What are ExecSeqMarkPos and ExecSeqRestrPos used for

From: DT <kurt023(at)hotmail(dot)com>
To: "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org>
Subject: What are ExecSeqMarkPos and ExecSeqRestrPos used for
Date: 2013-05-28 10:11:03
Message-ID: BAY173-W89E4F14C21AD061FEDDF1E6970@phx.gbl
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Hi,

I'm reading code of nodeSeqscan, and was confused with ExecSeqMarkPos and
ExecSeqRestrPos. They are only called by ExecMergeJoin. Could merge join use
a plain seqscan as outer/inner plan? If not, what are they used for?

Thanks.

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