[Sqlalchemy-tickets] Issue #4038: Additional dialect kwargs are not reflected (zzzeek/sqlalchemy)

[chebee7i <iss...@bi...>]

New issue 4038: Additional dialect kwargs are not reflected
https://bitbucket.org/zzzeek/sqlalchemy/issues/4038/additional-dialect-kwargs-are-not

chebee7i:

Some keyword kwargs like 'mysql_partition_by' and 'mysql_stats_sample_pages' are not reflected and stored in kwargs.

```
#!python

import sqlalchemy as sa
m = sa.MetaData()

t = sa.Table('ti', m,
    sa.Column('id', sa.Integer),
    sa.Column('amount', sa.DECIMAL(7, 2)),
    sa.Column('tr_date', sa.Date),
    mysql_engine='InnoDB',
    mysql_partition_by='HASH( MONTH(tr_date) )',
    mysql_partitions='6'
)

engine = ...
t.create(engine)
m2 = sa.Metadata(bind=engine, reflect=True)
assert 'mysql_partition_by' in m2.tables['ti'].kwargs  # AssertionError
```