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I checked the alter table code, and started suspecting the relation 

cache.  I found if I manually added a line to flush the whole relation
cache, the assert error disappeared.  Looking through the code, I found
that the relation cache is flushed at the end of each query if the
reference count is zero for the relation.  However, printf's showed that
the rd_relcnt(reference count) for the accessed query was not returning
to zero after each query.

It turns out the parser was doing a heap_ropen in parser/analyze.c to
get information about the table's columns, but was not doing a
heap_close.

This was causing the query after the ALTER TABLE ADD to see the old
table structure, and the executor's assert was reporting the problem.
This commit is contained in:
Bruce Momjian 1996-10-13 04:26:39 +00:00
parent bef3c89a1c
commit abb1b3e770
3 changed files with 17 additions and 11 deletions
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7
src/Makefile.global
View File

@ -7,7 +7,7 @@
#
#
# IDENTIFICATION
# $Header: /cvsroot/pgsql/src/Attic/Makefile.global,v 1.37 1996/10/11 02:38:16 scrappy Exp $
# $Header: /cvsroot/pgsql/src/Attic/Makefile.global,v 1.38 1996/10/13 04:25:23 momjian Exp $
#
# NOTES
# This is seen by any Makefiles that include mk/postgres.mk. To
@ -214,7 +214,10 @@ X11_INCDIR = /usr/include
X11_LIBDIR = /usr/lib
X11_LIB = -lX11 -lsocket -lnsl
#
# These must match include/config.h
NAMEDATALEN= 32
OIDNAMELEN= 36
# include port specific rules and variables. For instance:
#
# signal(2) handling - this is here because it affects some of

17
src/backend/parser/analyze.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.5 1996/08/06 16:37:58 scrappy Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.6 1996/10/13 04:25:42 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -95,10 +95,11 @@ makeParseState() {
pstate = malloc(sizeof(ParseState));
pstate->p_last_resno = 1;
pstate->p_target_resnos = NIL;
pstate->p_current_rel = NULL;
pstate->p_rtable = NIL;
pstate->p_query_is_rule = 0;
pstate->p_numAgg = 0;
pstate->p_aggs = NULL;
pstate->p_aggs = NIL;
return (pstate);
}
@ -126,6 +127,8 @@ parse_analyze(List *pl)
pstate = makeParseState();
result->qtrees[i++] = transformStmt(pstate, lfirst(pl));
pl = lnext(pl);
if (pstate->p_current_rel != NULL)
heap_close(pstate->p_current_rel);
free(pstate);
}
@ -828,8 +831,8 @@ makeRangeTable(ParseState *pstate, char *relname, List *frmList)
pstate->p_rtable = lappend(pstate->p_rtable, ent);
}
x = RangeTablePosn(pstate->p_rtable, relname);
pstate->parser_current_rel = heap_openr(VarnoGetRelname(pstate,x));
if (pstate->parser_current_rel == NULL)
pstate->p_current_rel = heap_openr(VarnoGetRelname(pstate,x));
if (pstate->p_current_rel == NULL)
elog(WARN,"invalid relation name");
}
@ -1036,7 +1039,7 @@ makeTargetList(ParseState *pstate, List *cols, List *exprs)
exprs = lnext(exprs);
}
} else {
Relation insertRel = pstate->parser_current_rel;
Relation insertRel = pstate->p_current_rel;
int numcol;
int i;
AttributeTupleForm *attr = insertRel->rd_att->attrs;
@ -1155,7 +1158,7 @@ transformTargetList(ParseState *pstate,
i++;
}
sprintf(str, "=%s", val);
rd = pstate->parser_current_rel;
rd = pstate->p_current_rel;
Assert(rd != NULL);
resdomno = varattno(rd, res->name);
ndims = att_attnelems(rd, resdomno);
@ -1334,7 +1337,7 @@ make_targetlist_expr(ParseState *pstate,
* append, replace work only on one relation,
* so multiple occurence of same resdomno is bogus
*/
rd = pstate->parser_current_rel;
rd = pstate->p_current_rel;
Assert(rd != NULL);
resdomno = varattno(rd,name);
attrisset = varisset(rd,name);

4
src/include/parser/parse_state.h
View File

@ -4,7 +4,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: parse_state.h,v 1.1 1996/08/28 07:23:56 scrappy Exp $
* $Id: parse_state.h,v 1.2 1996/10/13 04:26:39 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -16,7 +16,7 @@
typedef struct ParseState {
int p_last_resno;
List *p_target_resnos;
Relation parser_current_rel;
Relation p_parser_current_rel;
List *p_rtable;
int p_query_is_rule;
int p_numAgg;