Re: [HACKERS] Re: [SQL] Functional Indexes

From: Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us>
To: tgl(at)sss(dot)pgh(dot)pa(dot)us (Tom Lane)
Cc: bryan(at)arcamax(dot)com, pgsql-sql(at)hub(dot)org, pgsql-hackers(at)postgreSQL(dot)org
Subject: Re: [HACKERS] Re: [SQL] Functional Indexes
Date: 1999-03-15 14:53:15
Message-ID: 199903151453.JAA12863@candle.pha.pa.us
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On the TODO list:

* allow creation of functional indexes to use default types

> "Bryan White" <bryan(at)arcamax(dot)com> writes:
> > The documentation for CREATE INDEX implies that functions are allowed in
> > index definitions but when I execute:
> > create unique index idxtest on customer (lower(email));
> > the result is:
> > ERROR: DefineIndex: (null) class not found
> > Should this work? Do I have the syntax wrong?
>
> I tried this wih 6.4.2 and found that it was only accepted if I
> explicitly identified which index operator class to use:
>
> play=> create table customer (email text);
> CREATE
> play=> create unique index idxtest on customer (lower(email));
> ERROR: DefineIndex: class not found
> play=> create unique index idxtest on customer (lower(email) text_ops);
> CREATE
> play=>
>
> That'll do as a workaround for Bryan, but isn't this a bug? Surely
> the system ought to know what type the result of lower() is...
>
> regards, tom lane
>
>

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Bruce Momjian | http://www.op.net/~candle
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