Merge to get make String reallocation faster

mysql-test/suite/maria/r/compat_aliases.result

 select * from information_schema.plugins where plugin_name like '%aria';
 PLUGIN_NAME	PLUGIN_VERSION	PLUGIN_STATUS	PLUGIN_TYPE	PLUGIN_TYPE_VERSION	PLUGIN_LIBRARY	PLUGIN_LIBRARY_VERSION	PLUGIN_AUTHOR	PLUGIN_DESCRIPTION	PLUGIN_LICENSE	PLUGIN_MATURITY	PLUGIN_AUTH_VERSION
-Maria	1.5	ACTIVE	DAEMON	50300.0	NULL	NULL	Monty Program Ab	Compatibility aliases for the Aria engine	GPL	Gamma	1.5
-Aria	1.5	ACTIVE	STORAGE ENGINE	50300.0	NULL	NULL	Monty Program Ab	Crash-safe tables with MyISAM heritage	GPL	Gamma	1.5
+Maria	1.5	ACTIVE	DAEMON	#	NULL	NULL	Monty Program Ab	Compatibility aliases for the Aria engine	GPL	Gamma	1.5
+Aria	1.5	ACTIVE	STORAGE ENGINE	#	NULL	NULL	Monty Program Ab	Crash-safe tables with MyISAM heritage	GPL	Gamma	1.5
 select maria_vars.variable_name, aria_vars.variable_name from
 information_schema.session_variables as maria_vars left join
 information_schema.session_variables as aria_vars

mysql-test/suite/maria/t/compat_aliases.test

@@ -3,6 +3,7 @@
 #  command-line options). They should match aria* variables.
 #
 
+--replace_column 5 #
 select * from information_schema.plugins where plugin_name like '%aria';
 
 select maria_vars.variable_name, aria_vars.variable_name from

mysys/safemalloc.c

@@ -224,6 +224,8 @@ void *_myrealloc(register void *ptr, register size_t size,
   struct st_irem *irem;
   char *data;
   DBUG_ENTER("_myrealloc");
+  DBUG_PRINT("my",("ptr: 0x%lx  size: %lu  my_flags: %d", (long) ptr,
+                   (ulong) size, MyFlags));
 
   if (!ptr && (MyFlags & MY_ALLOW_ZERO_PTR))
     DBUG_RETURN(_mymalloc(size, filename, lineno, MyFlags));
@@ -245,6 +247,8 @@ void *_myrealloc(register void *ptr, register size_t size,
     (void) fflush(stderr);
     DBUG_RETURN((uchar*) NULL);
   }
+  DBUG_PRINT("my", ("old_size: %lu  -> new_size: %lu",
+                    (ulong) irem->datasize, (ulong) size));
 
   if ((data= _mymalloc(size,filename,lineno,MyFlags))) /* Allocate new area */
   {

sql/net_serv.cc

@@ -116,7 +116,7 @@ my_bool my_net_init(NET *net, Vio* vio)
   net->vio = vio;
   my_net_local_init(net);			/* Set some limits */
   if (!(net->buff=(uchar*) my_malloc((size_t) net->max_packet+
-				     NET_HEADER_SIZE + COMP_HEADER_SIZE,
+				     NET_HEADER_SIZE + COMP_HEADER_SIZE +1,
 				     MYF(MY_WME))))
     DBUG_RETURN(1);
   net->buff_end=net->buff+net->max_packet;
@@ -580,7 +580,7 @@ net_real_write(NET *net,const uchar *packet, size_t len)
     uchar *b;
     uint header_length=NET_HEADER_SIZE+COMP_HEADER_SIZE;
     if (!(b= (uchar*) my_malloc(len + NET_HEADER_SIZE +
-                                COMP_HEADER_SIZE, MYF(MY_WME))))
+                                COMP_HEADER_SIZE + 1, MYF(MY_WME))))
     {
       net->error= 2;
       net->last_errno= ER_OUT_OF_RESOURCES;

sql/protocol.cc

@@ -632,6 +632,9 @@ bool Protocol::send_fields(List<Item> *list, uint flags)
   uint count= 0;
 #endif
 
