Shrink char field max length for Oracle DB support

Shrink char field max length for ORACLE

when running 

+ /opt/cloudera/parcels/CDH-6.0.x-1.cdh6.0.x.p0.414838/lib/hue/build/env/bin/hue migrate
Traceback (most recent call last):
File "/opt/cloudera/parcels/CDH-6.0.x-1.cdh6.0.x.p0.414838/lib/hue/build/env/bin/hue", line 14, in <module>
load_entry_point('desktop', 'console_scripts', 'hue')()
File "/opt/cloudera/parcels/CDH-6.0.x-1.cdh6.0.x.p0.414838/lib/hue/desktop/core/src/desktop/manage_entry.py", line 145, in entry
execute_from_command_line(sys.argv)
File "/opt/cloudera/parcels/CDH-6.0.x-1.cdh6.0.x.p0.414838/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/core/management/_init_.py", line 363, in execute_from_command_line
utility.execute()
File "/opt/cloudera/parcels/CDH-6.0.x-1.cdh6.0.x.p0.414838/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/core/management/_init_.py", line 355, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/opt/cloudera/parcels/CDH-6.0.x-1.cdh6.0.x.p0.414838/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/core/management/base.py", line 283, in run_from_argv
self.execute(*args, **cmd_options)
File "/opt/cloudera/parcels/CDH-6.0.x-1.cdh6.0.x.p0.414838/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/core/management/base.py", line 330, in execute
output = self.handle(*args, **options)
File "/opt/cloudera/parcels/CDH-6.0.x-1.cdh6.0.x.p0.414838/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/core/management/commands/migrate.py", line 204, in handle
fake_initial=fake_initial,
File "/opt/cloudera/parcels/CDH-6.0.x-1.cdh6.0.x.p0.414838/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/db/migrations/executor.py", line 115, in migrate
state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
File "/opt/cloudera/parcels/CDH-6.0.x-1.cdh6.0.x.p0.414838/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/db/migrations/executor.py", line 145, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
File "/opt/cloudera/parcels/CDH-6.0.x-1.cdh6.0.x.p0.414838/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/db/migrations/executor.py", line 244, in apply_migration
state = migration.apply(state, schema_editor)
File "/opt/cloudera/parcels/CDH-6.0.x-1.cdh6.0.x.p0.414838/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/db/migrations/migration.py", line 129, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "/opt/cloudera/parcels/CDH-6.0.x-1.cdh6.0.x.p0.414838/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/db/migrations/operations/models.py", line 97, in database_forwards
schema_editor.create_model(model)
File "/opt/cloudera/parcels/CDH-6.0.x-1.cdh6.0.x.p0.414838/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/db/backends/base/schema.py", line 302, in create_model
self.execute(sql, params or None)
File "/opt/cloudera/parcels/CDH-6.0.x-1.cdh6.0.x.p0.414838/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/db/backends/base/schema.py", line 119, in execute
cursor.execute(sql, params)
File "/opt/cloudera/parcels/CDH-6.0.x-1.cdh6.0.x.p0.414838/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "/opt/cloudera/parcels/CDH-6.0.x-1.cdh6.0.x.p0.414838/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/db/utils.py", line 94, in _exit_
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/opt/cloudera/parcels/CDH-6.0.x-1.cdh6.0.x.p0.414838/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/db/backends/utils.py", line 63, in execute
return self.cursor.execute(sql)
File "/opt/cloudera/parcels/CDH-6.0.x-1.cdh6.0.x.p0.414838/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/db/backends/oracle/base.py", line 479, in execute
return self.cursor.execute(query, self._param_generator(params))
django.db.utils.DatabaseError: ORA-00910: specified length too long for its datatype