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From: Pavel Stehule <[email protected]>
To: Erik Rijkers <[email protected]>
Cc: Michael Paquier <[email protected]>
Cc: Zhihong Yu <[email protected]>
Cc: Amit Kapila <[email protected]>
Cc: DUVAL REMI <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: proposal: schema variables
Date: Sat, 10 Apr 2021 08:58:41 +0200
Message-ID: <CAFj8pRCi-n6SzkAB+OHG=TZvL13xxta_qgffBLDOY0HEBqDhvg@mail.gmail.com> (raw)
In-Reply-To: <CAFj8pRBzKcqzj=23BHfv1QaXHt=2_SN=uhdR3rb_dAVQoit7ug@mail.gmail.com>
References: <CAFj8pRBoGBKopkiTa4ki3dMgy-cSTRZ-BQPKOq7=Tk0SSNsowA@mail.gmail.com>
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Hi

I am sending a strongly updated patch for schema variables.

I rewrote an execution of a LET statement. In the previous implementation I
hacked STMT_SELECT. Now, I introduced a new statement STMT_LET, and I
implemented a new executor node SetVariable. Now I think this
implementation is much cleaner. Implementation with own executor node
reduces necessary work on PL side - and allows the LET statement to be
prepared - what is important from a security view.

I'll try to write a second implementation based on a cleaner implementation
like utility command too. I expect so this version will be more simple, but
utility commands cannot be prepared, and probably, there should be special
support for any PL. I hope a cleaner implementation can help to move this
patch.

We can choose one variant in the next step and this variant can be
finalized.

Notes, comments?

Regards

Pavel


Attachments:

  [application/gzip] schema-variables-rev2-20210410.patch.gz (69.7K, 3-schema-variables-rev2-20210410.patch.gz)
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