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,

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 ) */

/*

* ALTER TABLE ALTER COLUMN SET STATISTICS

*

* Return value is the address of the modified column

*/

staticvoid

ATPrepSetStatistics(Relation rel, const char *colName, int16 colNum, Node *newValue, LOCKMODE lockmode)

staticObjectAddress

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))));

intnewtarget;

Relationattrelation;

HeapTupletuple;

Form_pg_attribute attrtuple;

AttrNumberattnum;

ObjectAddress address;

/*

* We allow referencing columns by numbers only for indexes, since table

(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)

{

intnewtarget;

Relationattrelation;

HeapTupletuple;

Form_pg_attribute attrtuple;

AttrNumberattnum;

ObjectAddress address;

Assert(IsA(newValue, Integer));

newtarget = intVal(newValue);