Merge 10.10 into 10.11

31 files changed, 240 insertions, 167 deletions

diff --git a/include/m_ctype.h b/include/m_ctype.h
index 554a7de8e56..708107ff120 100644
--- a/include/m_ctype.h
+++ b/include/m_ctype.h
@@ -96,7 +96,7 @@ typedef struct casefold_info_char_t
 struct casefold_info_st
 {
   my_wc_t maxchar;
-  MY_CASEFOLD_CHARACTER **page;
+  const MY_CASEFOLD_CHARACTER * const *page;
 };
 
 
diff --git a/mysql-test/include/not_valgrind_build.inc b/mysql-test/include/not_valgrind_build.inc
index 2b60f11bfc7..b62a1bc953b 100644
--- a/mysql-test/include/not_valgrind_build.inc
+++ b/mysql-test/include/not_valgrind_build.inc
@@ -1,4 +1,4 @@
-if (`select version() like '%valgrind%'`)
+if (`select version() like '%valgrind%' || version() like '%asan%'`)
 {
-  skip Does not run with binaries built with valgrind;
+  skip Does not run with binaries built with valgrind or asan;
 }
diff --git a/mysql-test/suite/sys_vars/t/innodb_log_checkpoint_now_basic.test b/mysql-test/suite/sys_vars/t/innodb_log_checkpoint_now_basic.test
index 331803fff86..f59ebf649c3 100644
--- a/mysql-test/suite/sys_vars/t/innodb_log_checkpoint_now_basic.test
+++ b/mysql-test/suite/sys_vars/t/innodb_log_checkpoint_now_basic.test
@@ -1,5 +1,7 @@
 --source include/have_innodb.inc
 --source include/have_debug.inc
+# Valgrind builds may block on this one
+--source include/not_valgrind.inc
 
 SET @start_global_value = @@global.innodb_log_checkpoint_now;
 SELECT @start_global_value;
diff --git a/mysys/mulalloc.c b/mysys/mulalloc.c
index 357f9315f2b..51f8d61b574 100644
--- a/mysys/mulalloc.c
+++ b/mysys/mulalloc.c
@@ -17,6 +17,11 @@
 #include "mysys_priv.h"
 #include <stdarg.h>
 
+#ifndef DBUG_OFF
+/* Put a protected barrier after every element when using my_multi_malloc() */
+#define ALLOC_BARRIER
+#endif
+
 /*
   Malloc many pointers at the same time
   Only ptr1 can be free'd, and doing this will free all
@@ -45,6 +50,9 @@ void* my_multi_malloc(PSI_memory_key key, myf myFlags, ...)
   {
     length=va_arg(args,uint);
     tot_length+=ALIGN_SIZE(length);
+#ifdef ALLOC_BARRIER
+    tot_length+= ALIGN_SIZE(1);
+#endif
   }
   va_end(args);
 
@@ -58,6 +66,10 @@ void* my_multi_malloc(PSI_memory_key key, myf myFlags, ...)
     *ptr=res;
     length=va_arg(args,uint);
     res+=ALIGN_SIZE(length);
+#ifdef ALLOC_BARRIER
+    TRASH_FREE(res, ALIGN_SIZE(1));
+    res+= ALIGN_SIZE(1);
+#endif
   }
   va_end(args);
   DBUG_RETURN((void*) start);
@@ -89,6 +101,9 @@ void *my_multi_malloc_large(PSI_memory_key key, myf myFlags, ...)
   {
     length=va_arg(args,ulonglong);
     tot_length+=ALIGN_SIZE(length);
+#ifdef ALLOC_BARRIER
+    tot_length+= ALIGN_SIZE(1);
+#endif
   }
   va_end(args);
 
@@ -102,6 +117,10 @@ void *my_multi_malloc_large(PSI_memory_key key, myf myFlags, ...)
     *ptr=res;
     length=va_arg(args,ulonglong);
     res+=ALIGN_SIZE(length);
+#ifdef ALLOC_BARRIER
+    TRASH_FREE(res, ALIGN_SIZE(1));
+    res+= ALIGN_SIZE(1);
+#endif
   }
   va_end(args);
   DBUG_RETURN((void*) start);
diff --git a/mysys/my_alloc.c b/mysys/my_alloc.c
index a5b855f9604..43f26751f27 100644
--- a/mysys/my_alloc.c
+++ b/mysys/my_alloc.c
@@ -28,6 +28,11 @@
 #undef EXTRA_DEBUG
 #define EXTRA_DEBUG
 
+#ifndef DBUG_OFF
+/* Put a protected barrier after every element when using multi_alloc_root() */
+#define ALLOC_BARRIER
+#endif
+
 /* data packed in MEM_ROOT -> min_malloc */
 
 /* Don't allocate too small blocks */
@@ -396,6 +401,9 @@ void *multi_alloc_root(MEM_ROOT *root, ...)
   {
     length= va_arg(args, uint);
     tot_length+= ALIGN_SIZE(length);
+#ifdef ALLOC_BARRIER
+    tot_length+= ALIGN_SIZE(1);
+#endif
   }
   va_end(args);
 
@@ -409,6 +417,10 @@ void *multi_alloc_root(MEM_ROOT *root, ...)
     *ptr= res;
     length= va_arg(args, uint);
     res+= ALIGN_SIZE(length);
+#ifdef ALLOC_BARRIER
+    TRASH_FREE(res, ALIGN_SIZE(1));
+    res+= ALIGN_SIZE(1);
+#endif
   }
   va_end(args);
   DBUG_RETURN((void*) start);
diff --git a/sql/opt_subselect.cc b/sql/opt_subselect.cc
index 3e2531b90cd..e91b2ad14c3 100644
--- a/sql/opt_subselect.cc
+++ b/sql/opt_subselect.cc
@@ -4186,6 +4186,7 @@ bool setup_sj_materialization_part1(JOIN_TAB *sjm_tab)
   }
 
   sjm->sjm_table_param.field_count= subq_select->item_list.elements;
+  sjm->sjm_table_param.func_count= sjm->sjm_table_param.field_count;
   sjm->sjm_table_param.force_not_null_cols= TRUE;
 
   if (!(sjm->table= create_tmp_table(thd, &sjm->sjm_table_param, 
@@ -5801,14 +5802,14 @@ TABLE *create_dummy_tmp_table(THD *thd)
   DBUG_ENTER("create_dummy_tmp_table");
   TABLE *table;
   TMP_TABLE_PARAM sjm_table_param;
-  sjm_table_param.init();
-  sjm_table_param.field_count= 1;
   List<Item> sjm_table_cols;
   const LEX_CSTRING dummy_name= { STRING_WITH_LEN("dummy") };
   Item *column_item= new (thd->mem_root) Item_int(thd, 1);
   if (!column_item)
     DBUG_RETURN(NULL);
 
