diff options
Diffstat (limited to 'src/include/access/htup.h')
| -rw-r--r-- | src/include/access/htup.h | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/src/include/access/htup.h b/src/include/access/htup.h index f6fbd8f04a3..3a10fa34fd1 100644 --- a/src/include/access/htup.h +++ b/src/include/access/htup.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/access/htup.h,v 1.78 2005/10/15 02:49:42 momjian Exp $ + * $PostgreSQL: pgsql/src/include/access/htup.h,v 1.79 2005/11/20 19:49:08 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -361,20 +361,20 @@ do { \ * * * Pointer to a tuple in a disk buffer: t_data points directly into the * buffer (which the code had better be holding a pin on, but this is not - * reflected in HeapTupleData itself). t_datamcxt must be NULL. + * reflected in HeapTupleData itself). * - * * Pointer to nothing: t_data and t_datamcxt are NULL. This is used as - * a failure indication in some functions. + * * Pointer to nothing: t_data is NULL. This is used as a failure indication + * in some functions. * * * Part of a palloc'd tuple: the HeapTupleData itself and the tuple * form a single palloc'd chunk. t_data points to the memory location - * immediately following the HeapTupleData struct (at offset HEAPTUPLESIZE), - * and t_datamcxt is the containing context. This is used as the output - * format of heap_form_tuple and related routines. + * immediately following the HeapTupleData struct (at offset HEAPTUPLESIZE). + * This is the output format of heap_form_tuple and related routines. * * * Separately allocated tuple: t_data points to a palloc'd chunk that - * is not adjacent to the HeapTupleData, and t_datamcxt is the context - * containing that chunk. + * is not adjacent to the HeapTupleData. (This case is deprecated since + * it's difficult to tell apart from case #1. It should be used only in + * limited contexts where the code knows that case #1 will never apply.) * * t_len should always be valid, except in the pointer-to-nothing case. * t_self and t_tableOid should be valid if the HeapTupleData points to @@ -386,7 +386,6 @@ typedef struct HeapTupleData uint32 t_len; /* length of *t_data */ ItemPointerData t_self; /* SelfItemPointer */ Oid t_tableOid; /* table the tuple came from */ - MemoryContext t_datamcxt; /* memory context of allocation */ HeapTupleHeader t_data; /* -> tuple header and data */ } HeapTupleData; |