Github user arina-ielchiieva commented on the pull request:
https://github.com/apache/drill/pull/474#issuecomment-208521519
I thought it's hard to maintain backward compatibility. Quoting Parth
comment from Jira:
"Drill needs to be able to run queries that depend only on features that
are in the oldest version of Drill in the cluster. Say for example, most
drillbits are at version N and some are at version N+1. You added support for a
new type foo in version N+1. Any queries not using or depending on type foo
should run successfully. Queries depending on foo can only run successfully
after all the drillbits are upgraded to N+1."
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