Re: why does seq scan instead of index scan

Thank you for your response.

Are there any technique to index that query for like search on Text[]
Columns?

Thanks.

Nakagawa Maskai

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From: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Sent: Saturday, January 15, 2011 2:56 AM
To: "中川　誠貴" <nakagawa(at)ivp(dot)co(dot)jp>
Cc: <pgsql-sql(at)postgresql(dot)org>
Subject: Re: [SQL] why does seq scan instead of index scan

> =?iso-2022-jp?B?GyRCQ2ZAbiEhQD81LhsoQg==?= <nakagawa(at)ivp(dot)co(dot)jp> writes:
>> I'm trying to use like 'xx%' search on Text[] column.
>> I thought it uses index scan. But actually it uses seq scan.
>
>> Why?
>
> Those ANY expressions are not indexable.
>
> regards, tom lane
>
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