BigDecimal coerce operation (#5786)

Author: yesamer

kie-dmn/kie-dmn-feel/src/main/java/org/kie/dmn/feel/util/EvalHelper.java

@@ -533,28 +533,35 @@ public static String lcFirst(final String name) {
     public static Boolean compare(Object left, Object right, EvaluationContext ctx, BiPredicate<Comparable, Comparable> op) {
         if ( left == null || right == null ) {
             return null;
-        } else if (left instanceof ChronoPeriod && right instanceof ChronoPeriod) {
+        }
+        if (left instanceof ChronoPeriod && right instanceof ChronoPeriod) {
             // periods have special compare semantics in FEEL as it ignores "days". Only months and years are compared
             Long l = ComparablePeriod.toTotalMonths((ChronoPeriod) left);
             Long r = ComparablePeriod.toTotalMonths((ChronoPeriod) right);
             return op.test( l, r );
-        } else if (left instanceof TemporalAccessor && right instanceof TemporalAccessor) {
+        }
+        if (left instanceof TemporalAccessor && right instanceof TemporalAccessor) {
             // Handle specific cases when both time / datetime
             TemporalAccessor l = (TemporalAccessor) left;
             TemporalAccessor r = (TemporalAccessor) right;
             if (BuiltInType.determineTypeFromInstance(left) == BuiltInType.TIME && BuiltInType.determineTypeFromInstance(right) == BuiltInType.TIME) {
                 return op.test(valuet(l), valuet(r));
             } else if (BuiltInType.determineTypeFromInstance(left) == BuiltInType.DATE_TIME && BuiltInType.determineTypeFromInstance(right) == BuiltInType.DATE_TIME) {
                 return op.test(valuedt(l, r.query(TemporalQueries.zone())), valuedt(r, l.query(TemporalQueries.zone())));
-            } // fallback; continue:
+            }
+        }
+        if (left instanceof Number && right instanceof Number) {
+            // Handle specific cases when both are Number, converting both to BigDecimal
+            BigDecimal l = getBigDecimalOrNull(left);
+            BigDecimal r = getBigDecimalOrNull(right);
+            return op.test(l, r);
         }
         // last fallback:
         if ((left instanceof String && right instanceof String) ||
-            (left instanceof Number && right instanceof Number) ||
             (left instanceof Boolean && right instanceof Boolean) ||
             (left instanceof Comparable && left.getClass().isAssignableFrom(right.getClass()))) {
-            Comparable l = (Comparable) left;
-            Comparable r = (Comparable) right;
+            Comparable<?> l = (Comparable<?>) left;
+            Comparable<?> r = (Comparable<?>) right;
             return op.test(l, r);
         }
         return null;

kie-dmn/kie-dmn-feel/src/test/java/org/kie/dmn/feel/util/EvalHelperTest.java

@@ -18,6 +18,7 @@
 
 import java.lang.reflect.Method;
 import java.math.BigDecimal;
+import java.math.BigInteger;
 
 import org.junit.Test;
 import org.kie.dmn.feel.lang.FEELProperty;
@@ -70,6 +71,22 @@ public void testGetGenericAccessor() throws NoSuchMethodException {
         assertThat(EvalHelper.getGenericAccessor(TestPojo.class, "feelPropertyIdentifier")).as("getGenericAccessor should work for methods annotated with '@FEELProperty'.").isEqualTo(expectedAccessor);
     }
 
+    @Test
+    public void testNumericValuesComparative() {
+        assertThat(EvalHelper.compare(BigDecimal.valueOf(1), BigDecimal.valueOf(2), null, (l, r) -> l.compareTo(r) < 0)).isTrue();
+        assertThat(EvalHelper.compare(1.0, 2.0, null, (l, r) -> l.compareTo(r) < 0)).isTrue();
+        assertThat(EvalHelper.compare(1, 2, null, (l, r) -> l.compareTo(r) > 0)).isFalse();
+        assertThat(EvalHelper.compare(BigDecimal.valueOf(1), 2, null, (l, r) -> l.compareTo(r) > 0)).isFalse();
+        assertThat(EvalHelper.compare(1, BigDecimal.valueOf(2), null, (l, r) -> l.compareTo(r) < 0)).isTrue();
+        assertThat(EvalHelper.compare(BigDecimal.valueOf(1), 2.3, null, (l, r) -> l.compareTo(r) == 0)).isFalse();
+        assertThat(EvalHelper.compare(1.2, BigDecimal.valueOf(1.2), null, (l, r) -> l.compareTo(r) == 0)).isTrue();
+        assertThat(EvalHelper.compare(BigDecimal.valueOf(1), 0L, null, (l, r) -> l.compareTo(r) > 0)).isTrue();
+        assertThat(EvalHelper.compare(10L, BigDecimal.valueOf(2), null, (l, r) -> l.compareTo(r) < 0)).isFalse();
+        assertThat(EvalHelper.compare(BigInteger.valueOf(1), BigInteger.valueOf(2), null, (l, r) -> l.compareTo(r) == 0)).isFalse();
+        assertThat(EvalHelper.compare(BigInteger.valueOf(1), 2, null, (l, r) -> l.compareTo(r) < 0)).isTrue();
+        assertThat(EvalHelper.compare(BigInteger.valueOf(1), 2.3, null, (l, r) -> l.compareTo(r) == 0)).isFalse();
+    }
+
     private static class TestPojo {
         @FEELProperty("feelPropertyIdentifier")
         public String getAProperty() {