citusdata / citusdata/pg_shard

Support "UPSERT"

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Description

I'm sure some bugs could shake out of #137, but for now all the tests are passing and `pg_shard` appears usable under PostgreSQL 9.5alpha2. With this in mind, can we figure out how to get the new "UPSERT"-style feature of 9.5 working in `pg_shard`? Many uses of this feature will be idempotent (and commutable? Can we detect?) which is huge from a distributed systems standpoint.

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