New CRC32() SQL function

sql/item_create.cc

@@ -86,6 +86,11 @@ Item *create_func_cot(Item* a)
 			   new Item_func_tan(a));
 }
 
+Item *create_func_crc32(Item* a)
+{
+  return new Item_func_crc32(a);
+}
+
 Item *create_func_date_format(Item* a,Item *b)
 {
   return new Item_func_date_format(a,b,0);

sql/item_create.h

@@ -29,6 +29,7 @@ Item *create_func_connection_id(void);
 Item *create_func_conv(Item* a, Item *b, Item *c);
 Item *create_func_cos(Item* a);
 Item *create_func_cot(Item* a);
+Item *create_func_crc32(Item* a);
 Item *create_func_date_format(Item* a,Item *b);
 Item *create_func_dayname(Item* a);
 Item *create_func_dayofmonth(Item* a);

sql/item_func.cc

@@ -26,6 +26,7 @@
 #include <hash.h>
 #include <time.h>
 #include <ft_global.h>
+#include <zlib.h>
 #include "slave.h" // for wait_for_master_pos
 #include "gstream.h"
 
@@ -801,6 +802,18 @@ longlong Item_func_min_max::val_int()
   return value;
 }
 
+longlong Item_func_crc32::val_int()
+{
+  String *res=args[0]->val_str(&value);
+  if (!res)
+  {
+    null_value=1;
+    return 0; /* purecov: inspected */
+  }
+  null_value=0;
+  return (longlong) crc32(0L, (Bytef*)res->ptr(), res->length());
+}
+
 
 longlong Item_func_length::val_int()
 {

sql/item_func.h

@@ -518,6 +518,16 @@ class Item_func_max :public Item_func_min_max
   const char *func_name() const { return "greatest"; }
 };
 
+class Item_func_crc32 :public Item_int_func
+{
+  String value;
+public:
+  Item_func_crc32(Item *a) :Item_int_func(a) {}
+  longlong val_int();
+  const char *func_name() const { return "crc32"; }
+  void fix_length_and_dec() { max_length=10; }
+};
+
 
 class Item_func_length :public Item_int_func
 {

sql/lex.h

@@ -430,6 +430,7 @@ static SYMBOL sql_functions[] = {
   { "COUNT",		SYM(COUNT_SYM),0,0},
   { "COS",		SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_cos)},
   { "COT",		SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_cot)},
+  { "CRC32",		SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_crc32)},
   { "CROSSES",		SYM(FUNC_ARG2),0,CREATE_FUNC(create_func_crosses)},
   { "CURDATE",		SYM(CURDATE),0,0},
   { "CURTIME",		SYM(CURTIME),0,0},