feat: add support for enum in UnknownScalar (#61)

Author: GurtejSohi

hypertrace-core-graphql-common-schema/src/main/java/org/hypertrace/core/graphql/common/schema/typefunctions/UnknownScalar.java

@@ -4,6 +4,7 @@
 import graphql.annotations.processor.typeFunctions.TypeFunction;
 import graphql.language.ArrayValue;
 import graphql.language.BooleanValue;
+import graphql.language.EnumValue;
 import graphql.language.FloatValue;
 import graphql.language.IntValue;
 import graphql.language.ObjectField;
@@ -24,7 +25,8 @@ public class UnknownScalar implements TypeFunction {
   private static final GraphQLScalarType ATTRIBUTE_VALUE_SCALAR =
       GraphQLScalarType.newScalar()
           .name("Unknown")
-          .description("A value of unknown type: A string, int, float, boolean, array or object")
+          .description(
+              "A value of unknown type: A string, int, float, boolean, array, enum or object")
           .coercing(
               new Coercing<>() {
                 @Override
@@ -67,6 +69,9 @@ private <E> Object parseFromAst(Object input, Function<Exception, E> errorWrappe
                     return ((ArrayValue) input)
                         .getValues().stream().map(recurse).collect(Collectors.toUnmodifiableList());
                   }
+                  if (input instanceof EnumValue) {
+                    return ((EnumValue) input).getName();
+                  }
                   if (input instanceof ObjectValue) {
                     return ((ObjectValue) input)
                         .getObjectFields().stream()

hypertrace-core-graphql-common-schema/src/test/java/org/hypertrace/core/graphql/common/schema/scalars/UnknownScalarTest.java

@@ -54,6 +54,7 @@ void canDetermineIfConvertible() {
     assertFalse(this.unknownScalarFunction.canBuildType(Double.class, this.mockAnnotatedType));
     assertFalse(this.unknownScalarFunction.canBuildType(Boolean.class, this.mockAnnotatedType));
     assertFalse(this.unknownScalarFunction.canBuildType(List.class, this.mockAnnotatedType));
+    assertFalse(this.unknownScalarFunction.canBuildType(Enum.class, this.mockAnnotatedType));
   }
 
   @Test