Github user JamesRTaylor commented on the pull request:
https://github.com/apache/phoenix/pull/104#issuecomment-128869235
The system tables need to be able to store the tenant ID regardless of its
type in the data table, so it wouldn't make sense to type the system tables
(i.e. the *all* approach isn't viable IMHO). If a table already exists with a
different typed leading column than CHAR/VARCHAR, then it would not be possible
to map a multi-tenant Phoenix table to it. This just provides a little bit more
flexibility. I'll ping the original filer of the JIRA and see if he has further
comment on his use case.
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