RE: Is querying SPITupleTable with SQL possible?

From: "Wu, Fei" <wufei(dot)fnst(at)cn(dot)fujitsu(dot)com>
To: Tom Mercha <mercha_t(at)hotmail(dot)com>
Cc: "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: RE: Is querying SPITupleTable with SQL possible?
Date: 2019-12-20 01:53:44
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I have had see your discussion about node EphemeralNamedRelation with the Community.
Now, I want to use this node in SQL(for test), I have saw the manual but could not understand,
can you show me a example on how to use it in SQL?

Thanks a lot~

Regards, wu fei

-----Original Message-----
From: Tom Mercha [mailto:mercha_t(at)hotmail(dot)com]
Sent: 2019年10月3日 2:53
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Is querying SPITupleTable with SQL possible?

On 02/10/2019 16:11, Tom Lane wrote:
> Tom Mercha <mercha_t(at)hotmail(dot)com> writes:
>> I am using PostgreSQL's SPI to execute a simple SQL query (SELECT *
>> ...) via SPI_exec. As a a result, I get an SPITupleTable with the
>> results of my query.
>> Now that I have the SPITupleTable, I was wondering if it would be
>> possible to later query over it further in my SQL statements using
>> SPI, for example, something a bit similar to SPI_Exec ("Select * FROM
>> :mySPITupleTable", 0);
> It's possible you could use the "transition table" (aka
> EphemeralNamedRelation) infrastructure for this, though I'm not sure
> if it's really a close fit, or whether it's been built out enough to
> support this usage. From memory, it wants to work with tuplestores,
> which are a bit heavier-weight than SPITupleTables.
> regards, tom lane

Thanks for this feedback! The EphemeralNamedRelation seems that it could be a good fit for what I'm looking for.

However, I'm not quite so sure how I can query over the EphemeralNamedRelation using SQL? Could someone indicate where I can find an example?


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