OidFunctionCall7 is called from costsize.c, in function void cost_index. From
the comments, I understand that there is an indirection mechanism here to
allow for different index access methods. Looking at fmgr.h where it is
declared is not clear to me where I would ultimately find the code.
Any pointers will be greatly appreciated
/*
* Call index-access-method-specific code to estimate the processing
cost
* for scanning the index, as well as the selectivity of the index (ie,
* the fraction of main-table tuples we will have to retrieve) and its
* correlation to the main-table tuple order.
*/
OidFunctionCall7(index->amcostestimate,
PointerGetDatum(root),
PointerGetDatum(path),
Float8GetDatum(loop_count),
PointerGetDatum(&indexStartupCost),
PointerGetDatum(&indexTotalCost),
PointerGetDatum(&indexSelectivity),
PointerGetDatum(&indexCorrelation));
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