feat: support single-argument properties() for node, rel, and struct

src/content/docs/cypher/expressions/node-rel-functions.md

@@ -10,6 +10,7 @@ The following functions are used to get information about nodes and relationship
 | `ID` | returns the internal ID of node/rel | |
 | `LABEL` | returns the label name of node/relationship | `LABELS` |
 | `OFFSET` | returns the offset of the internal ID | |
+| `PROPERTIES` | returns a struct of all user-defined properties of node/rel | |
 
 See below for more details on each of these functions.
 
@@ -77,3 +78,25 @@ MATCH (a) RETURN OFFSET(ID(a)) AS OFFSET LIMIT 1;
 │ 0      │
 └────────┘
 ```
+
+## PROPERTIES
+
+Returns a `STRUCT` containing all user-defined properties of a node or relationship, omitting internal metadata columns (`_ID`, `_LABEL`, `_SRC`, `_DST`).
+
+| Input type | Output type |
+| --- | --- |
+| `NODE` | `STRUCT` |
+| `REL` | `STRUCT` |
+
+```cypher
+MATCH (a:User {name: 'Alice'}) RETURN PROPERTIES(a) AS props;
+```
+
+```table
+┌───────────────────────────────────────────┐
+│ props                                     │
+│ STRUCT(name STRING, age INT64)            │
+├───────────────────────────────────────────┤
+│ {name: Alice, age: 30}                    │
+└───────────────────────────────────────────┘
+```

src/content/docs/cypher/expressions/struct-functions.md

@@ -21,5 +21,6 @@ The functions that can be used with structs are as follows:
 | Function | Description | Example | Result |
 | ----------- | ----------- |  ----------- |  ----------- |
 | `struct_extract(struct, 'field_name')` | Extracts named field from struct | `struct_extract({name: 'Alice', age: 20}, 'name')` | `'Alice'` |
+| `properties(struct)` | Returns the struct of properties | `properties({name: 'Alice', age: 20})` | `{name: Alice, age: 20}` |
 
 </div>