what is sublinks in query planner?

From: Sandeep Gupta <gupta(dot)sandeep(at)gmail(dot)com>
To: "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org>
Subject: what is sublinks in query planner?
Date: 2014-03-28 19:46:28
Message-ID: CAAywg7s55hLOJvHL=KgZEPYL1jusXMCRMuSSiyhvKezp8WZ1zg@mail.gmail.com
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Hi,

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?

Thanks.
Sandeep

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