| From: | Heikki Linnakangas <hlinnakangas(at)vmware(dot)com> |
|---|---|
| To: | Ravi Kiran <ravi(dot)kolanpaka(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: NODE |
| Date: | 2015-01-05 19:32:56 |
| Message-ID: | 54AAE6E8.9010006@vmware.com |
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| Lists: | pgsql-hackers |
On 01/05/2015 09:28 PM, Ravi Kiran wrote:
> hi,
>
> I am going through the hashjoin algorithm in postgres. I find a function
> ExecHashjoin , which is called each time a new tuple is required by the
> hash join *Node.*
>
> could someone explain what exactly node mean in postgres.
See src/backend/nodes/. It's a mechanism that imitates class inheritance
in object-oriented languages. Node is the superclass that everything
else inherits from. Every Node type supports some basic operations like
copy, equals and serialization to/from text.
- Heikki
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