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The cstring datatype can now be copied, passed around, etc. The typlen

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value '-2' is used to indicate a variable-width type whose width is
computed as strlen(datum)+1.  Everything that looks at typlen is updated
except for array support, which Joe Conway is working on; at the moment
it wouldn't work to try to create an array of cstring.
This commit is contained in:
Tom Lane
2002-08-24 15:00:47 +00:00
parent cf4d885c67
commit 976246cc7e
23 changed files with 260 additions and 198 deletions
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17
src/backend/nodes/copyfuncs.c
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@ -15,7 +15,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.204 2002/08/19 15:08:46 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.205 2002/08/24 15:00:46 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -24,6 +24,7 @@
#include "optimizer/clauses.h"
#include "optimizer/planmain.h"
#include "utils/datum.h"
/*
@ -791,23 +792,17 @@ _copyConst(Const *from)
/*
* passed by value so just copy the datum. Also, don't try to copy
* struct when value is null!
*
*/
newnode->constvalue = from->constvalue;
}
else
{
/*
* not passed by value. datum contains a pointer.
* not passed by value. We need a palloc'd copy.
*/
int length = from->constlen;
if (length == -1) /* variable-length type? */
length = VARSIZE(from->constvalue);
newnode->constvalue = PointerGetDatum(palloc(length));
memcpy(DatumGetPointer(newnode->constvalue),
DatumGetPointer(from->constvalue),
length);
newnode->constvalue = datumCopy(from->constvalue,
from->constbyval,
from->constlen);
}
newnode->constisnull = from->constisnull;