| From: | "Jie Zhang" <jzhang(at)greenplum(dot)com> |
|---|---|
| To: | "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | "Gavin Sherry" <swm(at)linuxworld(dot)com(dot)au>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: [PATCHES] WIP: bitmap indexes |
| Date: | 2006-08-17 19:42:20 |
| Message-ID: | C10A14AC.A608%jzhang@greenplum.com |
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| Lists: | pgsql-hackers pgsql-patches |
On 8/17/06 12:29 PM, "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> "Jie Zhang" <jzhang(at)greenplum(dot)com> writes:
>> This sounds good. Another problem is about ScalarArrayOpExpr support in
>> current nodeBitmapIndexscan. This will not work for stream bitmaps.
>
> Sure it will; it's just an OR.
>
Yes, it is just an OR. But we have to introduce an OR logic in
nodeBitmapIndexscan node for stream bitmaps. We can't do what it is done
right now: scanning the underline index one key at a time. We have to scan
the underline index for all keys at the same time. It seems simply that we
just introduce another BitmapOr in the path.
Thanks,
Jie
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