Function ProcessSubqueryToJoin

src/backend/cdb/cdbsubselect.c:218–226

* Process subquery to extract useful information to be able to convert it to * a join. * * This scans the join tree, and verifies that it consists entirely of inner * joins. The inner joins can be represented as explicit JOIN_INNER JoinExprs* * or as FromExprs. All the join quals are collected in context->innerQual. * * context->safeToConvert must be 'true' on entry. This sets it to false i

 * there are any non-inner joins in the tree.
 */
static void
ProcessSubqueryToJoin(Query *subselect, ConvertSubqueryToJoinContext *context)
{
	Assert(context);
	Assert(context->safeToConvert);
	Assert(subselect);

	ProcessSubqueryToJoin_walker((Node *) subselect->jointree, context);
}

static void
ProcessSubqueryToJoin_walker(Node *jtree, ConvertSubqueryToJoinContext *context)