#313 (#314)

Signed-off-by: Vishakha Karimungi <vishaaka@amazon.com>
Co-authored-by: Vishakha Karimungi <vishaaka@amazon.com>

Author: vish35

src/main/java/com/api/jsonata4java/expressions/functions/SpreadFunction.java

@@ -121,7 +121,7 @@ public ArrayNode addObject(ArrayNode result, ObjectNode obj) {
             String key = it.next();
             ObjectNode cell = JsonNodeFactory.instance.objectNode();
             cell.set(key, obj.get(key));
-            result = (ArrayNode) append(result, cell);
+            result = concat(result, cell);
         }
         return result;
     }
@@ -197,6 +197,7 @@ ArrayNode concat(ArrayNode base, JsonNode appendage) {
             result.add(elt);
         }
         if (appendage.isArray()) {
+            result.removeAll();
             for (JsonNode elt : appendage) {
                 result.add(elt);
             }

src/test/java/com/api/jsonata4java/expressions/functions/SpreadFunctionTest.java

@@ -0,0 +1,103 @@
+package com.api.jsonata4java.expressions.functions;
+
+import static com.api.jsonata4java.expressions.utils.Utils.test;
+
+import org.junit.Test;
+
+public class SpreadFunctionTest {
+
+    @Test
+    public void testSpreadForGeneratingCombinationList() throws Exception {
+        test("$spread($$.array1 ~> $map(function($v1) {\n" +
+                "            $$.array2 ~> $map(function($v2) {\n" +
+                "                $v1 & '#' & $v2\n" +
+                "            })\n" +
+                "        }))", "[\n" +
+                "  \"abcd#pp\",\n" +
+                "  \"abcd#uu\",\n" +
+                "  \"abcd#tt\",\n" +
+                "  \"abcd#uu\",\n" +
+                "  \"abcd#ww\",\n" +
+                "  \"abcd#gg\",\n" +
+                "  \"abcd#qq\",\n" +
+                "  \"abcd#nn\",\n" +
+                "  \"abcd#ff\",\n" +
+                "  \"cdef#pp\",\n" +
+                "  \"cdef#uu\",\n" +
+                "  \"cdef#tt\",\n" +
+                "  \"cdef#uu\",\n" +
+                "  \"cdef#ww\",\n" +
+                "  \"cdef#gg\",\n" +
+                "  \"cdef#qq\",\n" +
+                "  \"cdef#nn\",\n" +
+                "  \"cdef#ff\",\n" +
+                "  \"efgh#pp\",\n" +
+                "  \"efgh#uu\",\n" +
+                "  \"efgh#tt\",\n" +
+                "  \"efgh#uu\",\n" +
+                "  \"efgh#ww\",\n" +
+                "  \"efgh#gg\",\n" +
+                "  \"efgh#qq\",\n" +
+                "  \"efgh#nn\",\n" +
+                "  \"efgh#ff\",\n" +
+                "  \"ghij#pp\",\n" +
+                "  \"ghij#uu\",\n" +
+                "  \"ghij#tt\",\n" +
+                "  \"ghij#uu\",\n" +
+                "  \"ghij#ww\",\n" +
+                "  \"ghij#gg\",\n" +
+                "  \"ghij#qq\",\n" +
+                "  \"ghij#nn\",\n" +
+                "  \"ghij#ff\",\n" +
+                "  \"ijkl#pp\",\n" +
+                "  \"ijkl#uu\",\n" +
+                "  \"ijkl#tt\",\n" +
+                "  \"ijkl#uu\",\n" +
+                "  \"ijkl#ww\",\n" +
+                "  \"ijkl#gg\",\n" +
+                "  \"ijkl#qq\",\n" +
+                "  \"ijkl#nn\",\n" +
+                "  \"ijkl#ff\",\n" +
+                "  \"klmn#pp\",\n" +
+                "  \"klmn#uu\",\n" +
+                "  \"klmn#tt\",\n" +
+                "  \"klmn#uu\",\n" +
+                "  \"klmn#ww\",\n" +
+                "  \"klmn#gg\",\n" +
+                "  \"klmn#qq\",\n" +
+                "  \"klmn#nn\",\n" +
+                "  \"klmn#ff\",\n" +
+                "  \"mnop#pp\",\n" +
+                "  \"mnop#uu\",\n" +
+                "  \"mnop#tt\",\n" +
+                "  \"mnop#uu\",\n" +
+                "  \"mnop#ww\",\n" +
+                "  \"mnop#gg\",\n" +
+                "  \"mnop#qq\",\n" +
+                "  \"mnop#nn\",\n" +
+                "  \"mnop#ff\"\n" +
+                "]", null, "{\n" +
+                "  \"array1\": [\n" +
+                "    \"abcd\",\n" +
+                "    \"cdef\",\n" +
+                "    \"efgh\",\n" +
+                "    \"ghij\",\n" +
+                "    \"ijkl\",\n" +
+                "    \"klmn\",\n" +
+                "    \"mnop\"\n" +
+                "  ],\n" +
+                "  \"array2\": [\n" +
+                "    \"pp\",\n" +
+                "    \"uu\",\n" +
+                "    \"tt\",\n" +
+                "    \"uu\",\n" +
+                "    \"ww\",\n" +
+                "    \"gg\",\n" +
+                "    \"qq\",\n" +
+                "    \"nn\",\n" +
+                "    \"ff\"\n" +
+                "  ]\n" +
+                "}");
+    }
+
+}