeSignatureClass::Integer if logical_type.is_integer() => true,
             _ => false,
         }
@@ -311,6 +316,9 @@ impl TypeSignatureClass {
             TypeSignatureClass::Numeric if native_type.is_numeric() => {
                 Ok(origin_type.to_owned())
             }
+            TypeSignatureClass::Float if native_type.is_float() => {
+                Ok(origin_type.to_owned())
+            }
             TypeSignatureClass::Integer if native_type.is_integer() => {
                 Ok(origin_type.to_owned())
             }