+  /* We have to reallocate it here as a stored procedure may have reset it */
+  (void) local_packet->alloc(thd->variables.net_buffer_length);
+
   while ((item=it++))
   {
     char *pos;

sql/sp.cc

@@ -785,7 +785,7 @@ db_load_routine(THD *thd, int type, sp_name *name, sp_head **sphp,
 
   {
     Parser_state parser_state;
-    if (parser_state.init(thd, defstr.c_ptr(), defstr.length()))
+    if (parser_state.init(thd, defstr.c_ptr_safe(), defstr.length()))
     {
       ret= SP_INTERNAL_ERROR;
       goto end;

sql/sql_select.cc

@@ -17497,6 +17497,7 @@ change_to_use_tmp_fields(THD *thd, Item **ref_pointer_array,
 	  char buff[256];
 	  String str(buff,sizeof(buff),&my_charset_bin);
 	  str.length(0);
+          str.extra_allocation(1024);
 	  item->print(&str, QT_ORDINARY);
 	  item_field->name= sql_strmake(str.ptr(),str.length());
 	}

sql/sql_show.cc

@@ -4330,7 +4330,7 @@ static int get_schema_column_record(THD *thd, TABLE_LIST *tables,
       base_type [(dimension)] [unsigned] [zerofill].
       For DATA_TYPE column we extract only base type.
     */
-    tmp_buff= strchr(type.ptr(), '(');
+    tmp_buff= strchr(type.c_ptr_safe(), '(');
     if (!tmp_buff)
       /*
         if there is no dimention part then check the presence of

sql/sql_string.cc

@@ -411,7 +411,7 @@ bool String::append(const String &s)
 {
   if (s.length())
   {
-    if (realloc(str_length+s.length()))
+    if (realloc_with_extra_if_needed(str_length+s.length()))
       return TRUE;
     memcpy(Ptr+str_length,s.ptr(),s.length());
     str_length+=s.length();
@@ -436,7 +436,7 @@ bool String::append(const char *s,uint32 arg_length)
   {
     uint32 add_length=arg_length * str_charset->mbmaxlen;
     uint dummy_errors;
-    if (realloc(str_length+ add_length))
+    if (realloc_with_extra_if_needed(str_length+ add_length))
       return TRUE;
     str_length+= copy_and_convert(Ptr+str_length, add_length, str_charset,
 				  s, arg_length, &my_charset_latin1,
@@ -447,7 +447,7 @@ bool String::append(const char *s,uint32 arg_length)
   /*
     For an ASCII compatinble string we can just append.
   */
-  if (realloc(str_length+arg_length))
+  if (realloc_with_extra_if_needed(str_length+arg_length))
     return TRUE;
   memcpy(Ptr+str_length,s,arg_length);
   str_length+=arg_length;
@@ -478,14 +478,14 @@ bool String::append(const char *s,uint32 arg_length, CHARSET_INFO *cs)
   {
     uint32 add_length= arg_length / cs->mbminlen * str_charset->mbmaxlen;
     uint dummy_errors;
-    if (realloc(str_length + add_length)) 
+    if (realloc_with_extra_if_needed(str_length + add_length)) 
       return TRUE;
     str_length+= copy_and_convert(Ptr+str_length, add_length, str_charset,
 				  s, arg_length, cs, &dummy_errors);
   }
   else
   {
-    if (realloc(str_length + arg_length)) 
+    if (realloc_with_extra_if_needed(str_length + arg_length)) 
       return TRUE;
     memcpy(Ptr + str_length, s, arg_length);
     str_length+= arg_length;
@@ -497,7 +497,7 @@ bool String::append(const char *s,uint32 arg_length, CHARSET_INFO *cs)
 #ifdef TO_BE_REMOVED
 bool String::append(FILE* file, uint32 arg_length, myf my_flags)
 {
-  if (realloc(str_length+arg_length))
+  if (realloc_with_extra_if_needed(str_length+arg_length))
     return TRUE;
   if (my_fread(file, (uchar*) Ptr + str_length, arg_length, my_flags))
   {
@@ -511,7 +511,7 @@ bool String::append(FILE* file, uint32 arg_length, myf my_flags)
 
 bool String::append(IO_CACHE* file, uint32 arg_length)
 {
-  if (realloc(str_length+arg_length))
+  if (realloc_with_extra_if_needed(str_length+arg_length))
     return TRUE;
   if (my_b_read(file, (uchar*) Ptr + str_length, arg_length))
   {
@@ -527,7 +527,7 @@ bool String::append_with_prefill(const char *s,uint32 arg_length,
 {
   int t_length= arg_length > full_length ? arg_length : full_length;
 