+  sjm_table_param.init();
+  sjm_table_param.field_count= sjm_table_param.func_count= 1;
   sjm_table_cols.push_back(column_item, thd->mem_root);
   if (!(table= create_tmp_table(thd, &sjm_table_param, 
                                 sjm_table_cols, (ORDER*) 0, 
diff --git a/sql/select_handler.cc b/sql/select_handler.cc
index 795ed8eb641..b0b8e58623d 100644
--- a/sql/select_handler.cc
+++ b/sql/select_handler.cc
@@ -51,18 +51,19 @@ select_handler::~select_handler()
 
 TABLE *select_handler::create_tmp_table(THD *thd, SELECT_LEX *select)
 {
-  DBUG_ENTER("select_handler::create_tmp_table");
   List<Item> types;
   TMP_TABLE_PARAM tmp_table_param;
+  TABLE *table;
+  DBUG_ENTER("select_handler::create_tmp_table");
+
   if (select->master_unit()->join_union_item_types(thd, types, 1))
     DBUG_RETURN(NULL);
   tmp_table_param.init();
-  tmp_table_param.field_count= types.elements;
-
-  TABLE *table= ::create_tmp_table(thd, &tmp_table_param, types,
-                                   (ORDER *) 0, false, 0,
-                                   TMP_TABLE_ALL_COLUMNS, 1,
-                                   &empty_clex_str, true, false);
+  tmp_table_param.field_count= tmp_table_param.func_count= types.elements;
+  table= ::create_tmp_table(thd, &tmp_table_param, types,
+                            (ORDER *) 0, false, 0,
+                            TMP_TABLE_ALL_COLUMNS, 1,
+                            &empty_clex_str, true, false);
   DBUG_RETURN(table);
 }
 
diff --git a/sql/sql_class.cc b/sql/sql_class.cc
index d433e5ea7e6..e0c6c15a3e2 100644
--- a/sql/sql_class.cc
+++ b/sql/sql_class.cc
@@ -4286,6 +4286,7 @@ create_result_table(THD *thd_arg, List<Item> *column_types,
 {
   DBUG_ASSERT(table == 0);
   tmp_table_param.field_count= column_types->elements;
+  tmp_table_param.func_count= tmp_table_param.field_count;
   tmp_table_param.bit_fields_as_long= bit_fields_as_long;
 
   if (! (table= create_tmp_table(thd_arg, &tmp_table_param, *column_types,
diff --git a/sql/sql_class.h b/sql/sql_class.h
index eeece09d489..54a213d8553 100644
--- a/sql/sql_class.h
+++ b/sql/sql_class.h
@@ -6297,6 +6297,7 @@ public:
     @see opt_sum_query, count_field_types
   */
   uint  sum_func_count;   
+  uint  copy_func_count;                        // Allocated copy fields
   uint  hidden_field_count;
   uint	group_parts,group_length,group_null_parts;
 
diff --git a/sql/sql_expression_cache.cc b/sql/sql_expression_cache.cc
index bc44ecd79fa..69d85f3343d 100644
--- a/sql/sql_expression_cache.cc
+++ b/sql/sql_expression_cache.cc
@@ -114,7 +114,7 @@ void Expression_cache_tmptable::init()
 
   cache_table_param.init();
   /* dependent items and result */
-  cache_table_param.field_count= items.elements;
+  cache_table_param.field_count= cache_table_param.func_count= items.elements;
   /* postpone table creation to index description */
   cache_table_param.skip_create_table= 1;
 
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index f98878e46bf..51bef49277e 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -3546,7 +3546,8 @@ bool JOIN::make_aggr_tables_info()
 
       if (gbh)
       {
-        if (!(pushdown_query= new (thd->mem_root) Pushdown_query(select_lex, gbh)))
+        if (!(pushdown_query= new (thd->mem_root) Pushdown_query(select_lex,
+                                                                 gbh)))
           DBUG_RETURN(1);
         /*
           We must store rows in the tmp table if we need to do an ORDER BY
@@ -3566,6 +3567,7 @@ bool JOIN::make_aggr_tables_info()
 
         if (!(curr_tab->tmp_table_param= new TMP_TABLE_PARAM(tmp_table_param)))
           DBUG_RETURN(1);
+        curr_tab->tmp_table_param->func_count= all_fields.elements;
         TABLE* table= create_tmp_table(thd, curr_tab->tmp_table_param,
                                        all_fields,
                                        NULL, distinct,
@@ -19600,6 +19602,7 @@ TABLE *Create_tmp_table::start(THD *thd,
   */
   if (param->precomputed_group_by)
     copy_func_count+= param->sum_func_count;
+  param->copy_func_count= copy_func_count;
   
   init_sql_alloc(key_memory_TABLE, &own_root, TABLE_ALLOC_BLOCK_SIZE, 0,
                  MYF(MY_THREAD_SPECIFIC));
@@ -19805,8 +19808,9 @@ bool Create_tmp_table::add_fields(THD *thd,
         We here distinguish between UNION and multi-table-updates by the fact
         that in the later case group is set to the row pointer.
 
-        The test for item->marker == 4 is ensure we don't create a group-by
-        key over a bit field as heap tables can't handle that.
+        The test for item->marker == MARKER_NULL_KEY is ensure we
+        don't create a group-by key over a bit field as heap tables
+        can't handle that.
       */
       DBUG_ASSERT(!param->schema_table);
       Field *new_field=
@@ -19873,6 +19877,7 @@ bool Create_tmp_table::add_fields(THD *thd,
         new_field->flags|= FIELD_PART_OF_TMP_UNIQUE;
     }
   }
+
   DBUG_ASSERT(fieldnr == m_field_count[other] + m_field_count[distinct]);
   DBUG_ASSERT(m_blob_count == m_blobs_count[other] + m_blobs_count[distinct]);
   share->fields= fieldnr;
@@ -19881,6 +19886,8 @@ bool Create_tmp_table::add_fields(THD *thd,
   share->blob_field[m_blob_count]= 0;           // End marker
   copy_func[0]= 0;                              // End marker
   param->func_count= (uint) (copy_func - param->items_to_copy);
+  DBUG_ASSERT(param->func_count <= param->copy_func_count);
+
   share->column_bitmap_size= bitmap_buffer_size(share->fields);
 
   thd->mem_root= mem_root_save;
@@ -27337,6 +27344,11 @@ bool JOIN::rollup_init()
   Item **ref_array;
 
   tmp_table_param.quick_group= 0;	// Can't create groups in tmp table
+  /*
+    Each group can potentially be replaced with Item_func_rollup_const() which
+    needs a copy_func placeholder.
+  */
+  tmp_table_param.func_count+= send_group_parts;
   rollup.state= ROLLUP::STATE_INITED;
 
