New measurements in my database? Cannot delete empty measurement?

I have some new measurements in my database.

  1. I guess these have been created when I enabled some debugging option?

  2. Seems I cannot delete them

show measurements;
name: measurements
name


ceph_value
cpu_value
database
disk_io_time
disk_read
disk_value
disk_weighted_io_time
disk_write
freeipmi_value
interface_rx
interface_tx
ipmi_value
load_longterm
load_midterm
load_shortterm
memory_value
shard
syslog
tsm1_cache
tsm1_engine
tsm1_filestore
tsm1_wal
write

select * from shard
ERR: error parsing query: found SHARD, expected identifier at line 1, char 15
DROP MEASUREMENT shard;
ERR: error parsing query: found SHARD, expected identifier at line 1, char 18
select * from write
ERR: error parsing query: found WRITE, expected identifier at line 1, char 15
DROP MEASUREMENT write;
ERR: error parsing query: found WRITE, expected identifier at line 1, char 18

These I could delete

DROP MEASUREMENT httpd;
DROP MEASUREMENT cq;
DROP MEASUREMENT collectd;
DROP MEASUREMENT subscriber;
DROP MEASUREMENT queryExecutor;
DROP MEASUREMENT runtime;

Hey there,
I am using the influxdb version 1.5.2 and facing similar issue as mentioned by you.
Were you able to drop those empty measurements now?

-Avin