LOAD_FILE() is now COERCIBLE

LOAD_FILE() tests

mysql-test/r/type_blob.result

@@ -486,8 +486,19 @@ fish	10
 drop table t1;
 create table t1 (id integer auto_increment unique,imagem LONGBLOB not null);
 insert into t1 (id) values (1);
+select 
+charset(load_file('../../std_data/words.dat')),
+collation(load_file('../../std_data/words.dat')),
+coercibility(load_file('../../std_data/words.dat'));
+charset(load_file('../../std_data/words.dat'))	collation(load_file('../../std_data/words.dat'))	coercibility(load_file('../../std_data/words.dat'))
+binary	binary	3
 update t1 set imagem=load_file('../../std_data/words.dat') where id=1;
 select if(imagem is null, "ERROR", "OK"),length(imagem) from t1 where id = 1;
 if(imagem is null, "ERROR", "OK")	length(imagem)
 OK	581
 drop table t1;
+create table t1 select load_file('../../std_data/words.dat');
+show full fields from t1;
+Field	Type	Collation	Null	Key	Default	Extra	Privileges	Comment
+load_file('../../std_data/words.dat')	mediumblob	NULL	YES		NULL		select,insert,update,references	
+drop table t1;

mysql-test/t/type_blob.test

@@ -294,6 +294,13 @@ drop table t1;
 
 create table t1 (id integer auto_increment unique,imagem LONGBLOB not null);
 insert into t1 (id) values (1);
+select 
+  charset(load_file('../../std_data/words.dat')),
+  collation(load_file('../../std_data/words.dat')),
+  coercibility(load_file('../../std_data/words.dat'));
 update t1 set imagem=load_file('../../std_data/words.dat') where id=1;
 select if(imagem is null, "ERROR", "OK"),length(imagem) from t1 where id = 1;
 drop table t1;
+create table t1 select load_file('../../std_data/words.dat');
+show full fields from t1;
+drop table t1;

sql/item_strfunc.h

@@ -536,8 +536,8 @@ public:
   const char *func_name() const { return "load_file"; }
   void fix_length_and_dec()
   { 
-    set_charset(&my_charset_bin);
-    maybe_null=1; 
+    set_charset(&my_charset_bin, COER_COERCIBLE);
+    maybe_null=1;
     max_length=MAX_BLOB_WIDTH;
   }
 };