foreach(lc, restrictinfolist)
{
List *targetcolumns;
RestrictInfo *node = (RestrictInfo *) lfirst(lc);
targetcolumns = pull_var_clause((Node *) node->clause,
PVC_RECURSE_AGGREGATES,
PVC_RECURSE_PLACEHOLDERS);
columns = list_union(columns, targetcolumns);
}
/*
* build_base_rel_tlists
* Add targetlist entries for each var needed in the query's final tlist
* to the appropriate base relations.
*
* We mark such vars as needed by "relation 0" to ensure that they will
* propagate up through all join plan steps.
*/
void
build_base_rel_tlists(PlannerInfo *root, List *final_tlist)
{
List *tlist_vars = pull_var_clause((Node *) final_tlist,
PVC_INCLUDE_PLACEHOLDERS);
if (tlist_vars != NIL)
{
add_vars_to_targetlist(root, tlist_vars, bms_make_singleton(0));
list_free(tlist_vars);
}
}
/*
* initialize_rel_nodes--
* Creates rel nodes for every relation mentioned in the target list
* 'tlist' (if a node hasn't already been created) and adds them to
* *query-relation-list*. Creates targetlist entries for each member of
* 'tlist' and adds them to the tlist field of the appropriate rel node.
*
* Returns nothing.
*/
void
initialize_base_rels_list(Query *root, List *tlist)
{
List *tlist_vars = NIL;
List *l = NIL;
List *tvar = NIL;
foreach (l, tlist) {
TargetEntry *entry = (TargetEntry *) lfirst(l);
tlist_vars = append(tlist_vars, pull_var_clause(entry->expr));
}
/*
* The list of needed columns (represented by their respective vars)
* is pulled from:
* - the targetcolumns
* - the restrictinfo
*/
List *
extractColumns(List *reltargetlist, List *restrictinfolist)
{
ListCell *lc;
List *columns = NULL;
int i = 0;
foreach(lc, reltargetlist)
{
List *targetcolumns;
Node *node = (Node *) lfirst(lc);
targetcolumns = pull_var_clause(node,
PVC_RECURSE_AGGREGATES,
PVC_RECURSE_PLACEHOLDERS);
columns = list_union(columns, targetcolumns);
i++;
}
