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-rw-r--r--src/backend/parser/analyze.c136
1 files changed, 20 insertions, 116 deletions
diff --git a/src/backend/parser/analyze.c b/src/backend/parser/analyze.c
index f6cdf96e296..e5537e26ae9 100644
--- a/src/backend/parser/analyze.c
+++ b/src/backend/parser/analyze.c
@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/backend/parser/analyze.c,v 1.304 2004/06/09 19:08:16 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/parser/analyze.c,v 1.305 2004/06/10 17:55:58 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -20,6 +20,7 @@
#include "catalog/namespace.h"
#include "catalog/pg_index.h"
#include "catalog/pg_type.h"
+#include "commands/defrem.h"
#include "commands/prepare.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
@@ -45,7 +46,6 @@
#include "utils/lsyscache.h"
#include "utils/relcache.h"
#include "utils/syscache.h"
-#include "mb/pg_wchar.h"
/* State shared by transformCreateSchemaStmt and its subroutines */
@@ -704,90 +704,6 @@ transformInsertStmt(ParseState *pstate, InsertStmt *stmt,
}
/*
- * makeObjectName()
- *
- * Create a name for an implicitly created index, sequence, constraint, etc.
- *
- * The parameters are: the original table name, the original field name, and
- * a "type" string (such as "seq" or "pkey"). The field name and/or type
- * can be NULL if not relevant.
- *
- * The result is a palloc'd string.
- *
- * The basic result we want is "name1_name2_type", omitting "_name2" or
- * "_type" when those parameters are NULL. However, we must generate
- * a name with less than NAMEDATALEN characters! So, we truncate one or
- * both names if necessary to make a short-enough string. The type part
- * is never truncated (so it had better be reasonably short).
- *
- * To reduce the probability of collisions, we might someday add more
- * smarts to this routine, like including some "hash" characters computed
- * from the truncated characters. Currently it seems best to keep it simple,
- * so that the generated names are easily predictable by a person.
- */
-char *
-makeObjectName(const char *name1, const char *name2, const char *typename)
-{
- char *name;
- int overhead = 0; /* chars needed for type and underscores */
- int availchars; /* chars available for name(s) */
- int name1chars; /* chars allocated to name1 */
- int name2chars; /* chars allocated to name2 */
- int ndx;
-
- name1chars = strlen(name1);
- if (name2)
- {
- name2chars = strlen(name2);
- overhead++; /* allow for separating underscore */
- }
- else
- name2chars = 0;
- if (typename)
- overhead += strlen(typename) + 1;
-
- availchars = NAMEDATALEN - 1 - overhead;
-
- /*
- * If we must truncate, preferentially truncate the longer name. This
- * logic could be expressed without a loop, but it's simple and
- * obvious as a loop.
- */
- while (name1chars + name2chars > availchars)
- {
- if (name1chars > name2chars)
- name1chars--;
- else
- name2chars--;
- }
-
- if (name1)
- name1chars = pg_mbcliplen(name1, name1chars, name1chars);
- if (name2)
- name2chars = pg_mbcliplen(name2, name2chars, name2chars);
-
- /* Now construct the string using the chosen lengths */
- name = palloc(name1chars + name2chars + overhead + 1);
- strncpy(name, name1, name1chars);
- ndx = name1chars;
- if (name2)
- {
- name[ndx++] = '_';
- strncpy(name + ndx, name2, name2chars);
- ndx += name2chars;
- }
- if (typename)
- {
- name[ndx++] = '_';
- strcpy(name + ndx, typename);
- }
- else
- name[ndx] = '\0';
-
- return name;
-}
-
-/*
* transformCreateStmt -
* transforms the "create table" statement
* SQL92 allows constraints to be scattered all over, so thumb through
@@ -919,21 +835,34 @@ transformColumnDefinition(ParseState *pstate, CreateStmtContext *cxt,
/* Special actions for SERIAL pseudo-types */
if (is_serial)
{
- char *sname;
+ Oid snamespaceid;
char *snamespace;
+ char *sname;
char *qstring;
A_Const *snamenode;
FuncCall *funccallnode;
CreateSeqStmt *seqstmt;
/*
- * Determine name and namespace to use for the sequence.
+ * Determine namespace and name to use for the sequence.
+ *
+ * Although we use ChooseRelationName, it's not guaranteed that
+ * the selected sequence name won't conflict; given sufficiently
+ * long field names, two different serial columns in the same table
+ * could be assigned the same sequence name, and we'd not notice
+ * since we aren't creating the sequence quite yet. In practice
+ * this seems quite unlikely to be a problem, especially since
+ * few people would need two serial columns in one table.
*/
- sname = makeObjectName(cxt->relation->relname, column->colname, "seq");
- snamespace = get_namespace_name(RangeVarGetCreationNamespace(cxt->relation));
+ snamespaceid = RangeVarGetCreationNamespace(cxt->relation);
+ snamespace = get_namespace_name(snamespaceid);
+ sname = ChooseRelationName(cxt->relation->relname,
+ column->colname,
+ "seq",
+ snamespaceid);
ereport(NOTICE,
- (errmsg("%s will create implicit sequence \"%s\" for \"serial\" column \"%s.%s\"",
+ (errmsg("%s will create implicit sequence \"%s\" for serial column \"%s.%s\"",
cxt->stmtType, sname,
cxt->relation->relname, column->colname)));
@@ -975,7 +904,6 @@ transformColumnDefinition(ParseState *pstate, CreateStmtContext *cxt,
constraint = makeNode(Constraint);
constraint->contype = CONSTR_DEFAULT;
- constraint->name = sname;
constraint->raw_expr = (Node *) funccallnode;
constraint->cooked_expr = NULL;
constraint->keys = NIL;
@@ -1044,30 +972,13 @@ transformColumnDefinition(ParseState *pstate, CreateStmtContext *cxt,
break;
case CONSTR_PRIMARY:
- if (constraint->name == NULL)
- constraint->name = makeObjectName(cxt->relation->relname,
- NULL,
- "pkey");
- if (constraint->keys == NIL)
- constraint->keys = list_make1(makeString(column->colname));
- cxt->ixconstraints = lappend(cxt->ixconstraints, constraint);
- break;
-
case CONSTR_UNIQUE:
- if (constraint->name == NULL)
- constraint->name = makeObjectName(cxt->relation->relname,
- column->colname,
- "key");
if (constraint->keys == NIL)
constraint->keys = list_make1(makeString(column->colname));
cxt->ixconstraints = lappend(cxt->ixconstraints, constraint);
break;
case CONSTR_CHECK:
- if (constraint->name == NULL)
- constraint->name = makeObjectName(cxt->relation->relname,
- column->colname,
- NULL);
cxt->ckconstraints = lappend(cxt->ckconstraints, constraint);
break;
@@ -1093,13 +1004,6 @@ transformTableConstraint(ParseState *pstate, CreateStmtContext *cxt,
switch (constraint->contype)
{
case CONSTR_PRIMARY:
- if (constraint->name == NULL)
- constraint->name = makeObjectName(cxt->relation->relname,
- NULL,
- "pkey");
- cxt->ixconstraints = lappend(cxt->ixconstraints, constraint);
- break;
-
case CONSTR_UNIQUE:
cxt->ixconstraints = lappend(cxt->ixconstraints, constraint);
break;
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-29 03:24:39 +0000