BUG#39249 Maria:query cache returns out of date results

BUG#41098 Query Cache returns wrong result with concurent insert

BUILD/SETUP.sh:
  test build without query cache setup
BUILD/compile-pentium-debug-max-no-qc:
  test build without query cache
sql/mysql_priv.h:
  removed double declaration
storage/maria/ha_maria.cc:
  query cache invalidation fixed
storage/maria/ma_state.c:
  query cache invalidation fixed
storage/maria/maria_def.h:
  last transaction ID added
  invalidation fixed
storage/myisam/ha_myisam.cc:
  invalidation fixed
storage/myisam/mi_locking.c:
  invalidation fixed
storage/myisam/myisamdef.h:
  invalidation fixed

BUILD/SETUP.sh

@@ -172,6 +172,7 @@ local_infile_configs="--enable-local-infile"
 
 
 max_no_embedded_configs="$SSL_LIBRARY --with-plugins=max"
+max_no_qc_configs="$SSL_LIBRARY --with-plugins=max --without-query-cache"
 max_no_ndb_configs="$SSL_LIBRARY --with-plugins=max-no-ndb --with-embedded-server --with-libevent"
 max_configs="$SSL_LIBRARY --with-plugins=max --with-embedded-server -with-libevent"
 # Disable NDB in maria max builds

BUILD/compile-pentium-debug-max-no-qc

@@ -0,0 +1,9 @@
+#! /bin/sh
+
+path=`dirname $0`
+. "$path/SETUP.sh"
+
+extra_flags="$pentium_cflags $debug_cflags"
+extra_configs="$pentium_configs $debug_configs $max_no_qc_configs"
+
+. "$path/FINISH.sh"

sql/mysql_priv.h

@@ -933,7 +933,6 @@ struct Query_cache_query_flags
 
 #define query_cache_abort(A)
 #define query_cache_end_of_result(A)
-#define query_cache_invalidate_by_MyISAM_filename_ref NULL
 #define query_cache_maybe_disabled(T) 1
 #define query_cache_is_cacheable_query(L) 0
 #endif /*HAVE_QUERY_CACHE*/

storage/maria/ha_maria.cc

@@ -28,6 +28,7 @@
 #include <my_bit.h>
 #include "ha_maria.h"
 #include "trnman_public.h"
+#include "trnman.h"
 
 C_MODE_START
 #include "maria_def.h"
@@ -907,6 +908,8 @@ int ha_maria::open(const char *name, int mode, uint test_if_locked)
   if (!(file= maria_open(name, mode, test_if_locked | HA_OPEN_FROM_SQL_LAYER)))
     return (my_errno ? my_errno : -1);
 
+  file->s->chst_invalidator= query_cache_invalidate_by_MyISAM_filename_ref;
+
   if (test_if_locked & (HA_OPEN_IGNORE_IF_LOCKED | HA_OPEN_TMP_TABLE))
     VOID(maria_extra(file, HA_EXTRA_NO_WAIT_LOCK, 0));
 
@@ -3227,6 +3230,9 @@ my_bool ha_maria::register_query_cache_table(THD *thd, char *table_name,
   */
   *engine_data= 0;
 
+  if (file->s->now_transactional && file->s->have_versioning)
+    return (file->trn->trid >= file->s->state.last_change_trn);
+
   /*
     If a concurrent INSERT has happened just before the currently processed
     SELECT statement, the total size of the table is unknown.

storage/maria/ma_state.c

@@ -318,6 +318,13 @@ void _ma_update_status(void* param)
     DBUG_ASSERT(!info->s->base.born_transactional);
     share->state.state= *info->state;
     info->state= &share->state.state;
+#ifdef HAVE_QUERY_CACHE
+    DBUG_PRINT("info", ("invalidator... '%s' (status update)",
+                        info->s->data_file_name.str));
+    DBUG_ASSERT(info->s->chst_invalidator != NULL);
+    (*info->s->chst_invalidator)((const char *)info->s->data_file_name.str);
+#endif
+
   }
   info->append_insert_at_end= 0;
 }
@@ -469,6 +476,8 @@ my_bool _ma_trnman_end_trans_hook(TRN *trn, my_bool commit,
                                      tables->state_start.checksum);
           history->trid= trn->commit_trid;
 
+          share->state.last_change_trn= trn->commit_trid;
+
           if (history->next)
           {
             /* Remove not visible states */

storage/maria/maria_def.h

@@ -83,6 +83,7 @@ typedef struct st_maria_state_info
   pgcache_page_no_t first_bitmap_with_space;
   ulonglong auto_increment;
   TrID create_trid;                     /* Minum trid for file */
+  TrID last_change_trn;                 /* selfdescriptive */
   ulong update_count;			/* Updated for each write lock */
   ulong status;
   double *rec_per_key_part;
@@ -337,7 +338,10 @@ typedef struct st_maria_share
   /* Mapings to read/write the data file */
   size_t (*file_read)(MARIA_HA *, uchar *, size_t, my_off_t, myf);
   size_t (*file_write)(MARIA_HA *, const uchar *, size_t, my_off_t, myf);
-  invalidator_by_filename invalidator;	/* query cache invalidator */
+  /* query cache invalidator for merged tables */
+  invalidator_by_filename invalidator;
+  /* query cache invalidator for changing state */
+  invalidator_by_filename chst_invalidator;
   my_off_t key_del_current;		/* delete links for index pages */
   ulong this_process;			/* processid */
   ulong last_process;			/* For table-change-check */

storage/myisam/ha_myisam.cc

@@ -660,6 +660,9 @@ int ha_myisam::open(const char *name, int mode, uint test_if_locked)
 
   if (!(file=mi_open(name, mode, test_if_locked | HA_OPEN_FROM_SQL_LAYER)))
     return (my_errno ? my_errno : -1);
+
+  file->s->chst_invalidator= query_cache_invalidate_by_MyISAM_filename_ref;
+
   if (!table->s->tmp_table) /* No need to perform a check for tmp table */
   {
     if ((my_errno= table2myisam(table, &keyinfo, &recinfo, &recs)))

storage/myisam/mi_locking.c

@@ -329,6 +329,12 @@ void mi_update_status(void* param)
 #endif
     info->s->state.state= *info->state;
     info->state= &info->s->state.state;
+#ifdef HAVE_QUERY_CACHE
+    DBUG_PRINT("info", ("invalidator... '%s' (status update)",
+                        info->filename));
+    DBUG_ASSERT(info->s->chst_invalidator != NULL);
+    (*info->s->chst_invalidator)((const char *)info->filename);
+#endif
   }
   info->append_insert_at_end= 0;
 

storage/myisam/myisamdef.h

@@ -190,7 +190,10 @@ typedef struct st_mi_isam_share
                         const uchar *record, my_off_t pos);
     size_t (*file_read) (MI_INFO *, uchar *, size_t, my_off_t, myf);
     size_t (*file_write) (MI_INFO *, const uchar *, size_t, my_off_t, myf);
-  invalidator_by_filename invalidator;  /* query cache invalidator */
+  /* query cache invalidator for merged tables */
+  invalidator_by_filename invalidator;
+  /* query cache invalidator for changing state */
+  invalidator_by_filename chst_invalidator;
   ulong this_process;                   /* processid */
   ulong last_process;                   /* For table-change-check */
   ulong last_version;                   /* Version on start */