Small code simplification

Apply GETSTRUCT() once instead of doing it repeatedly in the same
function.  This simplifies the notation and makes the function's
structure more similar to the surrounding ones.

Discussion: https://www.postgresql.org/message-id/flat/a368248e-69e4-40be-9c07-6c3b5880b0a6@eisentraut.org

diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 7a36db6af6d1ab97177d9fe3a9661524f6262f9f..dfba5f357b8450212538ed955db0c30fb3d34481 100644 (file)
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -7736,6 +7736,7 @@ ATExecSetNotNull(AlteredTableInfo *tab, Relation rel,
                                 const char *colName, LOCKMODE lockmode)
 {
        HeapTuple       tuple;
+       Form_pg_attribute attTup;
        AttrNumber      attnum;
        Relation        attr_rel;
        ObjectAddress address;
@@ -7753,7 +7754,8 @@ ATExecSetNotNull(AlteredTableInfo *tab, Relation rel,
                                 errmsg("column \"%s\" of relation \"%s\" does not exist",
                                                colName, RelationGetRelationName(rel))));
 
-       attnum = ((Form_pg_attribute) GETSTRUCT(tuple))->attnum;
+       attTup = (Form_pg_attribute) GETSTRUCT(tuple);
+       attnum = attTup->attnum;
 
        /* Prevent them from altering a system attribute */
        if (attnum <= 0)
@@ -7765,9 +7767,9 @@ ATExecSetNotNull(AlteredTableInfo *tab, Relation rel,
        /*
         * Okay, actually perform the catalog change ... if needed
         */
-       if (!((Form_pg_attribute) GETSTRUCT(tuple))->attnotnull)
+       if (!attTup->attnotnull)
        {
-               ((Form_pg_attribute) GETSTRUCT(tuple))->attnotnull = true;
+               attTup->attnotnull = true;
 
                CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);
 
@@ -7777,8 +7779,7 @@ ATExecSetNotNull(AlteredTableInfo *tab, Relation rel,
                 * this then we can skip that.  We needn't bother looking if we've
                 * already found that we must verify some other not-null constraint.
                 */
-               if (!tab->verify_new_notnull &&
-                       !NotNullImpliedByRelConstraints(rel, (Form_pg_attribute) GETSTRUCT(tuple)))
+               if (!tab->verify_new_notnull && !NotNullImpliedByRelConstraints(rel, attTup))
                {
                        /* Tell Phase 3 it needs to test the constraint */
                        tab->verify_new_notnull = true;