From: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com> |
---|---|
To: | Stephen Froehlich <s(dot)froehlich(at)cablelabs(dot)com> |
Cc: | "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: PG 10 - Trouble with overlap of range partition of two dimensions |
Date: | 2017-10-31 22:05:31 |
Message-ID: | CAB7nPqRZrMJxTnn-Co_tLQ9sPYcOZk=0tRoJFKREDvv2kH35YA@mail.gmail.com |
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On Tue, Oct 31, 2017 at 8:36 PM, Stephen Froehlich
<s(dot)froehlich(at)cablelabs(dot)com> wrote:
> CREATE TABLE lotsa_data_20171027_src3 PARTITION OF lotsa_data
> FOR VALUES FROM ('2017-10-26 18:00:00-06', 3) TO ('2017-10-27
> 17:59:59.999-06', 3);
> ERROR: partition " lotsa_data_20171027_src1" would overlap partition
> "lotsa_data_20171027_src3"
>
> Why am I getting this error?
The answer is in the documentation:
https://www.postgresql.org/docs/devel/static/sql-createtable.html
The rules of such partitions is bound to row-wise comparisons. "For
example, given PARTITION BY RANGE (x,y), a partition bound FROM (1, 2)
TO (3, 4) allows x=1 with any y>=2, x=2 with any non-null y, and x=3
with any y<4."
So in your example and by comparing with the docs, the first partition
allows start_time = '2017-10-26 18:00:00-06' with source_no >= 1, and
the second partition allows source_no >= 3 which overlaps with the
first one.
--
Michael
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