'Lost connection to MySQL server during query' while executing query in pool

[igorcoding]

Problem is that when trying to execute query using pool (created by mysql.pool_create) the following error is raised: error: Lost connection to MySQL server during query.
Doing the exact same query inside a connection created by mysql.connect goes fine.
This is a log of what I see:

 $ tarantool
tarantool: version 1.7.2-282-g45423ce
type 'help' for interactive help
tarantool> mysql = require('mysql')
---
...

tarantool> pool = mysql.pool_create({ host = '127.0.0.1', user = '<user>', password = '<pass>', db = '<db>', size = 2 })
---
...

tarantool> pool
---
- host: 127.0.0.1
  db: <db>
  size: 2
  pass: '<pass>'
  user: <user>
  queue: 'channel: 2'
  usable: true
...

tarantool> conn = pool:get()
---
...

tarantool> conn
---
- queue: 'channel: 1'
  __gc_hook: null
  usable: true
  conn: 'MYSQL: 0x01cb5070'
...

tarantool> conn:execute("SELECT ? AS a, 'xx' AS b, NULL as c", 42)
---
- error: Lost connection to MySQL server during query
...