Delete tag from multiple vertices produces Invalid result

[Aiee]

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Describe the bug (required)

Your Environments (required)

• OS: uname -a
• Compiler: g++ --version or clang++ --version
• CPU: lscpu
• Commit id (e.g. a3ffc7d8) aeacff2

How To Reproduce(required)

Steps to reproduce the behavior:

(root@nebula) [nba]>       FETCH PROP ON player "Tim Duncan" YIELD player.name, player.age

+--------------+------------+
| player.name  | player.age |
+--------------+------------+
| "Tim Duncan" | 42         |
+--------------+------------+
Got 1 rows (time spent 9.768ms/10.481071ms)

Mon, 16 Jan 2023 17:01:48 CST

(root@nebula) [nba]>       FETCH PROP ON player "Tony Parker" YIELD player.name, player.age
+---------------+------------+
| player.name   | player.age |
+---------------+------------+
| "Tony Parker" | 36         |
+---------------+------------+
Got 1 rows (time spent 3.767ms/4.299134ms)

Mon, 16 Jan 2023 17:02:24 CST

(root@nebula) [nba]> 
(root@nebula) [nba]>       DELETE TAG player FROM "Tim Duncan", "Tony Parker";
Execution succeeded (time spent 5.867ms/6.275803ms)

Mon, 16 Jan 2023 17:21:38 CST

(root@nebula) [nba]>       FETCH PROP ON player "Tim Duncan" YIELD player.name, player.age

+-------------+------------+
| player.name | player.age |
+-------------+------------+
|             |            |
+-------------+------------+
Got 1 rows (time spent 4.478ms/4.93895ms)

Mon, 16 Jan 2023 17:21:41 CST

(root@nebula) [nba]>       FETCH PROP ON player "Tony Parker" YIELD player.name, player.age
+-------------+------------+
| player.name | player.age |
+-------------+------------+
+-------------+------------+
Empty set (time spent 4.355ms/4.910096ms)

Expected behavior

FETCH PROP ON player "Tim Duncan" YIELD player.name, player.age should return an empty set

Additional context

[czpmango]

IMHO, returning one empty row is somewhat expected.
But, we should redefine the behavior of the RPC interface getProps and make it clearer.

[Aiee]

This is by design, Tim Duncan has multiple tags, so we return the empty row to indicate the vertex still exists, while Tony Parker has only one tag named player.

[xtcyclist]

Close this issue as it is by design and won't fix.