Merge fix.

sql/sql_yacc.yy:
  Auto merged
tests/client_test.c:
  Merge fix (two new test cases at the same time).

mysql-test/r/auto_increment.result

@@ -142,7 +142,7 @@ explain extended select last_insert_id();
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select high_priority no_cache 255 AS `last_insert_id()`
+Note	1003	select high_priority no_cache last_insert_id() AS `last_insert_id()`
 insert into t1 set i = 254;
 ERROR 23000: Duplicate entry '254' for key 1
 select last_insert_id();

mysql-test/r/query_cache.result

@@ -292,7 +292,7 @@ DATABASE()
 select ENCRYPT("test") from t1;
 ENCRYPT("test")
 select LAST_INSERT_ID() from t1;
-last_insert_id()
+LAST_INSERT_ID()
 select RAND() from t1;
 RAND()
 select UNIX_TIMESTAMP() from t1;

mysql-test/r/variables.result

@@ -93,7 +93,7 @@ explain extended select @@IDENTITY,last_insert_id(), @@identity;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select high_priority no_cache 345 AS `@@IDENTITY`,345 AS `last_insert_id()`,345 AS `@@identity`
+Note	1003	select high_priority no_cache 345 AS `@@IDENTITY`,last_insert_id() AS `last_insert_id()`,345 AS `@@identity`
 set big_tables=OFF, big_tables=ON, big_tables=0, big_tables=1, big_tables="OFF", big_tables="ON";
 set global concurrent_insert=ON;
 show variables like 'concurrent_insert';

sql/item_func.cc

@@ -2139,13 +2139,22 @@ longlong Item_func_release_lock::val_int()
 }
 
 
-longlong Item_func_set_last_insert_id::val_int()
+longlong Item_func_last_insert_id::val_int()
 {
   DBUG_ASSERT(fixed == 1);
-  longlong value=args[0]->val_int();
-  current_thd->insert_id(value);
-  null_value=args[0]->null_value;
-  return value;
+  if (arg_count)
+  {
+    longlong value=args[0]->val_int();
+    current_thd->insert_id(value);
+    null_value=args[0]->null_value;
+    return value;
+  }
+  else
+  {
+    Item *it= get_system_var(current_thd, OPT_SESSION, "last_insert_id", 14,
+			     "last_insert_id()");
+    return it->val_int();
+  }
 }
 
 /* This function is just used to test speed of different functions */

sql/item_func.h

@@ -729,13 +729,14 @@ class Item_func_bit_neg :public Item_func_bit
 };
 
 
-class Item_func_set_last_insert_id :public Item_int_func
+class Item_func_last_insert_id :public Item_int_func
 {
 public:
-  Item_func_set_last_insert_id(Item *a) :Item_int_func(a) {}
+  Item_func_last_insert_id() :Item_int_func() {}
+  Item_func_last_insert_id(Item *a) :Item_int_func(a) {}
   longlong val_int();
   const char *func_name() const { return "last_insert_id"; }
-  void fix_length_and_dec() { max_length=args[0]->max_length; }
+  void fix_length_and_dec() { if (arg_count) max_length= args[0]->max_length; }
 };
 
 class Item_func_benchmark :public Item_int_func

sql/sql_yacc.yy

@@ -2750,13 +2750,12 @@ simple_expr:
           }
 	| LAST_INSERT_ID '(' ')'
 	  {
-	    $$= get_system_var(YYTHD, OPT_SESSION, "last_insert_id", 14,
-			      "last_insert_id()");
+	    $$= new Item_func_last_insert_id();
 	    Lex->safe_to_cache_query= 0;
 	  }
 	| LAST_INSERT_ID '(' expr ')'
 	  {
-	    $$= new Item_func_set_last_insert_id($3);
+	    $$= new Item_func_last_insert_id($3);
 	    Lex->safe_to_cache_query= 0;
 	  }
 	| LEFT '(' expr ',' expr ')'

tests/client_test.c

@@ -8432,6 +8432,68 @@ static void test_union()
   myquery(rc);
 }
 
+static void test_bug3117()
+{
+  MYSQL_STMT *stmt;
+  MYSQL_BIND buffer;
+  longlong lii;
+  ulong length;
+  my_bool is_null;
+  int rc;
+
+  myheader("test_bug3117");
+  
+  rc = mysql_query(mysql, "DROP TABLE IF EXISTS t1");
+  myquery(rc);
+  
+  rc= mysql_query(mysql,"CREATE TABLE t1 (id int auto_increment primary key)");
+  myquery(rc);
+
+  stmt = mysql_simple_prepare(mysql, "SELECT LAST_INSERT_ID()");
+  mystmt_init(stmt);
+
+  rc= mysql_query(mysql, "INSERT INTO t1 VALUES (NULL)");
+  myquery(rc);
+
+  rc = mysql_execute(stmt);
+  mystmt(stmt,rc);
+
+  buffer.buffer_type= MYSQL_TYPE_LONGLONG;
+  buffer.buffer_length= sizeof(lii);
+  buffer.buffer= (char *)&lii;
+  buffer.length= &length;
+  buffer.is_null= &is_null;
+
+  rc= mysql_bind_result(stmt, &buffer);
+  mystmt(stmt,rc);
+
+  rc= mysql_stmt_store_result(stmt);
+  mystmt(stmt,rc);
+
+  rc = mysql_fetch(stmt);
+  mystmt(stmt, rc);
+
+  assert(is_null == 0 && lii == 1);
+  fprintf(stdout, "\n\tLAST_INSERT_ID() = 1 ok\n");
+
+  rc= mysql_query(mysql, "INSERT INTO t1 VALUES (NULL)");
+  myquery(rc);
+
+  rc = mysql_execute(stmt);
+  mystmt(stmt,rc);
+
+  rc = mysql_fetch(stmt);
+  mystmt(stmt, rc);
+
+  assert(is_null == 0 && lii == 2);
+  fprintf(stdout, "\tLAST_INSERT_ID() = 2 ok\n");
+
+  mysql_stmt_close(stmt);
+
+  rc= mysql_query(mysql, "DROP TABLE t1");
+  myquery(rc);
+}
+
 /*
   Read and parse arguments and MySQL options from my.cnf
 */
@@ -8690,6 +8752,7 @@ int main(int argc, char **argv)
     test_subqueries_ref();  /* outer reference in subqueries converted
 			       Item_field -> Item_ref */
     test_union();	    /* test union with prepared statements */
+    test_bug3117();	    /* BUG#3117: LAST_INSERT_ID() */
 
     end_time= time((time_t *)0);
     total_time+= difftime(end_time, start_time);