   /*
@@ -27361,7 +27373,6 @@ bool JOIN::rollup_init()
 
   ref_array= (Item**) (rollup.ref_pointer_arrays+send_group_parts);
 
-
   /*
     Prepare space for field list for the different levels
     These will be filled up in rollup_make_fields()
@@ -27525,7 +27536,6 @@ bool JOIN::rollup_make_fields(List<Item> &fields_arg, List<Item> &sel_fields,
     /* Point to first hidden field */
     uint ref_array_ix= fields_arg.elements-1;
 
-
     /* Remember where the sum functions ends for the previous level */
     sum_funcs_end[pos+1]= *func;
 
diff --git a/sql/sql_show.cc b/sql/sql_show.cc
index 8e7b5becc66..320f9f4f97c 100644
--- a/sql/sql_show.cc
+++ b/sql/sql_show.cc
@@ -8402,27 +8402,34 @@ TABLE *create_schema_table(THD *thd, TABLE_LIST *table_list)
   TABLE *table;
   ST_SCHEMA_TABLE *schema_table= table_list->schema_table;
   ST_FIELD_INFO *fields= schema_table->fields_info;
-  bool need_all_fieds= table_list->schema_table_reformed || // SHOW command
+  bool need_all_fields= table_list->schema_table_reformed || // SHOW command
                        thd->lex->only_view_structure(); // need table structure
+  bool keep_row_order;
+  TMP_TABLE_PARAM *tmp_table_param;
+  SELECT_LEX *select_lex;
   DBUG_ENTER("create_schema_table");
 
   for (; !fields->end_marker(); fields++)
     field_count++;
 
-  TMP_TABLE_PARAM *tmp_table_param = new (thd->mem_root) TMP_TABLE_PARAM;
+  tmp_table_param = new (thd->mem_root) TMP_TABLE_PARAM;
   tmp_table_param->init();
   tmp_table_param->table_charset= system_charset_info;
   tmp_table_param->field_count= field_count;
   tmp_table_param->schema_table= 1;
-  SELECT_LEX *select_lex= table_list->select_lex;
-  bool keep_row_order= is_show_command(thd);
-  if (!(table= create_tmp_table_for_schema(thd, tmp_table_param, *schema_table,
-                 (select_lex->options | thd->variables.option_bits | TMP_TABLE_ALL_COLUMNS),
-                  table_list->alias, !need_all_fieds, keep_row_order)))
+  select_lex= table_list->select_lex;
+  keep_row_order= is_show_command(thd);
+  if (!(table=
+        create_tmp_table_for_schema(thd, tmp_table_param, *schema_table,
+                                    (select_lex->options |
+                                     thd->variables.option_bits |
+                                     TMP_TABLE_ALL_COLUMNS),
+                                    table_list->alias, !need_all_fields,
+                                    keep_row_order)))
     DBUG_RETURN(0);
   my_bitmap_map* bitmaps=
     (my_bitmap_map*) thd->alloc(bitmap_buffer_size(field_count));
-  my_bitmap_init(&table->def_read_set, (my_bitmap_map*) bitmaps, field_count);
+  my_bitmap_init(&table->def_read_set, bitmaps, field_count);
   table->read_set= &table->def_read_set;
   bitmap_clear_all(table->read_set);
   table_list->schema_table_param= tmp_table_param;
diff --git a/sql/sql_union.cc b/sql/sql_union.cc
index 0a92422676a..6f96069e46a 100644
--- a/sql/sql_union.cc
+++ b/sql/sql_union.cc
@@ -344,6 +344,7 @@ select_unit::create_result_table(THD *thd_arg, List<Item> *column_types,
   DBUG_ASSERT(table == 0);
   tmp_table_param.init();
   tmp_table_param.field_count= column_types->elements;
+  tmp_table_param.func_count= tmp_table_param.field_count;
   tmp_table_param.bit_fields_as_long= bit_fields_as_long;
   tmp_table_param.hidden_field_count= hidden;
 
@@ -384,7 +385,8 @@ select_union_recursive::create_result_table(THD *thd_arg,
     return true;
   
   incr_table_param.init();
-  incr_table_param.field_count= column_types->elements;
+  incr_table_param.field_count= incr_table_param.func_count=
+    column_types->elements;
   incr_table_param.bit_fields_as_long= bit_fields_as_long;
   if (! (incr_table= create_tmp_table(thd_arg, &incr_table_param, *column_types,
                                       (ORDER*) 0, false, 1,
diff --git a/sql/temporary_tables.cc b/sql/temporary_tables.cc
index b43a38e7fa2..c69059f8712 100644
--- a/sql/temporary_tables.cc
+++ b/sql/temporary_tables.cc
@@ -921,9 +921,8 @@ bool THD::has_temporary_tables()
 uint THD::create_tmp_table_def_key(char *key, const char *db,
                                     const char *table_name)
 {
-  DBUG_ENTER("THD::create_tmp_table_def_key");
-
   uint key_length;
+  DBUG_ENTER("THD::create_tmp_table_def_key");
 
   key_length= tdc_create_key(key, db, table_name);
   int4store(key + key_length, variables.server_id);
@@ -1172,11 +1171,10 @@ TABLE *THD::open_temporary_table(TMP_TABLE_SHARE *share,
 */
 bool THD::find_and_use_tmp_table(const TABLE_LIST *tl, TABLE **out_table)
 {
-  DBUG_ENTER("THD::find_and_use_tmp_table");
-
   char key[MAX_DBKEY_LENGTH];
   uint key_length;
   bool result;
+  DBUG_ENTER("THD::find_and_use_tmp_table");
 
   key_length= create_tmp_table_def_key(key, tl->get_db_name(),
                                         tl->get_table_name());
diff --git a/storage/innobase/btr/btr0cur.cc b/storage/innobase/btr/btr0cur.cc
index ec1b72244b4..8d19064a658 100644
--- a/storage/innobase/btr/btr0cur.cc
+++ b/storage/innobase/btr/btr0cur.cc
@@ -1011,9 +1011,10 @@ dberr_t btr_cur_t::search_leaf(const dtuple_t *tuple, page_cur_mode_t mode,
 #  ifdef UNIV_SEARCH_PERF_STAT
   info->n_searches++;
 #  endif
+  bool ahi_enabled= btr_search_enabled && !index()->is_ibuf();
   /* We do a dirty read of btr_search_enabled below,
      and btr_search_guess_on_hash() will have to check it again. */
-  if (!btr_search_enabled);
+  if (!ahi_enabled);
   else if (btr_search_guess_on_hash(index(), info, tuple, mode,
                                     latch_mode, this, mtr))
   {
@@ -1335,7 +1336,7 @@ release_tree:
 
