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Here is the definition of relation_byte_size() in optimizer/path/costsize.c:

----------------------------------------------------------------------/* * relation_byte_size * Estimate the storage space in bytes for a given number of tuples * of a given width (size in bytes). */static doublerelation_byte_size(double tuples, int width){ return tuples * (MAXALIGN(width) + MAXALIGN(sizeof(HeapTupleData)));}----------------------------------------------------------------------Shouldn't this be HeapTupleHeaderData and not HeapTupleData ?(Of course, from a costing perspective these shouldn't be very different but ...)Sailesh Krishnamurthy

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src/backend/optimizer/path
- costsize.c

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`‎src/backend/optimizer/path/costsize.c‎`

Lines changed: 2 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -49,7 +49,7 @@`
`49`	`49`	`* Portions Copyright (c) 1994, Regents of the University of California`
`50`	`50`	`*`
`51`	`51`	`* IDENTIFICATION`
`52`		`- * $PostgreSQL: pgsql/src/backend/optimizer/path/costsize.c,v 1.117 2003/12/03 17:45:07 tgl Exp $`
	`52`	`+ * $PostgreSQL: pgsql/src/backend/optimizer/path/costsize.c,v 1.118 2003/12/18 03:46:45 momjian Exp $`
`53`	`53`	`*`
`54`	`54`	`*-------------------------------------------------------------------------`
`55`	`55`	`*/`
`@@ -1969,7 +1969,7 @@ set_rel_width(Query root, RelOptInfo rel)`
`1969`	`1969`	`staticdouble`
`1970`	`1970`	`relation_byte_size(doubletuples,intwidth)`
`1971`	`1971`	`{`
`1972`		`-returntuples* (MAXALIGN(width)+MAXALIGN(sizeof(HeapTupleData)));`
	`1972`	`+returntuples* (MAXALIGN(width)+MAXALIGN(sizeof(HeapTupleHeaderData)));`
`1973`	`1973`	`}`
`1974`	`1974`
`1975`	`1975`	`/*`

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Commited96bfd

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`‎src/backend/optimizer/path/costsize.c‎`

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