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Make DROP TABLE rollback-able: postpone physical file delete until commit.

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(WAL logging for this is not done yet, however.)  Clean up a number of really
crufty things that are no longer needed now that DROP behaves nicely.  Make
temp table mapper do the right things when drop or rename affecting a temp
table is rolled back.  Also, remove "relation modified while in use" error
check, in favor of locking tables at first reference and holding that lock
throughout the statement.
This commit is contained in:
Tom Lane
2000-11-08 22:10:03 +00:00
parent ebe0b23690
commit 3908473c80
46 changed files with 1305 additions and 1187 deletions
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55
src/backend/access/common/tupdesc.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/common/tupdesc.c,v 1.67 2000/10/05 19:48:20 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/access/common/tupdesc.c,v 1.68 2000/11/08 22:09:53 tgl Exp $
*
* NOTES
* some of the executor utility code such as "ExecTypeFromTL" should be
@@ -228,7 +228,9 @@ FreeTupleDesc(TupleDesc tupdesc)
bool
equalTupleDescs(TupleDesc tupdesc1, TupleDesc tupdesc2)
{
int i;
int i,
j,
n;
if (tupdesc1->natts != tupdesc2->natts)
return false;
@@ -240,7 +242,9 @@ equalTupleDescs(TupleDesc tupdesc1, TupleDesc tupdesc2)
/*
* We do not need to check every single field here, and in fact
* some fields such as attdispersion probably shouldn't be
* compared.
* compared. We can also disregard attnum (it was used to
* place the row in the attrs array) and everything derived
* from the column datatype.
*/
if (strcmp(NameStr(attr1->attname), NameStr(attr2->attname)) != 0)
return false;
@@ -260,32 +264,53 @@ equalTupleDescs(TupleDesc tupdesc1, TupleDesc tupdesc2)
if (constr2 == NULL)
return false;
if (constr1->num_defval != constr2->num_defval)
if (constr1->has_not_null != constr2->has_not_null)
return false;
for (i = 0; i < (int) constr1->num_defval; i++)
n = constr1->num_defval;
if (n != (int) constr2->num_defval)
return false;
for (i = 0; i < n; i++)
{
AttrDefault *defval1 = constr1->defval + i;
AttrDefault *defval2 = constr2->defval + i;
AttrDefault *defval2 = constr2->defval;
if (defval1->adnum != defval2->adnum)
/*
* We can't assume that the items are always read from the
* system catalogs in the same order; so use the adnum field to
* identify the matching item to compare.
*/
for (j = 0; j < n; defval2++, j++)
{
if (defval1->adnum == defval2->adnum)
break;
}
if (j >= n)
return false;
if (strcmp(defval1->adbin, defval2->adbin) != 0)
return false;
}
if (constr1->num_check != constr2->num_check)
n = constr1->num_check;
if (n != (int) constr2->num_check)
return false;
for (i = 0; i < (int) constr1->num_check; i++)
for (i = 0; i < n; i++)
{
ConstrCheck *check1 = constr1->check + i;
ConstrCheck *check2 = constr2->check + i;
ConstrCheck *check2 = constr2->check;
if (strcmp(check1->ccname, check2->ccname) != 0)
return false;
if (strcmp(check1->ccbin, check2->ccbin) != 0)
/*
* Similarly, don't assume that the checks are always read
* in the same order; match them up by name and contents.
* (The name *should* be unique, but...)
*/
for (j = 0; j < n; check2++, j++)
{
if (strcmp(check1->ccname, check2->ccname) == 0 &&
strcmp(check1->ccbin, check2->ccbin) == 0)
break;
}
if (j >= n)
return false;
}
if (constr1->has_not_null != constr2->has_not_null)
return false;
}
else if (tupdesc2->constr != NULL)
return false;