   reached_latched_leaf:
 #ifdef BTR_CUR_HASH_ADAPT
-    if (btr_search_enabled && !(tuple->info_bits & REC_INFO_MIN_REC_FLAG))
+    if (ahi_enabled && !(tuple->info_bits & REC_INFO_MIN_REC_FLAG))
     {
       if (page_cur_search_with_match_bytes(tuple, mode,
                                            &up_match, &up_bytes,
diff --git a/storage/innobase/include/trx0trx.h b/storage/innobase/include/trx0trx.h
index 0450be89cfb..7d2c3297769 100644
--- a/storage/innobase/include/trx0trx.h
+++ b/storage/innobase/include/trx0trx.h
@@ -1109,6 +1109,8 @@ public:
     ut_ad(!dict_operation);
     ut_ad(!apply_online_log);
     ut_ad(!is_not_inheriting_locks());
+    ut_ad(check_foreigns);
+    ut_ad(check_unique_secondary);
   }
 
   /** This has to be invoked on SAVEPOINT or at the end of a statement.
diff --git a/storage/innobase/trx/trx0purge.cc b/storage/innobase/trx/trx0purge.cc
index 4072ba2f440..867126adc0e 100644
--- a/storage/innobase/trx/trx0purge.cc
+++ b/storage/innobase/trx/trx0purge.cc
@@ -397,6 +397,7 @@ static dberr_t
 trx_purge_free_segment(mtr_t &mtr, trx_rseg_t* rseg, fil_addr_t hdr_addr)
 {
   mtr.commit();
+  log_free_check();
   mtr.start();
 
   const page_id_t hdr_page_id{rseg->space->id, hdr_addr.page};
@@ -404,61 +405,48 @@ trx_purge_free_segment(mtr_t &mtr, trx_rseg_t* rseg, fil_addr_t hdr_addr)
   buf_block_t *rseg_hdr= rseg->get(&mtr, &err);
   if (!rseg_hdr)
     return err;
-  if (buf_block_t *block= buf_page_get_gen(hdr_page_id, 0, RW_X_LATCH,
-                                           nullptr, BUF_GET_POSSIBLY_FREED,
-                                           &mtr, &err))
-  {
-    /* Mark the last undo log totally purged, so that if the system
-    crashes, the tail of the undo log will not get accessed again. The
-    list of pages in the undo log tail gets inconsistent during the
-    freeing of the segment, and therefore purge should not try to
-    access them again. */
-    mtr.write<2,mtr_t::MAYBE_NOP>(*block, block->page.frame +
-                                  hdr_addr.boffset + TRX_UNDO_NEEDS_PURGE, 0U);
-    while (!fseg_free_step_not_header(TRX_UNDO_SEG_HDR + TRX_UNDO_FSEG_HEADER +
-                                      block->page.frame, &mtr))
-    {
-      rseg_hdr->fix();
-      block->fix();
-      mtr.commit();
-      mtr.start();
-      rseg_hdr->page.lock.x_lock();
-      block->page.lock.x_lock();
-      mtr.memo_push(rseg_hdr, MTR_MEMO_PAGE_X_FIX);
-      mtr.memo_push(block, MTR_MEMO_PAGE_X_MODIFY);
-    }
+  buf_block_t *block= buf_page_get_gen(hdr_page_id, 0, RW_X_LATCH,
+                                       nullptr, BUF_GET_POSSIBLY_FREED,
+                                       &mtr, &err);
+  if (!block)
+    return err;
+
+  const uint32_t seg_size=
+    flst_get_len(TRX_UNDO_SEG_HDR + TRX_UNDO_PAGE_LIST + block->page.frame);
+
+  err= trx_purge_remove_log_hdr(rseg_hdr, block, hdr_addr.boffset, &mtr);
+  if (UNIV_UNLIKELY(err != DB_SUCCESS))
+    return err;
+
+  ut_ad(rseg->curr_size >= seg_size);
+  rseg->curr_size-= seg_size;
+  rseg->history_size--;
+
+  byte *hist= TRX_RSEG + TRX_RSEG_HISTORY_SIZE + rseg_hdr->page.frame;
+  ut_ad(mach_read_from_4(hist) >= seg_size);
+  mtr.write<4>(*rseg_hdr, hist, mach_read_from_4(hist) - seg_size);
 
-    /* The page list may now be inconsistent, but the length field
-    stored in the list base node tells us how big it was before we
-    started the freeing. */
-    const uint32_t seg_size=
-      flst_get_len(TRX_UNDO_SEG_HDR + TRX_UNDO_PAGE_LIST + block->page.frame);
-
-    /* We may free the undo log segment header page; it must be freed
-    within the same mtr as the undo log header is removed from the
-    history list: otherwise, in case of a database crash, the segment
-    could become inaccessible garbage in the file space. */
-    err= trx_purge_remove_log_hdr(rseg_hdr, block, hdr_addr.boffset, &mtr);
-    if (UNIV_UNLIKELY(err != DB_SUCCESS))
-      return err;
-    byte *hist= TRX_RSEG + TRX_RSEG_HISTORY_SIZE + rseg_hdr->page.frame;
-    if (UNIV_UNLIKELY(mach_read_from_4(hist) < seg_size))
-      return DB_CORRUPTION;
-    mtr.write<4>(*rseg_hdr, hist, mach_read_from_4(hist) - seg_size);
-
-    /* Here we assume that a file segment with just the header page
-    can be freed in a few steps, so that the buffer pool is not
-    flooded with bufferfixed pages: see the note in fsp0fsp.cc. */
-    while (!fseg_free_step(TRX_UNDO_SEG_HDR + TRX_UNDO_FSEG_HEADER +
-                           block->page.frame, &mtr));
-
-    ut_ad(rseg->curr_size >= seg_size);
-
-    rseg->history_size--;
-    rseg->curr_size -= seg_size;
+  while (!fseg_free_step_not_header(TRX_UNDO_SEG_HDR + TRX_UNDO_FSEG_HEADER +
+                                    block->page.frame, &mtr))
+  {
+    block->fix();
+    mtr.commit();
+    /* NOTE: If the server is killed after the log that was produced
+    up to this point was written, and before the log from the mtr.commit()
+    in our caller is written, then the pages belonging to the
+    undo log will become unaccessible garbage.
+
+    This does not matters when using multiple innodb_undo_tablespaces;
+    innodb_undo_log_truncate=ON will be able to reclaim the space. */
+    log_free_check();
+    mtr.start();
+    block->page.lock.x_lock();
+    mtr.memo_push(block, MTR_MEMO_PAGE_X_MODIFY);
   }
 
