Add support for CREATE TABLE LIKE

[clifff]

We are using pg_chameleon to replicate data from a MySQL DB that ingests data from a third party, and noticed that replication crashed whenever we got a CREATE TABLE table LIKE other_table queries.

Rollbar backtrace:

The replica process crashed.
 Source: mysql
 Stack trace: Traceback (most recent call last):
  File "/usr/local/lib/python3.5/dist-packages/pg_chameleon/lib/global_lib.py", line 487, in read_replica
    self.mysql_source.read_replica()
  File "/usr/local/lib/python3.5/dist-packages/pg_chameleon/lib/mysql_lib.py", line 1336, in read_replica
    replica_data=self.__read_replica_stream(batch_data)
  File "/usr/local/lib/python3.5/dist-packages/pg_chameleon/lib/mysql_lib.py", line 1157, in __read_replica_stream
    sql_tokeniser.parse_sql(binlogevent.query)
  File "/usr/local/lib/python3.5/dist-packages/pg_chameleon/lib/sql_util.py", line 489, in parse_sql
    create_parsed=self.parse_create_table(stat_cleanup, stat_dic["name"])
  File "/usr/local/lib/python3.5/dist-packages/pg_chameleon/lib/sql_util.py", line 278, in parse_create_table
    inner_stat = m_inner.group(1).strip()
AttributeError: 'NoneType' object has no attribute 'group'

I was able to recreate this locally using a Docker mysql container run with docker run --env MYSQL_ALLOW_EMPTY_PASSWORD=true -p 3306:3306 -v $(pwd)/tests/my5.7.cnf:/etc/mysql/my.cnf -v $(pwd)/sakila-db:/docker-entrypoint-initdb.d mysql:5.7 and mysql -u root -h 127.0.0.1 -e "DROP TABLE IF EXISTS clone_actor; CREATE TABLE clone_actor LIKE actor" sakila

I think this adds full support for the CREATE TABLE LIKE syntax, although for our purposes, it's outside the whitelist of tables we want to replicate so my main goal here is to prevent the process from crashing.

[the4thdoctor]

why the not None in the check?
using if like_match: should do the same and in a clearer way

[Iced-Sun]

Isn't this already merged?

[clifff]

Isn't this already merged?

I don't believe so. AWS DMS ended up being a better solution for my use case than pg_chameleon, so I don't plan on making any updates to this PR. Will close for now, but if anyone wants to fork/update to get it merged, feel free.