-  if (realloc(str_length + t_length))
+  if (realloc_with_extra_if_needed(str_length + t_length))
     return TRUE;
   t_length= full_length - arg_length;
   if (t_length > 0)
@@ -636,7 +636,7 @@ bool String::replace(uint32 offset,uint32 arg_length,
     {
       if (diff)
       {
-	if (realloc(str_length+(uint32) diff))
+	if (realloc_with_extra_if_needed(str_length+(uint32) diff))
 	  return TRUE;
 	bmove_upp((uchar*) Ptr+str_length+diff, (uchar*) Ptr+str_length,
 		  str_length-offset-arg_length);

sql/sql_string.h

@@ -53,23 +53,24 @@ uint convert_to_printable(char *to, size_t to_len,
 class String
 {
   char *Ptr;
-  uint32 str_length,Alloced_length;
+  uint32 str_length,Alloced_length, extra_alloc;
   bool alloced;
   CHARSET_INFO *str_charset;
 public:
   String()
   { 
-    Ptr=0; str_length=Alloced_length=0; alloced=0; 
+    Ptr=0; str_length=Alloced_length=extra_alloc=0; alloced=0; 
     str_charset= &my_charset_bin; 
   }
   String(uint32 length_arg)
   { 
-    alloced=0; Alloced_length=0; (void) real_alloc(length_arg); 
+    alloced=0; Alloced_length= extra_alloc= 0; (void) real_alloc(length_arg); 
     str_charset= &my_charset_bin;
   }
   String(const char *str, CHARSET_INFO *cs)
   { 
-    Ptr=(char*) str; str_length=(uint) strlen(str); Alloced_length=0; alloced=0;
+    Ptr=(char*) str; str_length= (uint32) strlen(str);
+    Alloced_length= extra_alloc= 0; alloced=0;
     str_charset=cs;
   }
   /*
@@ -79,18 +80,18 @@ class String
   */
   String(const char *str,uint32 len, CHARSET_INFO *cs)
   { 
-    Ptr=(char*) str; str_length=len; Alloced_length=0; alloced=0;
+    Ptr=(char*) str; str_length=len; Alloced_length= extra_alloc=0; alloced=0;
     str_charset=cs;
   }
   String(char *str,uint32 len, CHARSET_INFO *cs)
   { 
-    Ptr=(char*) str; Alloced_length=str_length=len; alloced=0;
+    Ptr=(char*) str; Alloced_length=str_length=len; extra_alloc= 0; alloced=0;
     str_charset=cs;
   }
   String(const String &str)
   { 
     Ptr=str.Ptr ; str_length=str.str_length ;
-    Alloced_length=str.Alloced_length; alloced=0; 
+    Alloced_length=str.Alloced_length; extra_alloc= 0; alloced=0; 
     str_charset=str.str_charset;
   }
   static void *operator new(size_t size, MEM_ROOT *mem_root) throw ()
@@ -106,8 +107,10 @@ class String
   inline CHARSET_INFO *charset() const { return str_charset; }
   inline uint32 length() const { return str_length;}
   inline uint32 alloced_length() const { return Alloced_length;}
+  inline uint32 extra_allocation() const { return extra_alloc;}
   inline char& operator [] (uint32 i) const { return Ptr[i]; }
   inline void length(uint32 len) { str_length=len ; }
+  inline void extra_allocation(uint32 len) { extra_alloc= len; }
   inline bool is_empty() const { return (str_length == 0); }
   inline void mark_as_const() { Alloced_length= 0;}
   inline const char *ptr() const { return Ptr; }
@@ -136,23 +139,21 @@ class String
   {
     DBUG_ASSERT(&str != this);
     free();
-    Ptr=(char*) str.ptr()+offset; str_length=arg_length; alloced=0;
+    Ptr=(char*) str.ptr()+offset; str_length=arg_length;