-  return err;
+  while (!fseg_free_step(TRX_UNDO_SEG_HDR + TRX_UNDO_FSEG_HEADER +
+                         block->page.frame, &mtr));
+  return DB_SUCCESS;
 }
 
 /** Remove unnecessary history data from a rollback segment.
diff --git a/storage/innobase/trx/trx0trx.cc b/storage/innobase/trx/trx0trx.cc
index 3352447ea63..454afba4321 100644
--- a/storage/innobase/trx/trx0trx.cc
+++ b/storage/innobase/trx/trx0trx.cc
@@ -385,9 +385,10 @@ void trx_t::free()
 
   dict_operation= false;
   trx_sys.deregister_trx(this);
+  check_unique_secondary= true;
+  check_foreigns= true;
   assert_freed();
   trx_sys.rw_trx_hash.put_pins(this);
-
   mysql_thd= nullptr;
 
   // FIXME: We need to avoid this heap free/alloc for each commit.
@@ -1377,6 +1378,8 @@ void trx_t::commit_cleanup()
   state= TRX_STATE_NOT_STARTED;
   mod_tables.clear();
 
+  check_foreigns= true;
+  check_unique_secondary= true;
   assert_freed();
   trx_init(this);
   mutex.wr_unlock();
diff --git a/storage/maria/ha_maria.cc b/storage/maria/ha_maria.cc
index 21d9a00b94e..c245dcea036 100644
--- a/storage/maria/ha_maria.cc
+++ b/storage/maria/ha_maria.cc
@@ -2690,12 +2690,22 @@ int ha_maria::info(uint flag)
     share->db_record_offset= maria_info.record_offset;
     if (share->key_parts)
     {
-      ulong *to= table->key_info[0].rec_per_key, *end;
       double *from= maria_info.rec_per_key;
-      for (end= to+ share->key_parts ; to < end ; to++, from++)
-        *to= (ulong) (*from + 0.5);
+      KEY *key, *key_end;
+      for (key= table->key_info, key_end= key + share->keys;
+           key < key_end ; key++)
+      {
+        ulong *to= key->rec_per_key;
+        /* Some temporary tables does not allocate rec_per_key */
+        if (to)
+        {
+          for (ulong *end= to+ key->user_defined_key_parts ;
+               to < end ;
+               to++, from++)
+            *to= (ulong) (*from + 0.5);
+        }
+      }
     }
-
     /*
        Set data_file_name and index_file_name to point at the symlink value
        if table is symlinked (Ie;  Real name is not same as generated name)
diff --git a/storage/maria/ma_blockrec.c b/storage/maria/ma_blockrec.c
index baa777edcf0..98ef5c21e55 100644
--- a/storage/maria/ma_blockrec.c
+++ b/storage/maria/ma_blockrec.c
@@ -2780,7 +2780,8 @@ static my_bool write_block_record(MARIA_HA *info,
     const uchar *field_pos;
     ulong length;
     if ((record[column->null_pos] & column->null_bit) ||
-        (row->empty_bits[column->empty_pos] & column->empty_bit))
+        (column->empty_bit &&
+         (row->empty_bits[column->empty_pos] & column->empty_bit)))
       continue;
 
     field_pos= record + column->offset;
@@ -4887,7 +4888,8 @@ int _ma_read_block_record2(MARIA_HA *info, uchar *record,
     uchar *field_pos= record + column->offset;
     /* First check if field is present in record */
     if ((record[column->null_pos] & column->null_bit) ||
-        (cur_row->empty_bits[column->empty_pos] & column->empty_bit))
+        (column->empty_bit &&
+         (cur_row->empty_bits[column->empty_pos] & column->empty_bit)))
     {
       bfill(record + column->offset, column->fill_length,
             type == FIELD_SKIP_ENDSPACE ? ' ' : 0);
@@ -4970,8 +4972,9 @@ int _ma_read_block_record2(MARIA_HA *info, uchar *record,
         {
           uint size_length;
           if ((record[blob_field->null_pos] & blob_field->null_bit) ||
-              (cur_row->empty_bits[blob_field->empty_pos] &
-               blob_field->empty_bit))
+              (blob_field->empty_bit &
+               (cur_row->empty_bits[blob_field->empty_pos] &
+                blob_field->empty_bit)))
             continue;
           size_length= blob_field->length - portable_sizeof_char_ptr;
           blob_lengths+= _ma_calc_blob_length(size_length, length_data);
@@ -5825,7 +5828,8 @@ static size_t fill_insert_undo_parts(MARIA_HA *info, const uchar *record,
     const uchar *column_pos;
     size_t column_length;
     if ((record[column->null_pos] & column->null_bit) ||
-        cur_row->empty_bits[column->empty_pos] & column->empty_bit)
+        (column->empty_bit &&
+         cur_row->empty_bits[column->empty_pos] & column->empty_bit))
       continue;
 
     column_pos=    record+ column->offset;
@@ -6006,7 +6010,8 @@ static size_t fill_update_undo_parts(MARIA_HA *info, const uchar *oldrec,
       */
       continue;
     }
-    if (old_row->empty_bits[column->empty_pos] & column->empty_bit)
+    if (column->empty_bit &&
+        (old_row->empty_bits[column->empty_pos] & column->empty_bit))
     {
       if (new_row->empty_bits[column->empty_pos] & column->empty_bit)
         continue;                               /* Both are empty; skip */
@@ -6022,8 +6027,9 @@ static size_t fill_update_undo_parts(MARIA_HA *info, const uchar *oldrec,
       log the original value
     */
     new_column_is_empty= ((newrec[column->null_pos] & column->null_bit) ||
-                          (new_row->empty_bits[column->empty_pos] &
-                           column->empty_bit));
+                          (column->empty_bit &&
+                           (new_row->empty_bits[column->empty_pos] &
+                            column->empty_bit)));
 
