diff --git a/datafusion/physical-expr/src/type_coercion.rs b/datafusion/physical-expr/src/type_coercion.rs
index d83491bd79ee1..32f91d6948665 100644
--- a/datafusion/physical-expr/src/type_coercion.rs
+++ b/datafusion/physical-expr/src/type_coercion.rs
@@ -131,11 +131,11 @@ mod tests {
                 Signature::variadic(vec![DataType::Float32], Volatility::Immutable),
                 vec![DataType::Float32, DataType::Float32],
             )?,
-            // for variadic equal, no casting is performed
+            // u32 -> u64
             case(
-                vec![DataType::Float32, DataType::UInt32],
-                Signature::variadic_equal(vec![DataType::Float32], Volatility::Immutable),
-                vec![DataType::Float32, DataType::Float32],
+                vec![DataType::UInt64, DataType::UInt32],
+                Signature::variadic_equal(vec![DataType::UInt64, DataType::UInt32], Volatility::Immutable),
+                vec![DataType::UInt64, DataType::UInt64],
             )?,
             // common type is u64
             case(