use normalized equality or strict equality check in rows.go fieldPosB…

…yName

rows.go

@@ -816,21 +816,21 @@ func computeNamedStructFields(
 
 const structTagKey = "db"
 
-func fieldPosByName(fldDescs []pgconn.FieldDescription, field string, replace bool) (i int) {
+func fieldPosByName(fldDescs []pgconn.FieldDescription, field string, normalize bool) (i int) {
 	i = -1
-	if replace {
+
+	if normalize {
 		field = strings.ReplaceAll(field, "_", "")
 	}
 	for i, desc := range fldDescs {
-
-		// Snake case support.
-		descName := desc.Name
-		if replace {
-			descName = strings.ReplaceAll(desc.Name, "_", "")
-		}
-
-		if strings.EqualFold(descName, field) {
-			return i
+		if normalize {
+			if strings.EqualFold(strings.ReplaceAll(desc.Name, "_", ""), field) {
+				return i
+			}
+		} else {
+			if desc.Name == field {
+				return i
+			}
 		}
 	}
 	return