[openCypher tck case] empty map

[czpmango]

neo4j test:

neo4j@neo4j> RETURN {};
+----+
| {} |
+----+
| {} |
+----+

neo4j@neo4j> RETURN {a1: {a2: {a3: {a4: {a5: {a6: {}}}}}}} AS literal;
+----------------------------------------+
| literal                                |
+----------------------------------------+
| {a1: {a2: {a3: {a4: {a5: {a6: {}}}}}}} |
+----------------------------------------+

nebula test:

(czp@nebula) [nba]> yield {}
[ERROR (-7)]: SyntaxError: syntax error near `}'

(czp@nebula) [nba]> yield {a1: {a2: {a3: {a4: {a5: {a6: {}}}}}}} AS literal;
[ERROR (-7)]: SyntaxError: syntax error near `}}}}}}} '

[Shylock-Hg]

There is a different with cypher, we has set type that empty set literal is same with empty map.