From: | Bruce Momjian <bruce(at)momjian(dot)us> |
---|---|
To: | Juho Saarikko <juhos(at)mbnet(dot)fi> |
Cc: | pgsql-bugs(at)postgresql(dot)org |
Subject: | Re: BUG #3965: UNIQUE constraint fails on long column values |
Date: | 2008-02-18 22:12:28 |
Message-ID: | 200802182212.m1IMCSD14587@momjian.us |
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Lists: | pgsql-bugs pgsql-docs |
Juho Saarikko wrote:
> While I didn't test, I'd imagine that this would also mean that any attempt
> to insert such values to an already unique column would fail.
Works here in 8.3:
test=> create table test (x text unique);
NOTICE: CREATE TABLE / UNIQUE will create implicit index "test_x_key" for table "test"
CREATE TABLE
test=> insert into test values (repeat('a', 50000));
INSERT 0 1
Even this works:
test=> insert into test values (repeat('a', 50000) || 'b');
I believe the index only indexes 8192 bytes but checks the heap for
longer values to check the full length.
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://postgres.enterprisedb.com
+ If your life is a hard drive, Christ can be your backup. +
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