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First cut at full support for OUTER JOINs. There are still a few loose

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ends to clean up (see my message of same date to pghackers), but mostly
it works.  INITDB REQUIRED!
This commit is contained in:
Tom Lane
2000-09-12 21:07:18 +00:00
parent b5c0ab278b
commit ed5003c584
93 changed files with 6386 additions and 4262 deletions
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43
src/backend/commands/view.c
View File

@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: view.c,v 1.47 2000/09/12 04:49:07 momjian Exp $
* $Id: view.c,v 1.48 2000/09/12 21:06:47 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -116,12 +116,14 @@ char *
MakeRetrieveViewRuleName(char *viewName)
{
char *buf;
#ifdef MULTIBYTE
int len;
#endif
buf = palloc(strlen(viewName) + 5);
snprintf(buf, strlen(viewName) + 5, "_RET%s", viewName);
#ifdef MULTIBYTE
int len;
len = pg_mbcliplen(buf,strlen(buf),NAMEDATALEN-1);
buf[len] = '\0';
#else
@ -203,6 +205,10 @@ DefineViewRules(char *viewName, Query *viewParse)
* Of course we must also increase the 'varnos' of all the Var nodes
* by 2...
*
* These extra RT entries are not actually used in the query, obviously.
* We add them so that views look the same as ON SELECT rules ---
* the rule rewriter assumes that ALL rules have OLD and NEW RTEs.
*
* NOTE: these are destructive changes. It would be difficult to
* make a complete copy of the parse tree and make the changes
* in the copy.
@ -211,43 +217,32 @@ DefineViewRules(char *viewName, Query *viewParse)
static void
UpdateRangeTableOfViewParse(char *viewName, Query *viewParse)
{
List *old_rt;
List *new_rt;
RangeTblEntry *rt_entry1,
*rt_entry2;
/*
* first offset all var nodes by 2
*/
OffsetVarNodes((Node *) viewParse->targetList, 2, 0);
OffsetVarNodes(viewParse->qual, 2, 0);
OffsetVarNodes(viewParse->havingQual, 2, 0);
/*
* find the old range table...
*/
old_rt = viewParse->rtable;
/*
* create the 2 new range table entries and form the new range
* table... OLD first, then NEW....
*/
rt_entry1 = addRangeTableEntry(NULL, (char *) viewName,
rt_entry1 = addRangeTableEntry(NULL, viewName,
makeAttr("*OLD*", NULL),
FALSE, FALSE, FALSE);
rt_entry2 = addRangeTableEntry(NULL, (char *) viewName,
false, false);
rt_entry2 = addRangeTableEntry(NULL, viewName,
makeAttr("*NEW*", NULL),
FALSE, FALSE, FALSE);
new_rt = lcons(rt_entry2, old_rt);
new_rt = lcons(rt_entry1, new_rt);
false, false);
new_rt = lcons(rt_entry1, lcons(rt_entry2, viewParse->rtable));
/*
* Now the tricky part.... Update the range table in place... Be
* careful here, or hell breaks loooooooooooooOOOOOOOOOOOOOOOOOOSE!
*/
viewParse->rtable = new_rt;
/*
* now offset all var nodes by 2, and jointree RT indexes too.
*/
OffsetVarNodes((Node *) viewParse, 2, 0);
}
/*-------------------------------------------------------------------
@ -270,7 +265,7 @@ DefineView(char *viewName, Query *viewParse)
viewTlist = viewParse->targetList;
/*
* Create the "view" relation NOTE: if it already exists, the xaxt
* Create the "view" relation NOTE: if it already exists, the xact
* will be aborted.
*/
DefineVirtualRelation(viewName, viewTlist);