     old_column_pos=      oldrec + column->offset;
     new_column_pos=      newrec + column->offset;
@@ -7196,7 +7202,8 @@ my_bool _ma_apply_undo_row_delete(MARIA_HA *info, LSN undo_lsn,
        column++, null_field_lengths++)
   {
     if ((record[column->null_pos] & column->null_bit) ||
-        row.empty_bits[column->empty_pos] & column->empty_bit)
+        (column->empty_bit &&
+         row.empty_bits[column->empty_pos] & column->empty_bit))
     {
       if (column->type != FIELD_BLOB)
         *null_field_lengths= 0;
diff --git a/storage/maria/ma_open.c b/storage/maria/ma_open.c
index 2d9174b4380..7702355b7d1 100644
--- a/storage/maria/ma_open.c
+++ b/storage/maria/ma_open.c
@@ -117,7 +117,7 @@ static MARIA_HA *maria_clone_internal(MARIA_SHARE *share,
 		       &info.blobs,sizeof(MARIA_BLOB)*share->base.blobs,
 		       &info.buff,(share->base.max_key_block_length*2+
 				   share->base.max_key_length),
-		       &info.lastkey_buff,share->base.max_key_length*2+1,
+		       &info.lastkey_buff,share->base.max_key_length*3,
 		       &info.first_mbr_key, share->base.max_key_length,
 		       &info.maria_rtree_recursion_state,
                        share->have_rtree ? 1024 : 0,
diff --git a/storage/myisam/ha_myisam.cc b/storage/myisam/ha_myisam.cc
index a1de9edd997..c0419da7e71 100644
--- a/storage/myisam/ha_myisam.cc
+++ b/storage/myisam/ha_myisam.cc
@@ -2144,9 +2144,17 @@ int ha_myisam::info(uint flag)
     share->keys_for_keyread.intersect(share->keys_in_use);
     share->db_record_offset= misam_info.record_offset;
     if (share->key_parts)
-      memcpy((char*) table->key_info[0].rec_per_key,
-	     (char*) misam_info.rec_per_key,
-             sizeof(table->key_info[0].rec_per_key[0])*share->key_parts);
+    {
+      ulong *from= misam_info.rec_per_key;
+      KEY *key, *key_end;
+      for (key= table->key_info, key_end= key + share->keys;
+           key < key_end ; key++)
+      {
+        memcpy(key->rec_per_key, from,
+               key->user_defined_key_parts * sizeof(*from));
+        from+= key->user_defined_key_parts;
+      }
+    }
     if (table_share->tmp_table == NO_TMP_TABLE)
       mysql_mutex_unlock(&table_share->LOCK_share);
   }
diff --git a/strings/ctype-big5.c b/strings/ctype-big5.c
index c644a74ceb6..ef01b45aec0 100644
--- a/strings/ctype-big5.c
+++ b/strings/ctype-big5.c
@@ -187,7 +187,7 @@ static const uchar sort_order_big5[]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cA2[256]=
+static const MY_CASEFOLD_CHARACTER cA2[256]=
 {
   /* A200-A20F */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -380,7 +380,7 @@ static MY_CASEFOLD_CHARACTER cA2[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cA3[256]=
+static const MY_CASEFOLD_CHARACTER cA3[256]=
 {
   /* A300-A30F */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -573,7 +573,7 @@ static MY_CASEFOLD_CHARACTER cA3[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cC7[256]=
+static const MY_CASEFOLD_CHARACTER cC7[256]=
 {
   /* C700-C70F */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -766,7 +766,7 @@ static MY_CASEFOLD_CHARACTER cC7[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER *my_casefold_pages_big5[256]=
+static const MY_CASEFOLD_CHARACTER *my_casefold_pages_big5[256]=
 {
   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 0 */
   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
diff --git a/strings/ctype-cp932.c b/strings/ctype-cp932.c
index dfc7621b89d..0f1e8457072 100644
--- a/strings/ctype-cp932.c
+++ b/strings/ctype-cp932.c
@@ -197,7 +197,7 @@ static const uchar sort_order_cp932[]=
 #define cp932code(c,d)	((((uint) (uchar)(c)) << 8) | (uint) (uchar) (d))
 
 
-static MY_CASEFOLD_CHARACTER c81[256]=
+static const MY_CASEFOLD_CHARACTER c81[256]=
 {
   /* 8100-810F */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -407,7 +407,7 @@ static MY_CASEFOLD_CHARACTER c81[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER c82[256]=
+static const MY_CASEFOLD_CHARACTER c82[256]=
 {
   /* 8200-820F */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -615,7 +615,7 @@ static MY_CASEFOLD_CHARACTER c82[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER c83[256]=
+static const MY_CASEFOLD_CHARACTER c83[256]=
 {
   /* 8300-830F */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -825,7 +825,7 @@ static MY_CASEFOLD_CHARACTER c83[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER c84[256]=
+static const MY_CASEFOLD_CHARACTER c84[256]=
 {
   /* 8400-840F */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -1035,7 +1035,7 @@ static MY_CASEFOLD_CHARACTER c84[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER c87[256]=
+static const MY_CASEFOLD_CHARACTER c87[256]=
 {
   /* 8700-870F */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -1245,7 +1245,7 @@ static MY_CASEFOLD_CHARACTER c87[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cEE[256]=
+static const MY_CASEFOLD_CHARACTER cEE[256]=
 {
   /* EE00-EE0F */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -1456,7 +1456,7 @@ static MY_CASEFOLD_CHARACTER cEE[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cFA[256]=
+static const MY_CASEFOLD_CHARACTER cFA[256]=
 {
   /* FA00-FA0F */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -1666,7 +1666,7 @@ static MY_CASEFOLD_CHARACTER cFA[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER *my_casefold_pages_cp932[256]=
+static const MY_CASEFOLD_CHARACTER *my_casefold_pages_cp932[256]=
 {
   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 0 */
   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
diff --git a/strings/ctype-euc_kr.c b/strings/ctype-euc_kr.c
index 583919330c9..ab27074f20d 100644
--- a/strings/ctype-euc_kr.c
+++ b/strings/ctype-euc_kr.c
@@ -213,7 +213,7 @@ static const uchar sort_order_euc_kr[]=
 #include "ctype-mb.inl"
 
 
-static MY_CASEFOLD_CHARACTER cA3[256]=
+static const MY_CASEFOLD_CHARACTER cA3[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -418,7 +418,7 @@ static MY_CASEFOLD_CHARACTER cA3[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cA5[256]=
+static const MY_CASEFOLD_CHARACTER cA5[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -623,7 +623,7 @@ static MY_CASEFOLD_CHARACTER cA5[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cA7[256]=
+static const MY_CASEFOLD_CHARACTER cA7[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -828,7 +828,7 @@ static MY_CASEFOLD_CHARACTER cA7[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cA8[256]=
+static const MY_CASEFOLD_CHARACTER cA8[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -1033,7 +1033,7 @@ static MY_CASEFOLD_CHARACTER cA8[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cA9[256]=
+static const MY_CASEFOLD_CHARACTER cA9[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -1238,7 +1238,7 @@ static MY_CASEFOLD_CHARACTER cA9[256]=
 };  
 
