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Update obsolete comment.

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This commit is contained in:
Tom Lane 2006-02-19 19:59:53 +00:00
parent b34aa3372f
commit 21e2544aa7
1 changed files with 4 additions and 7 deletions
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11
src/backend/utils/sort/tuplesort.c
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@ -91,7 +91,7 @@
* Portions Copyright (c) 1994, Regents of the University of California * Portions Copyright (c) 1994, Regents of the University of California
* *
* IDENTIFICATION * IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/sort/tuplesort.c,v 1.58 2006/02/19 05:54:06 tgl Exp $ * $PostgreSQL: pgsql/src/backend/utils/sort/tuplesort.c,v 1.59 2006/02/19 19:59:53 tgl Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -324,8 +324,7 @@ struct Tuplesortstate
#define USEMEM(state,amt) ((state)->availMem -= (amt)) #define USEMEM(state,amt) ((state)->availMem -= (amt))
#define FREEMEM(state,amt) ((state)->availMem += (amt)) #define FREEMEM(state,amt) ((state)->availMem += (amt))
/*-------------------- /*
*
* NOTES about on-tape representation of tuples: * NOTES about on-tape representation of tuples:
* *
* We require the first "unsigned int" of a stored tuple to be the total size * We require the first "unsigned int" of a stored tuple to be the total size
@ -357,16 +356,13 @@ struct Tuplesortstate
* *
* We count space allocated for tuples against the workMem limit, plus * We count space allocated for tuples against the workMem limit, plus
* the space used by the variable-size arrays memtuples and memtupindex. * the space used by the variable-size arrays memtuples and memtupindex.
* Fixed-size space (primarily the LogicalTapeSet I/O buffers) is not * Fixed-size space is not counted; it's small enough to not be interesting.
* counted.
* *
* Note that we count actual space used (as shown by GetMemoryChunkSpace) * Note that we count actual space used (as shown by GetMemoryChunkSpace)
* rather than the originally-requested size. This is important since * rather than the originally-requested size. This is important since
* palloc can add substantial overhead. It's not a complete answer since * palloc can add substantial overhead. It's not a complete answer since
* we won't count any wasted space in palloc allocation blocks, but it's * we won't count any wasted space in palloc allocation blocks, but it's
* a lot better than what we were doing before 7.3. * a lot better than what we were doing before 7.3.
*
*--------------------
*/ */
/* /*
@ -2407,6 +2403,7 @@ readtup_datum(Tuplesortstate *state, int tapenum, unsigned int len)
sizeof(tuplen)) != sizeof(tuplen)) sizeof(tuplen)) != sizeof(tuplen))
elog(ERROR, "unexpected end of data"); elog(ERROR, "unexpected end of data");
/* if pass-by-ref data type, must recompute the Datum pointer */
if (!tuple->isNull && !state->datumTypeByVal) if (!tuple->isNull && !state->datumTypeByVal)
tuple->val = PointerGetDatum(((char *) tuple) + tuple->val = PointerGetDatum(((char *) tuple) +
MAXALIGN(sizeof(DatumTuple))); MAXALIGN(sizeof(DatumTuple)));