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From 0x0FFF <...@git.apache.org>
Subject [GitHub] incubator-hawq pull request: [HAWQ-19] Money type overflow fixed b...
Date Wed, 03 Feb 2016 08:26:46 GMT
Github user 0x0FFF commented on the pull request:

    Speaking about this specific case: do we plan an upgrade path from HAWQ 1.x to 2.0? If
no, then this PR can be easily merged into 2.0. If yes, we should really care about the upgrade
path, and maybe the better solution here would be the following: instead of changing existing
data type introduce new one, like "money8" for 8-byte money data type. This would again be
a catalog change (for example, in pg_type), but still won't affect the customers using old
data type "money" and layout of their existing tables
    Generally speaking, I agree that this is a tough question. Postgres is not a very good
example here - you can easily do pg_dump and pg_restore there as the data volumes it operates
with are usually quite small. As of HAWQ, making dump and restore to accommodate storage format
change can't be an option as we might have hundreds of TB there.

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