Compat for PG 14,15

src/pgduckdb_background_worker.cpp

@@ -17,6 +17,8 @@
 #include "pgduckdb/utility/cpp_wrapper.hpp"
 #include <string>
 #include <unordered_map>
+#include <sys/file.h>
+#include <fcntl.h>
 
 extern "C" {
 #include "postgres.h"
@@ -138,8 +140,12 @@ bool
 HasBgwRunningForMyDatabase() {
 	const auto num_backends = pgstat_fetch_stat_numbackends();
 	for (int backend_idx = 1; backend_idx <= num_backends; ++backend_idx) {
+#if PG_VERSION_NUM >= 140000 && PG_VERSION_NUM < 160000
+		PgBackendStatus *beentry = pgstat_fetch_stat_beentry(backend_idx);
+#else
 		LocalPgBackendStatus *local_beentry = pgstat_get_local_beentry_by_index(backend_idx);
 		PgBackendStatus *beentry = &local_beentry->backendStatus;
+#endif
 		if (beentry->st_databaseid == InvalidOid) {
 			continue; // backend is not connected to a database
 		}