ES|QL: Add unsigned long and mixed numeric types support to Decay function

x-pack/plugin/esql-core/src/main/java/org/elasticsearch/xpack/esql/core/type/DataType.java

@@ -633,6 +633,10 @@ public static boolean isSortable(DataType t) {
         return false == (t == SOURCE || isCounter(t) || isSpatialOrGrid(t) || t == AGGREGATE_METRIC_DOUBLE);
     }
 
+    public static boolean isUnsignedLong(DataType t) {
+        return t == UNSIGNED_LONG;
+    }
+
     public String nameUpper() {
         return name;
     }

x-pack/plugin/esql/qa/testFixtures/src/main/resources/decay.csv-spec

@@ -24,6 +24,28 @@ decay_result:double
 0.75
 ;
 
+intLinearMixedNumericTypes1
+required_capability: decay_function
+
+ROW value = 5
+| EVAL decay_result = decay(value, 10::double, 10::long, {"offset": 0, "decay": 0.5, "type": "linear"}) 
+| KEEP decay_result;
+
+decay_result:double
+0.75
+;
+
+intLinearMixedNumericTypes2
+required_capability: decay_function
+
+ROW value = 5
+| EVAL decay_result = decay(value, 10::unsigned_long, 10::long, {"offset": 0, "decay": 0.5, "type": "linear"}) 
+| KEEP decay_result;
+
+decay_result:double
+0.75
+;
+
 intExp
 required_capability: decay_function
 
@@ -166,6 +188,28 @@ decay_result:double
 0.75
 ;
 
+doubleLinearMixedNumericTypes1
+required_capability: decay_function
+
+ROW value = 5.0
+| EVAL decay_result = decay(value, 10.0::int, 10.0::long, {"offset": 0.0, "decay": 0.5, "type": "linear"}) 
+| KEEP decay_result;
+
+decay_result:double
+0.75
+;
+
+doubleLinearMixedNumericTypes2
+required_capability: decay_function
+
+ROW value = 5.0
+| EVAL decay_result = decay(value, 10.0::int, 10.0::unsigned_long, {"offset": 0.0, "decay": 0.5, "type": "linear"}) 
+| KEEP decay_result;
+
+decay_result:double
+0.75
+;
+
 doubleExp
 required_capability: decay_function
 
@@ -199,6 +243,61 @@ decay_result:double
 1.0
 ;
 
+longLinearMixedNumericTypes1
+required_capability: decay_function
+
+ROW value = 15::long
+| EVAL decay_result = decay(value, 10::int, 10::unsigned_long, {"offset": 10000000000, "decay": 0.5, "type": "linear"}) 
+| KEEP decay_result;
+
+decay_result:double
+1.0
+;
+
+longLinearMixedNumericTypes2
+required_capability: decay_function
+
+ROW value = 15::long
+| EVAL decay_result = decay(value, 10::double, 10::int, {"offset": 10000000000, "decay": 0.5, "type": "linear"}) 
+| KEEP decay_result;
+
+decay_result:double
+1.0
+;
+
+unsignedLongLinear
+required_capability: decay_function
+
+ROW value = 15::unsigned_long
+| EVAL decay_result = decay(value, 10::unsigned_long, 10::unsigned_long, {"offset": 18446744073709551615, "decay": 0.5, "type": "linear"}) 
+| KEEP decay_result;
+
+decay_result:double
+1.0
+;
+
+unsignedLongLinearMixedNumericTypes1
+required_capability: decay_function
+
+ROW value = 15::unsigned_long
+| EVAL decay_result = decay(value, 10::long, 10::integer, {"offset": 18446744073709551615, "decay": 0.5, "type": "linear"}) 
+| KEEP decay_result;
+
+decay_result:double
+1.0
+;
+
+unsignedLongLinearMixedNumericTypes2
+required_capability: decay_function
+
+ROW value = 15::unsigned_long
+| EVAL decay_result = decay(value, 10::double, 10::integer, {"offset": 18446744073709551615, "decay": 0.5, "type": "linear"}) 
+| KEEP decay_result;
+
+decay_result:double
+1.0
+;
+
 cartesianPointLinear1
 required_capability: decay_function