What's the purpose of mark/restrpos in heapam.c?

AFAIK, mark/restore is only used by merge joins, and you can't feed a merge join from a heap scan because merge join requires sorted input.

Unless I'm missing something, heap_markpos and heap_restrpos are dead code.

 Heikki Linnakangas
 EnterpriseDB   http://www.enterprisedb.com

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      choose an index scan if your joining column's datatypes do not

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