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Re: what is sublinks in query planner? - Mailing list pgsql-general

From Tom Lane
Subject Re: what is sublinks in query planner?
Date
Msg-id 27942.1396036578@sss.pgh.pa.us
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In response to what is sublinks in query planner?  (Sandeep Gupta <gupta.sandeep@gmail.com>)
Responses Re: what is sublinks in query planner?  (Sandeep Gupta <gupta.sandeep@gmail.com>)
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Sandeep Gupta <gupta.sandeep@gmail.com> writes:
>  I looked for description of sublinks in the code as well as online but
> failed to come with any information. Was wondering someone can provide a
> line or two of what sublinks are suppose to do?

They're sub-SELECTs used in expression contexts (ie, not directly in a
FROM list).  The comments for the SubLink and SubPlan node types in
primnodes.h may help you.

            regards, tom lane

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