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Subselects in FROM clause, per ISO syntax: FROM (SELECT ...) [AS] alias.

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(Don't forget that an alias is required.)  Views reimplemented as expanding
to subselect-in-FROM.  Grouping, aggregates, DISTINCT in views actually
work now (he says optimistically).  No UNION support in subselects/views
yet, but I have some ideas about that.  Rule-related permissions checking
moved out of rewriter and into executor.
INITDB REQUIRED!
This commit is contained in:
Tom Lane
2000-09-29 18:21:41 +00:00
parent 6f64c2e54a
commit 3a94e789f5
77 changed files with 3176 additions and 2661 deletions
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67
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 1.48 2000/09/12 21:06:47 tgl Exp $
* $Id: view.c,v 1.49 2000/09/29 18:21:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -39,70 +39,60 @@
static void
DefineVirtualRelation(char *relname, List *tlist)
{
CreateStmt createStmt;
CreateStmt *createStmt = makeNode(CreateStmt);
List *attrList,
*t;
TargetEntry *entry;
Resdom *res;
char *resname;
char *restypename;
/*
* create a list with one entry per attribute of this relation. Each
* entry is a two element list. The first element is the name of the
* attribute (a string) and the second the name of the type (NOTE: a
* string, not a type id!).
* create a list of ColumnDef nodes based on the names and types of
* the (non-junk) targetlist items from the view's SELECT list.
*/
attrList = NIL;
if (tlist != NIL)
foreach(t, tlist)
{
foreach(t, tlist)
TargetEntry *entry = lfirst(t);
Resdom *res = entry->resdom;
if (! res->resjunk)
{
char *resname = res->resname;
char *restypename = typeidTypeName(res->restype);
ColumnDef *def = makeNode(ColumnDef);
TypeName *typename;
/*
* find the names of the attribute & its type
*/
entry = lfirst(t);
res = entry->resdom;
resname = res->resname;
restypename = typeidTypeName(res->restype);
typename = makeNode(TypeName);
typename->name = pstrdup(restypename);
typename->typmod = res->restypmod;
TypeName *typename = makeNode(TypeName);
def->colname = pstrdup(resname);
typename->name = pstrdup(restypename);
typename->typmod = res->restypmod;
def->typename = typename;
def->is_not_null = false;
def->is_sequence = false;
def->raw_default = NULL;
def->cooked_default = NULL;
def->constraints = NIL;
attrList = lappend(attrList, def);
}
}
else
if (attrList == NIL)
elog(ERROR, "attempted to define virtual relation with no attrs");
/*
* now create the parametesr for keys/inheritance etc. All of them are
* now create the parameters for keys/inheritance etc. All of them are
* nil...
*/
createStmt.relname = relname;
createStmt.istemp = false;
createStmt.tableElts = attrList;
/* createStmt.tableType = NULL;*/
createStmt.inhRelnames = NIL;
createStmt.constraints = NIL;
createStmt->relname = relname;
createStmt->istemp = false;
createStmt->tableElts = attrList;
createStmt->inhRelnames = NIL;
createStmt->constraints = NIL;
/*
* finally create the relation...
*/
DefineRelation(&createStmt, RELKIND_VIEW);
DefineRelation(createStmt, RELKIND_VIEW);
}
/*------------------------------------------------------------------
@ -149,13 +139,12 @@ FormViewRetrieveRule(char *viewName, Query *viewParse)
attr = makeNode(Attr);
attr->relname = pstrdup(viewName);
/* attr->refname = pstrdup(viewName);*/
rule->rulename = pstrdup(rname);
rule->whereClause = NULL;
rule->event = CMD_SELECT;
rule->object = attr;
rule->instead = true;
rule->actions = lcons(viewParse, NIL);
rule->actions = makeList1(viewParse);
return rule;
}
@ -231,6 +220,10 @@ UpdateRangeTableOfViewParse(char *viewName, Query *viewParse)
rt_entry2 = addRangeTableEntry(NULL, viewName,
makeAttr("*NEW*", NULL),
false, false);
/* Must override addRangeTableEntry's default access-check flags */
rt_entry1->checkForRead = false;
rt_entry2->checkForRead = false;
new_rt = lcons(rt_entry1, lcons(rt_entry2, viewParse->rtable));
/*