 
-static MY_CASEFOLD_CHARACTER cAC[256]=
+static const MY_CASEFOLD_CHARACTER cAC[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -1443,7 +1443,7 @@ static MY_CASEFOLD_CHARACTER cAC[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER *my_casefold_pages_euckr[256]=
+static const MY_CASEFOLD_CHARACTER *my_casefold_pages_euckr[256]=
 {
   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 0 */
   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
diff --git a/strings/ctype-eucjpms.c b/strings/ctype-eucjpms.c
index f784ca8720f..1812c74d465 100644
--- a/strings/ctype-eucjpms.c
+++ b/strings/ctype-eucjpms.c
@@ -250,7 +250,7 @@ static const uchar sort_order_eucjpms[]=
 
 /* Case info pages for JIS-X-0208 range */
 
-static MY_CASEFOLD_CHARACTER cA2[256]=
+static const MY_CASEFOLD_CHARACTER cA2[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -371,7 +371,7 @@ static MY_CASEFOLD_CHARACTER cA2[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cA3[256]=
+static const MY_CASEFOLD_CHARACTER cA3[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -492,7 +492,7 @@ static MY_CASEFOLD_CHARACTER cA3[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cA6[256]=
+static const MY_CASEFOLD_CHARACTER cA6[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -613,7 +613,7 @@ static MY_CASEFOLD_CHARACTER cA6[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cA7[256]=
+static const MY_CASEFOLD_CHARACTER cA7[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -734,7 +734,7 @@ static MY_CASEFOLD_CHARACTER cA7[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cAD[256]=
+static const MY_CASEFOLD_CHARACTER cAD[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -857,7 +857,7 @@ static MY_CASEFOLD_CHARACTER cAD[256]=
 
 /* Case info pages for JIS-X-0212 range */
 
-static MY_CASEFOLD_CHARACTER c8FA6[256]=
+static const MY_CASEFOLD_CHARACTER c8FA6[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -978,7 +978,7 @@ static MY_CASEFOLD_CHARACTER c8FA6[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER c8FA7[256]=
+static const MY_CASEFOLD_CHARACTER c8FA7[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -1099,7 +1099,7 @@ static MY_CASEFOLD_CHARACTER c8FA7[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER c8FA9[256]=
+static const MY_CASEFOLD_CHARACTER c8FA9[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -1220,7 +1220,7 @@ static MY_CASEFOLD_CHARACTER c8FA9[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER c8FAA[256]=
+static const MY_CASEFOLD_CHARACTER c8FAA[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -1341,7 +1341,7 @@ static MY_CASEFOLD_CHARACTER c8FAA[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER c8FAB[256]=
+static const MY_CASEFOLD_CHARACTER c8FAB[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -1462,7 +1462,7 @@ static MY_CASEFOLD_CHARACTER c8FAB[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER c8FF3[256]=
+static const MY_CASEFOLD_CHARACTER c8FF3[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -1583,7 +1583,7 @@ static MY_CASEFOLD_CHARACTER c8FF3[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER c8FF4[256]=
+static const MY_CASEFOLD_CHARACTER c8FF4[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -1704,7 +1704,7 @@ static MY_CASEFOLD_CHARACTER c8FF4[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER *my_casefold_pages_eucjpms[512]=
+static const MY_CASEFOLD_CHARACTER *my_casefold_pages_eucjpms[512]=
 {
   /* JIS-X-0208 */
   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 0 */
diff --git a/strings/ctype-gb2312.c b/strings/ctype-gb2312.c
index 6499a081181..9e6ed3cfabe 100644
--- a/strings/ctype-gb2312.c
+++ b/strings/ctype-gb2312.c
@@ -177,7 +177,7 @@ static const uchar sort_order_gb2312[]=
 #include "ctype-mb.inl"
 
 
-static MY_CASEFOLD_CHARACTER cA2[256]=
+static const MY_CASEFOLD_CHARACTER cA2[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -298,7 +298,7 @@ static MY_CASEFOLD_CHARACTER cA2[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cA3[256]=
+static const MY_CASEFOLD_CHARACTER cA3[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -419,7 +419,7 @@ static MY_CASEFOLD_CHARACTER cA3[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cA6[256]=
+static const MY_CASEFOLD_CHARACTER cA6[256]=
 { 
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -540,7 +540,7 @@ static MY_CASEFOLD_CHARACTER cA6[256]=
 };
   
 
-static MY_CASEFOLD_CHARACTER cA7[256]=
+static const MY_CASEFOLD_CHARACTER cA7[256]=
 {  
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -661,7 +661,7 @@ static MY_CASEFOLD_CHARACTER cA7[256]=
 };
   
 
-static MY_CASEFOLD_CHARACTER cA8[256]=
+static const MY_CASEFOLD_CHARACTER cA8[256]=
 { 
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -782,7 +782,7 @@ static MY_CASEFOLD_CHARACTER cA8[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER *my_casefold_pages_gb2312[256]=
+static const MY_CASEFOLD_CHARACTER *my_casefold_pages_gb2312[256]=
 {
   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 0 */
   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
diff --git a/strings/ctype-gbk.c b/strings/ctype-gbk.c
index 1287602b12b..a81e2465157 100644
--- a/strings/ctype-gbk.c
+++ b/strings/ctype-gbk.c
@@ -147,7 +147,7 @@ static const uchar to_upper_gbk[]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cA2[256]=
+static const MY_CASEFOLD_CHARACTER cA2[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -351,7 +351,7 @@ static MY_CASEFOLD_CHARACTER cA2[256]=
   {0xA2FF,0xA2FF}
 };
 
-static MY_CASEFOLD_CHARACTER cA3[256]=
+static const MY_CASEFOLD_CHARACTER cA3[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -556,7 +556,7 @@ static MY_CASEFOLD_CHARACTER cA3[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cA6[256]=
+static const MY_CASEFOLD_CHARACTER cA6[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -761,7 +761,7 @@ static MY_CASEFOLD_CHARACTER cA6[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cA7[256]=
+static const MY_CASEFOLD_CHARACTER cA7[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -966,7 +966,7 @@ static MY_CASEFOLD_CHARACTER cA7[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER *my_casefold_pages_gbk[256]=
+static const MY_CASEFOLD_CHARACTER *my_casefold_pages_gbk[256]=
 {
   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 0 */
   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
diff --git a/strings/ctype-mb.c b/strings/ctype-mb.c
index 88df11ca29e..88dd36312ea 100644
--- a/strings/ctype-mb.c
+++ b/strings/ctype-mb.c
@@ -63,10 +63,10 @@ size_t my_casedn_str_mb(CHARSET_INFO * cs, char *str)
 }
 
