pg_upgrade: don't copy/link files for invalid indexes

Now that pg_dump no longer dumps invalid indexes, per commit
683abc73, have pg_upgrade also skip
them.  Previously pg_upgrade threw an error if invalid indexes existed.

Backpatch to 9.2, 9.1, and 9.0 (where pg_upgrade was added to git)

contrib/pg_upgrade/check.c

@@ -20,7 +20,6 @@ static void check_is_super_user(ClusterInfo *cluster);
 static void check_for_prepared_transactions(ClusterInfo *cluster);
 static void check_for_isn_and_int8_passing_mismatch(ClusterInfo *cluster);
 static void check_for_reg_data_type_usage(ClusterInfo *cluster);
-static void check_for_invalid_indexes(ClusterInfo *cluster);
 static void get_bin_version(ClusterInfo *cluster);
 static char *get_canonical_locale_name(int category, const char *locale);
 
@@ -97,7 +96,6 @@ check_and_dump_old_cluster(bool live_check, char **sequence_script_file_name)
 	check_is_super_user(&old_cluster);
 	check_for_prepared_transactions(&old_cluster);
 	check_for_reg_data_type_usage(&old_cluster);
-	check_for_invalid_indexes(&old_cluster);
 	check_for_isn_and_int8_passing_mismatch(&old_cluster);
 
 	/* old = PG 8.3 checks? */
@@ -956,95 +954,6 @@ check_for_reg_data_type_usage(ClusterInfo *cluster)
 }
 
 
-/*
- * check_for_invalid_indexes()
- *
- *	CREATE INDEX CONCURRENTLY can create invalid indexes if the index build
- *	fails.  These are dumped as valid indexes by pg_dump, but the
- *	underlying files are still invalid indexes.  This checks to make sure
- *	no invalid indexes exist, either failed index builds or concurrent
- *	indexes in the process of being created.
- */
-static void
-check_for_invalid_indexes(ClusterInfo *cluster)
-{
-	int			dbnum;
-	FILE	   *script = NULL;
-	bool		found = false;
-	char		output_path[MAXPGPATH];
-
-	prep_status("Checking for invalid indexes from concurrent index builds");
-
-	snprintf(output_path, sizeof(output_path), "invalid_indexes.txt");
-
-	for (dbnum = 0; dbnum < cluster->dbarr.ndbs; dbnum++)
-	{
-		PGresult   *res;
-		bool		db_used = false;
-		int			ntups;
-		int			rowno;
-		int			i_nspname,
-					i_relname;
-		DbInfo	   *active_db = &cluster->dbarr.dbs[dbnum];
-		PGconn	   *conn = connectToServer(cluster, active_db->db_name);
-
-		res = executeQueryOrDie(conn,
-								"SELECT n.nspname, c.relname "
-								"FROM	pg_catalog.pg_class c, "
-								"		pg_catalog.pg_namespace n, "
-								"		pg_catalog.pg_index i "
-								"WHERE	(i.indisvalid = false OR "
-								"		 i.indisready = false) AND "
-								"		i.indexrelid = c.oid AND "
-								"		c.relnamespace = n.oid AND "
-								/* we do not migrate these, so skip them */
-							    " 		n.nspname != 'pg_catalog' AND "
-								"		n.nspname != 'information_schema' AND "
-								/* indexes do not have toast tables */
-								"		n.nspname != 'pg_toast'");
-
-		ntups = PQntuples(res);
-		i_nspname = PQfnumber(res, "nspname");
-		i_relname = PQfnumber(res, "relname");
-		for (rowno = 0; rowno < ntups; rowno++)
-		{
-			found = true;
-			if (script == NULL && (script = fopen_priv(output_path, "w")) == NULL)
-				pg_log(PG_FATAL, "Could not open file \"%s\": %s\n",
-					   output_path, getErrorText(errno));
-			if (!db_used)
-			{
-				fprintf(script, "Database: %s\n", active_db->db_name);
-				db_used = true;
-			}
-			fprintf(script, "  %s.%s\n",
-					PQgetvalue(res, rowno, i_nspname),
-					PQgetvalue(res, rowno, i_relname));
-		}
-
-		PQclear(res);
-
-		PQfinish(conn);
-	}
-
-	if (script)
-		fclose(script);
-
-	if (found)
-	{
-		pg_log(PG_REPORT, "fatal\n");
-		pg_log(PG_FATAL,
-			   "Your installation contains invalid indexes due to failed or\n"
-		 	   "currently running CREATE INDEX CONCURRENTLY operations.  You\n"
-			   "cannot upgrade until these indexes are valid or removed.  A\n"
-			   "list of the problem indexes is in the file:\n"
-			   "    %s\n\n", output_path);
-	}
-	else
-		check_ok();
-}
-
-
 static void
 get_bin_version(ClusterInfo *cluster)
 {

contrib/pg_upgrade/info.c

@@ -282,7 +282,13 @@ get_rel_infos(ClusterInfo *cluster, DbInfo *dbinfo)
 			 "CREATE TEMPORARY TABLE info_rels (reloid) AS SELECT c.oid "
 			 "FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n "
 			 "	   ON c.relnamespace = n.oid "
+			 "LEFT OUTER JOIN pg_catalog.pg_index i "
+			 "	   ON c.oid = i.indexrelid "
 			 "WHERE relkind IN ('r', 'm', 'i'%s) AND "
+			/* pg_dump only dumps valid indexes;  testing indisready is
+			 * necessary in 9.2, and harmless in earlier/later versions. */
+			 " i.indisvalid IS DISTINCT FROM false AND "
+			 " i.indisready IS DISTINCT FROM false AND "
 	/* exclude possible orphaned temp tables */
 			 "  ((n.nspname !~ '^pg_temp_' AND "
 			 "    n.nspname !~ '^pg_toast_temp_' AND "