     if (str.Alloced_length)
       Alloced_length=str.Alloced_length-offset;
-    else
-      Alloced_length=0;
     str_charset=str.str_charset;
   }
   inline void set(char *str,uint32 arg_length, CHARSET_INFO *cs)
   {
     free();
-    Ptr=(char*) str; str_length=Alloced_length=arg_length ; alloced=0;
+    Ptr=(char*) str; str_length=Alloced_length=arg_length;
     str_charset=cs;
   }
   inline void set(const char *str,uint32 arg_length, CHARSET_INFO *cs)
   {
     free();
-    Ptr=(char*) str; str_length=arg_length; Alloced_length=0 ; alloced=0;
+    Ptr=(char*) str; str_length=arg_length;
     str_charset=cs;
   }
   bool set_ascii(const char *str, uint32 arg_length);
@@ -203,11 +204,11 @@ class String
     if (alloced)
     {
       alloced=0;
-      Alloced_length=0;
       my_free(Ptr,MYF(0));
-      Ptr=0;
-      str_length=0;				/* Safety */
     }
+    Alloced_length= extra_alloc= 0;
+    Ptr=0;
+    str_length=0;				/* Safety */
   }
   inline bool alloc(uint32 arg_length)
   {
@@ -217,9 +218,21 @@ class String
   }
   bool real_alloc(uint32 arg_length);			// Empties old string
   bool realloc(uint32 arg_length);
-  inline void shrink(uint32 arg_length)		// Shrink buffer
+  bool realloc_with_extra(uint32 arg_length)
+  {
+    if (extra_alloc < 4096)
+      extra_alloc= extra_alloc*2+128;
+    return realloc(arg_length + extra_alloc);
+  }
+  bool realloc_with_extra_if_needed(uint32 arg_length)
   {
     if (arg_length < Alloced_length)
+      return 0;
+    return realloc_with_extra(arg_length);
+  }
+  inline void shrink(uint32 arg_length)		// Shrink buffer
+  {
+    if (ALIGN_SIZE(arg_length+1) < Alloced_length)
     {
       char *new_ptr;
       if (!(new_ptr=(char*) my_realloc(Ptr,arg_length,MYF(0))))
@@ -246,7 +259,6 @@ class String
       DBUG_ASSERT(!s.uses_buffer_owned_by(this));
       free();
       Ptr=s.Ptr ; str_length=s.str_length ; Alloced_length=s.Alloced_length;
-      alloced=0;
     }
     return *this;
   }
@@ -281,7 +293,7 @@ class String
     }
     else
     {
-      if (realloc(str_length+1))
+      if (realloc_with_extra(str_length + 1))
 	return 1;
       Ptr[str_length++]=chr;
     }

sql/sql_test.cc

@@ -57,9 +57,10 @@ print_where(COND *cond,const char *info, enum_query_type query_type)
 {
   if (cond)
   {
-    char buff[256];
+    char buff[1024];
     String str(buff,(uint32) sizeof(buff), system_charset_info);
     str.length(0);
+    str.extra_allocation(1024);
     cond->print(&str, query_type);
     str.append('\0');
     DBUG_LOCK_FILE;

sql/table.cc

@@ -3320,11 +3320,13 @@ Table_check_intact::check(TABLE *table, const TABLE_FIELD_DEF *table_def)
       is backward compatible.
     */
   }
-  char buffer[STRING_BUFFER_USUAL_SIZE];
+  char buffer[1024];
   for (i=0 ; i < table_def->count; i++, field_def++)
   {
     String sql_type(buffer, sizeof(buffer), system_charset_info);
     sql_type.length(0);
+    /* Allocate min 256 characters at once */
+    sql_type.extra_allocation(256);
     if (i < table->s->fields)
     {
       Field *field= table->field[i];