support of empty list

[wey-gu]

This [] seems to be a straightforward expression/alias, rather than collect(NULL), and it's valid in n4j.

(root@nebula) [amundsen]> return collect(NULL)
+---------------+
| collect(NULL) |
+---------------+
| []            |
+---------------+
Got 1 rows (time spent 354/39434 us)

Sat, 25 Dec 2021 15:51:50 CST

(root@nebula) [amundsen]> return range(1,0)
+------------+
| range(1,0) |
+------------+
| []         |
+------------+
Got 1 rows (time spent 288/32831 us)

Sat, 25 Dec 2021 15:52:03 CST

(root@nebula) [amundsen]> return []
[ERROR (-1004)]: SyntaxError: syntax error near `]'

Sat, 25 Dec 2021 15:52:07 CST

[jievince]

Please have a look at #2894, see why we don't support empty list.

[wey-gu]

Thanks a lot @jievince! Got it:) closing it.

[wey-gu]

@jievince should we reopen this now to make it more cypher compatible?