 
-static inline MY_CASEFOLD_CHARACTER*
+static inline const MY_CASEFOLD_CHARACTER*
 get_case_info_for_ch(CHARSET_INFO *cs, uint page, uint offs)
 {
-  MY_CASEFOLD_CHARACTER *p;
+  const MY_CASEFOLD_CHARACTER *p;
   return cs->casefold && (p= cs->casefold->page[page]) ? &p[offs] : NULL;
 }
 
@@ -97,7 +97,7 @@ my_casefold_mb(CHARSET_INFO *cs,
     size_t mblen= my_ismbchar(cs, src, srcend);
     if (mblen)
     {
-      MY_CASEFOLD_CHARACTER *ch;
+      const MY_CASEFOLD_CHARACTER *ch;
       if ((ch= get_case_info_for_ch(cs, (uchar) src[0], (uchar) src[1])))
       {
         int code= is_upper ? ch->toupper : ch->tolower;
diff --git a/strings/ctype-sjis.c b/strings/ctype-sjis.c
index 5378601e07f..1e3ef16bdb5 100644
--- a/strings/ctype-sjis.c
+++ b/strings/ctype-sjis.c
@@ -198,7 +198,7 @@ static const uchar sort_order_sjis[]=
 #define sjiscode(c,d)	((((uint) (uchar)(c)) << 8) | (uint) (uchar) (d))
 
 
-static MY_CASEFOLD_CHARACTER c81[256]=
+static const MY_CASEFOLD_CHARACTER c81[256]=
 {
   /* 8100-810F */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -408,7 +408,7 @@ static MY_CASEFOLD_CHARACTER c81[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER c82[256]=
+static const MY_CASEFOLD_CHARACTER c82[256]=
 {
   /* 8200-820F */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -616,7 +616,7 @@ static MY_CASEFOLD_CHARACTER c82[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER c83[256]=
+static const MY_CASEFOLD_CHARACTER c83[256]=
 {
   /* 8300-830F */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -826,7 +826,7 @@ static MY_CASEFOLD_CHARACTER c83[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER c84[256]=
+static const MY_CASEFOLD_CHARACTER c84[256]=
 {
   /* 8400-840F */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -1036,7 +1036,7 @@ static MY_CASEFOLD_CHARACTER c84[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER *my_casefold_pages_sjis[256]=
+static const MY_CASEFOLD_CHARACTER *my_casefold_pages_sjis[256]=
 {
   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 0 */
   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
diff --git a/strings/ctype-ujis.c b/strings/ctype-ujis.c
index 58be36f3040..76f000e9ed6 100644
--- a/strings/ctype-ujis.c
+++ b/strings/ctype-ujis.c
@@ -65976,7 +65976,7 @@ my_wc_mb_euc_jp(CHARSET_INFO *cs __attribute__((unused)),
 
 
 /* Case info pages for JIS-X-0208 range */
-static MY_CASEFOLD_CHARACTER cA2[256]=
+static const MY_CASEFOLD_CHARACTER cA2[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -66097,7 +66097,7 @@ static MY_CASEFOLD_CHARACTER cA2[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cA3[256]=
+static const MY_CASEFOLD_CHARACTER cA3[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -66218,7 +66218,7 @@ static MY_CASEFOLD_CHARACTER cA3[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cA6[256]=
+static const MY_CASEFOLD_CHARACTER cA6[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -66339,7 +66339,7 @@ static MY_CASEFOLD_CHARACTER cA6[256]=
 };
 
 
-static MY_CASEFOLD_CHARACTER cA7[256]=
+static const MY_CASEFOLD_CHARACTER cA7[256]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -66461,7 +66461,7 @@ static MY_CASEFOLD_CHARACTER cA7[256]=
 
 
 /* Case info pages for JIS-X-0212 range */
-static MY_CASEFOLD_CHARACTER c8FA6[]=
+static const MY_CASEFOLD_CHARACTER c8FA6[]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -66582,7 +66582,7 @@ static MY_CASEFOLD_CHARACTER c8FA6[]=
 };
 
 
-static MY_CASEFOLD_CHARACTER c8FA7[]=
+static const MY_CASEFOLD_CHARACTER c8FA7[]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -66703,7 +66703,7 @@ static MY_CASEFOLD_CHARACTER c8FA7[]=
 };
 
 
-static MY_CASEFOLD_CHARACTER c8FA9[]=
+static const MY_CASEFOLD_CHARACTER c8FA9[]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -66824,7 +66824,7 @@ static MY_CASEFOLD_CHARACTER c8FA9[]=
 };
 
 
-static MY_CASEFOLD_CHARACTER c8FAA[]=
+static const MY_CASEFOLD_CHARACTER c8FAA[]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -66945,7 +66945,7 @@ static MY_CASEFOLD_CHARACTER c8FAA[]=
 };
 
 
-static MY_CASEFOLD_CHARACTER c8FAB[]=
+static const MY_CASEFOLD_CHARACTER c8FAB[]=
 {
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, /* xx00 */
   {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
@@ -67066,7 +67066,7 @@ static MY_CASEFOLD_CHARACTER c8FAB[]=
 };
 
 
-static MY_CASEFOLD_CHARACTER *my_casefold_pages_ujis[512]=
+static const MY_CASEFOLD_CHARACTER *my_casefold_pages_ujis[512]=
 {
   /* JIS-X-0208 */
   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 0 */
@@ -67155,10 +67155,10 @@ static MY_CASEFOLD_INFO my_casefold_info_ujis=
   UJIS and EUCJPMS share the same UPPER/LOWER functions.
 */
 
-static MY_CASEFOLD_CHARACTER*
+static const MY_CASEFOLD_CHARACTER*
 get_case_info_for_ch(CHARSET_INFO *cs, uint plane, uint page, uint offs)
 {
-  MY_CASEFOLD_CHARACTER *p;
+  const MY_CASEFOLD_CHARACTER *p;
   return (p= cs->casefold->page[page + plane * 256]) ? &p[offs & 0xFF] : NULL;
 }
 
@@ -67180,7 +67180,7 @@ my_casefold_ujis(CHARSET_INFO *cs,
     size_t mblen= my_ismbchar(cs, src, srcend);
     if (mblen)
     {
-      MY_CASEFOLD_CHARACTER *ch;
+      const MY_CASEFOLD_CHARACTER *ch;
       ch= (mblen == 2) ?
         get_case_info_for_ch(cs, 0, (uchar) src[0], (uchar) src[1]) :
         get_case_info_for_ch(cs, 1, (uchar) src[1], (uchar) src[2]);