typedef HeapScanDescData *HeapScanDesc ;
typedef struct HeapScanDescData
{
Relation rs_rd;
Snapshot rs_snapshot;
int rs_nkeys;
ScanKey rs_key;
...
PageNumber rs_npages;
PageNumber rs_startpage;
...
HeapTupleData rs_ctup;
PageNumber rs_cpage;
Buffer rs_cbuf;
...
} HeapScanDescData;
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