Fixed MDEV-4970: Wrong result with Aria table populated with disabled keys

Problem was that ALTER TABLE DISABLE KEYS incremented create_trid for the table,
which made the new index entries invisible until the global trid catched up.

Fixed by only updating create_trid if we are rewriting all rows and indexes.


mysql-test/suite/maria/alter.result:
  Added test case
mysql-test/suite/maria/alter.test:
  Added test case
storage/maria/ha_maria.cc:
  Only updating create_trid if we are doing a full repair (and thus rewriting all rows and indexes).
storage/maria/trnman.c:
  More DBUG_PRINT

mysql-test/suite/maria/alter.result

+drop table if exists t1;
+Warnings:
+Note	1051	Unknown table 't1'
+CREATE TABLE t1 (pk INT, d DATETIME, PRIMARY KEY(pk), KEY(d)) ENGINE=Aria;
+ALTER TABLE t1 DISABLE KEYS;
+INSERT INTO t1 VALUES (1,'2000-01-01 22:22:22'),(2,'2012-12-21 12:12:12');
+INSERT INTO t1 VALUES (3, '2008-07-24');
+ALTER TABLE t1 ENABLE KEYS;
+SELECT t1a.pk FROM t1 AS t1a LEFT JOIN t1 AS t1b ON t1a.pk = t1b.pk;
+pk
+1
+2
+3
+SELECT * FROM t1 AS t1a LEFT JOIN t1 AS t1b ON t1a.pk = t1b.pk;
+pk	d	pk	d
+1	2000-01-01 22:22:22	1	2000-01-01 22:22:22
+2	2012-12-21 12:12:12	2	2012-12-21 12:12:12
+3	2008-07-24 00:00:00	3	2008-07-24 00:00:00
+DROP TABLE t1;
+CREATE TABLE t1 (pk INT PRIMARY KEY, i INT, KEY(i)) ENGINE=Aria;
+ALTER TABLE t1 DISABLE KEYS;
+INSERT INTO t1 VALUES (1,11);
+INSERT INTO t1 VALUES (2,0),(3,33),(4,0),(5,55),(6,66),(7,0),(8,88),(9,99);
+ALTER TABLE t1 ENABLE KEYS;
+SELECT * FROM t1 WHERE i = 0 OR pk BETWEEN 6 AND 10;
+pk	i
+2	0
+4	0
+6	66
+7	0
+8	88
+9	99
+DROP TABLE t1;

mysql-test/suite/maria/alter.test

+# Testing of potential problems in Aria and alter table
+
+-- source include/have_maria.inc
+
+drop table if exists t1;
+
+#
+# MDEV-4970 Wrong result with Aria table populated with disabled keys
+#
+
+CREATE TABLE t1 (pk INT, d DATETIME, PRIMARY KEY(pk), KEY(d)) ENGINE=Aria;
+ALTER TABLE t1 DISABLE KEYS;
+INSERT INTO t1 VALUES (1,'2000-01-01 22:22:22'),(2,'2012-12-21 12:12:12');
+INSERT INTO t1 VALUES (3, '2008-07-24'); 
+ALTER TABLE t1 ENABLE KEYS;
+
+SELECT t1a.pk FROM t1 AS t1a LEFT JOIN t1 AS t1b ON t1a.pk = t1b.pk;
+SELECT * FROM t1 AS t1a LEFT JOIN t1 AS t1b ON t1a.pk = t1b.pk;
+DROP TABLE t1;
+
+CREATE TABLE t1 (pk INT PRIMARY KEY, i INT, KEY(i)) ENGINE=Aria;
+ALTER TABLE t1 DISABLE KEYS;
+INSERT INTO t1 VALUES (1,11);
+INSERT INTO t1 VALUES (2,0),(3,33),(4,0),(5,55),(6,66),(7,0),(8,88),(9,99);
+ALTER TABLE t1 ENABLE KEYS;
+SELECT * FROM t1 WHERE i = 0 OR pk BETWEEN 6 AND 10;
+DROP TABLE t1;

storage/maria/ha_maria.cc

@@ -1547,7 +1547,7 @@ int ha_maria::repair(THD *thd, HA_CHECK *param, bool do_optimize)
 {
   int error= 0;
   ulonglong local_testflag= param->testflag;
-  bool optimize_done= !do_optimize, statistics_done= 0;
+  bool optimize_done= !do_optimize, statistics_done= 0, full_repair_done= 0;
   const char *old_proc_info= thd->proc_info;
   char fixed_name[FN_REFLEN];
   MARIA_SHARE *share= file->s;
@@ -1646,6 +1646,11 @@ int ha_maria::repair(THD *thd, HA_CHECK *param, bool do_optimize)
     }
     param->testflag= save_testflag | (param->testflag & T_RETRY_WITHOUT_QUICK);
     optimize_done= 1;
+    /*
+      set full_repair_done if we re-wrote all rows and all keys
+      (and thus removed all transid's from the table
+    */
+    full_repair_done= !test(param->testflag & T_QUICK);
   }
   if (!error)
   {
@@ -1669,7 +1674,8 @@ int ha_maria::repair(THD *thd, HA_CHECK *param, bool do_optimize)
     }
   }
   thd_proc_info(thd, "Saving state");
-  if (optimize_done && !error && !(param->testflag & T_NO_CREATE_RENAME_LSN))
+  if (full_repair_done && !error &&
+      !(param->testflag & T_NO_CREATE_RENAME_LSN))
   {
     /* Set trid (needed if the table was moved from another system) */
     share->state.create_trid= trnman_get_min_safe_trid();
@@ -1962,6 +1968,7 @@ int ha_maria::enable_indexes(uint mode)
       */
       param.testflag|= T_NO_CREATE_RENAME_LSN;
     }
+
     param.myf_rw &= ~MY_WAIT_IF_FULL;
     param.sort_buffer_length= THDVAR(thd,sort_buffer_size);
     param.stats_method= (enum_handler_stats_method)THDVAR(thd,stats_method);

storage/maria/trnman.c

@@ -383,8 +383,8 @@ TRN *trnman_new_trn(WT_THD *wt)
     return 0;
   }
 
-  DBUG_PRINT("exit", ("trn: 0x%lx  trid: 0x%lu",
-                      (ulong) trn, (ulong) trn->trid));
+  DBUG_PRINT("exit", ("trn: %p  trid: 0x%lu  min_read_from: 0x%lu",
+                      trn, (ulong) trn->trid, (ulong) trn->min_read_from));
 
   DBUG_RETURN(trn);
 }