[0.10.0] SHOW TAG KEYS doesn't work on partially-replicated cluster

[e-dard]

SHOW TAG KEYS does not work correctly when running on a partially replicated cluster. I've tested this on a 3-node cluster with a replication factor of 1.

Weirdly, even the node with the shard on it isn't able to return the tag keys.

Node 1:

> create database db
> use db
Using database db
> alter retention policy default on db REPLICATION 1
> insert cpu,tk=tv value=1
> show tag keys
ERR: write message type: write tcp [::1]:53109->[::1]:8288: use of closed network connection
> show measurements
name: measurements
------------------
name
cpu

>

Node 2 (after all commands on node 1 have completed):

> show tag keys
ERR: write message type: write tcp [::1]:53118->[::1]:8188: use of closed network connection
> show series
name: cpu
---------
_key        tk
cpu,tk=tv   tv

>

Node 3 (after all commands on node 1 have completed):

> show tag keys
ERR: write message type: write tcp [::1]:53193->[::1]:8288: use of closed network connection
> show series
> show measurements
name: measurements
------------------
name
cpu

>

Logs attached (no panics).

n1.txt
n2.txt
n3.txt

[jsternberg]

This should work as soon as #5811 gets merged since this command is already converted to the new query engine.

[jsternberg]

This works now that remote execution works since #5811, #5842, and #5843 have been merged.