What are ExecSeqMarkPos and ExecSeqRestrPos used for

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Тема What are ExecSeqMarkPos and ExecSeqRestrPos used for
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Msg-id BAY173-W89E4F14C21AD061FEDDF1E6970@phx.gbl
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Ответы Re: What are ExecSeqMarkPos and ExecSeqRestrPos used for
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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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