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Remove ATPrepSetStatistics
2019年12月11日 07:59:18 +0000 (08:59 +0100)
2019年12月11日 08:04:04 +0000 (09:04 +0100)
It was once possible to do ALTER TABLE ... SET STATISTICS on system
tables without allow_sytem_table_mods. This was changed apparently by
accident between PostgreSQL 9.1 and 9.2, but a code comment still
claimed this was possible. Without that functionality, having a
separate ATPrepSetStatistics() is useless, so use the generic
ATSimplePermissions() instead and move the remaining custom code into
ATExecSetStatistics().

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/cc8d2648-a0ec-7a86-13e5-db473484e19e%402ndquadrant.com


diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5440eb90153d10b5081408194d19988df3a66b16..daa80ec4aa0bee57abbf444935146e1f9f13c86f 100644 (file)
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -386,8 +386,6 @@ static ObjectAddress ATExecAddIdentity(Relation rel, const char *colName,
static ObjectAddress ATExecSetIdentity(Relation rel, const char *colName,
Node *def, LOCKMODE lockmode);
static ObjectAddress ATExecDropIdentity(Relation rel, const char *colName, bool missing_ok, LOCKMODE lockmode);
-static void ATPrepSetStatistics(Relation rel, const char *colName, int16 colNum,
- Node *newValue, LOCKMODE lockmode);
static ObjectAddress ATExecSetStatistics(Relation rel, const char *colName, int16 colNum,
Node *newValue, LOCKMODE lockmode);
static ObjectAddress ATExecSetOptions(Relation rel, const char *colName,
@@ -3948,9 +3946,9 @@ ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
pass = AT_PASS_COL_ATTRS;
break;
case AT_SetStatistics: /* ALTER COLUMN SET STATISTICS */
+ ATSimplePermissions(rel, ATT_TABLE | ATT_MATVIEW | ATT_INDEX | ATT_PARTITIONED_INDEX | ATT_FOREIGN_TABLE);
ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode);
- /* Performs own permission checks */
- ATPrepSetStatistics(rel, cmd->name, cmd->num, cmd->def, lockmode);
+ /* No command-specific prep needed */
pass = AT_PASS_MISC;
break;
case AT_SetOptions: /* ALTER COLUMN SET ( options ) */
@@ -6702,26 +6700,18 @@ ATExecDropIdentity(Relation rel, const char *colName, bool missing_ok, LOCKMODE
/*
* ALTER TABLE ALTER COLUMN SET STATISTICS
+ *
+ * Return value is the address of the modified column
*/
-static void
-ATPrepSetStatistics(Relation rel, const char *colName, int16 colNum, Node *newValue, LOCKMODE lockmode)
+static ObjectAddress
+ATExecSetStatistics(Relation rel, const char *colName, int16 colNum, Node *newValue, LOCKMODE lockmode)
{
- /*
- * We do our own permission checking because (a) we want to allow SET
- * STATISTICS on indexes (for expressional index columns), and (b) we want
- * to allow SET STATISTICS on system catalogs without requiring
- * allowSystemTableMods to be turned on.
- */
- if (rel->rd_rel->relkind != RELKIND_RELATION &&
- rel->rd_rel->relkind != RELKIND_MATVIEW &&
- rel->rd_rel->relkind != RELKIND_INDEX &&
- rel->rd_rel->relkind != RELKIND_PARTITIONED_INDEX &&
- rel->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&
- rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
- ereport(ERROR,
- (errcode(ERRCODE_WRONG_OBJECT_TYPE),
- errmsg("\"%s\" is not a table, materialized view, index, or foreign table",
- RelationGetRelationName(rel))));
+ int newtarget;
+ Relation attrelation;
+ HeapTuple tuple;
+ Form_pg_attribute attrtuple;
+ AttrNumber attnum;
+ ObjectAddress address;
/*
* We allow referencing columns by numbers only for indexes, since table
@@ -6734,25 +6724,6 @@ ATPrepSetStatistics(Relation rel, const char *colName, int16 colNum, Node *newVa
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot refer to non-index column by number")));
- /* Permissions checks */
- if (!pg_class_ownercheck(RelationGetRelid(rel), GetUserId()))
- aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(rel->rd_rel->relkind),
- RelationGetRelationName(rel));
-}
-
-/*
- * Return value is the address of the modified column
- */
-static ObjectAddress
-ATExecSetStatistics(Relation rel, const char *colName, int16 colNum, Node *newValue, LOCKMODE lockmode)
-{
- int newtarget;
- Relation attrelation;
- HeapTuple tuple;
- Form_pg_attribute attrtuple;
- AttrNumber attnum;
- ObjectAddress address;
-
Assert(IsA(newValue, Integer));
newtarget = intVal(newValue);
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