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Re: [HACKERS] PATCH: enabling parallel execution for cursorsexplicitly (experimental) - Mailing list pgsql-hackers

From Robert Haas
Subject Re: [HACKERS] PATCH: enabling parallel execution for cursorsexplicitly (experimental)
Date
Msg-id CA+TgmoYWoqDUViwPTk-rOJbGG8aqEVAQWBgauVbYaUxznSA==g@mail.gmail.com
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In response to Re: [HACKERS] PATCH: enabling parallel execution for cursorsexplicitly (experimental)  (Craig Ringer <craig@2ndquadrant.com>)
Responses Re: [HACKERS] PATCH: enabling parallel execution for cursorsexplicitly (experimental)  (Simon Riggs <simon@2ndquadrant.com>)
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On Wed, Nov 1, 2017 at 7:49 AM, Craig Ringer <craig@2ndquadrant.com> wrote:
> If the client wants to fetch in chunks it can use a portal and limited
> size fetches. That shouldn't (?) be parallel-unsafe, since nothing
> else can happen in the middle anyway.

I believe sending a limited-size fetch forces serial execution
currently.  If it's true that nothing else can happen in the middle
then we could relax that, but I don't see why that should be true?

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company


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