dolphin: Add STRCMP function signature

Author: kyleconroy

internal/engine/dolphin/stdlib.go

@@ -1473,9 +1473,16 @@ func defaultSchema(name string) *catalog.Schema {
 			ReturnType: &ast.TypeName{Name: "any"},
 		},
 		{
-			Name:       "STRCMP",
-			Args:       []*catalog.Argument{},
-			ReturnType: &ast.TypeName{Name: "any"},
+			Name: "STRCMP",
+			Args: []*catalog.Argument{
+				{
+					Type: &ast.TypeName{Name: "text"},
+				},
+				{
+					Type: &ast.TypeName{Name: "text"},
+				},
+			},
+			ReturnType: &ast.TypeName{Name: "tinyint"},
 		},
 		{
 			Name:       "STR_TO_DATE",