fix allowed append vl pk or el sk as nullable props

hugegraph-core/src/main/java/com/baidu/hugegraph/schema/builder/EdgeLabelBuilder.java

@@ -466,11 +466,15 @@ private void checkNullableKeys(Action action) {
                         "must belong to the origin/new properties: %s/%s ",
                         this.nullableKeys, originProps, appendProps);
 
-        E.checkArgument(!CollectionUtil.hasIntersection(this.sortKeys,
+        List<String> sortKeys = edgeLabel == null ?
+                                this.sortKeys :
+                                this.graph()
+                                    .mapPkId2Name(edgeLabel.sortKeys());
+        E.checkArgument(!CollectionUtil.hasIntersection(sortKeys,
                                                         this.nullableKeys),
                         "The nullableKeys: %s are not allowed to " +
                         "belong to sortKeys: %s of edge label '%s'",
-                        this.nullableKeys, this.sortKeys, this.name);
+                        this.nullableKeys, sortKeys, this.name);
 
         if (action == Action.APPEND) {
             Collection<String> newAddedProps = CollectionUtils.subtract(

hugegraph-core/src/main/java/com/baidu/hugegraph/schema/builder/VertexLabelBuilder.java

@@ -461,11 +461,15 @@ private void checkNullableKeys(Action action) {
                         "must belong to the origin/new properties: %s/%s",
                         this.nullableKeys, originProps, appendProps);
 
-        E.checkArgument(!CollectionUtil.hasIntersection(this.primaryKeys,
+        List<String> primaryKeys = vertexLabel == null ?
+                                   this.primaryKeys :
+                                   this.graph()
+                                       .mapPkId2Name(vertexLabel.primaryKeys());
+        E.checkArgument(!CollectionUtil.hasIntersection(primaryKeys,
                                                         this.nullableKeys),
                         "The nullableKeys: %s are not allowed to " +
                         "belong to primaryKeys: %s of vertex label '%s'",
-                        this.nullableKeys, this.primaryKeys, this.name);
+                        this.nullableKeys, primaryKeys, this.name);
 
         if (action == Action.APPEND) {
             Collection<String> newAddedProps = CollectionUtils.subtract(

hugegraph-test/src/main/java/com/baidu/hugegraph/core/EdgeLabelCoreTest.java

@@ -765,6 +765,31 @@ public void testAppendEdgeLabelWithNonNullProperties() {
 
     }
 
+    @Test
+    public void testAppendEdgeLabelWithSkAsNullableProperties() {
+        super.initPropertyKeys();
+        SchemaManager schema = graph().schema();
+        schema.vertexLabel("person")
+              .properties("name", "age", "city")
+              .primaryKeys("name")
+              .create();
+        schema.vertexLabel("book").properties("id", "name")
+              .primaryKeys("id").create();
+        schema.edgeLabel("look")
+              .properties("time")
+              .link("person", "book")
+              .multiTimes().sortKeys("time")
+              .create();
+
+        Assert.assertThrows(IllegalArgumentException.class, () -> {
+            schema.edgeLabel("look")
+                  .properties("time", "weight")
+                  .nullableKeys("time", "weight")
+                  .append();
+        });
+
+    }
+
     @Test
     public void testRemoveEdgeLabel() {
         super.initPropertyKeys();

hugegraph-test/src/main/java/com/baidu/hugegraph/core/VertexLabelCoreTest.java

@@ -737,6 +737,23 @@ public void testAppendVertexLabelWithNonNullProperties() {
         });
     }
 
+    @Test
+    public void testAppendVertexLabelWithPkAsNullableProperties() {
+        super.initPropertyKeys();
+        SchemaManager schema = graph().schema();
+
+        schema.vertexLabel("person")
+              .properties("name", "age")
+              .primaryKeys("name")
+              .create();
+        Assert.assertThrows(IllegalArgumentException.class, () -> {
+            schema.vertexLabel("person")
+                  .properties("name", "city")
+                  .nullableKeys("name", "city")
+                  .append();
+        });
+    }
+
     @Test
     public void testRemoveVertexLabel() {
         super.initPropertyKeys();