A test case for Bug#14845 "mysql_stmt_fetch returns MYSQL_NO_DATA

when COUNT(*) is 0". The bug itself cannot be repeated.


mysql-test/r/sp.result:
  Test results were fixed (Bug#14845)
mysql-test/t/sp.test:
  An SQL language test case for Bug#14845
tests/mysql_client_test.c:
  A test case for Bug#14845

mysql-test/r/sp.result

@@ -3648,4 +3648,23 @@ call bug14723();;
 42
 drop function bug14723|
 drop procedure bug14723|
+create procedure bug14845()
+begin
+declare a char(255);
+declare done int default 0;
+declare c cursor for select count(*) from t1 where 1 = 0;
+declare continue handler for sqlstate '02000' set done = 1;
+open c;
+repeat
+fetch c into a;
+if not done then
+select a;
+end if;
+until done end repeat;
+close c;
+end|
+call bug14845()|
+a
+0
+drop procedure bug14845|
 drop table t1,t2;

mysql-test/t/sp.test

@@ -4572,6 +4572,27 @@ delimiter |;;
 drop function bug14723|
 drop procedure bug14723|
 
+#
+# Bug#14845 "mysql_stmt_fetch returns MYSQL_NO_DATA when COUNT(*) is 0"
+# Check that when fetching from a cursor, COUNT(*) works properly.
+#
+create procedure bug14845()
+begin
+  declare a char(255);
+  declare done int default 0;
+  declare c cursor for select count(*) from t1 where 1 = 0;
+  declare continue handler for sqlstate '02000' set done = 1;
+  open c;
+  repeat
+    fetch c into a;
+    if not done then
+      select a;
+    end if;
+  until done end repeat;
+  close c;
+end|
+call bug14845()|
+drop procedure bug14845|
 
 #
 # BUG#NNNN: New bug synopsis

tests/mysql_client_test.c

@@ -14546,6 +14546,49 @@ static void test_bug13524()
   myquery(rc);
 }
 
+/*
+  Bug#14845 "mysql_stmt_fetch returns MYSQL_NO_DATA when COUNT(*) is 0"
+*/
+
+static void test_bug14845()
+{
+  MYSQL_STMT *stmt;
+  int rc;
+  const ulong type= CURSOR_TYPE_READ_ONLY;
+  const char *query= "select count(*) from t1 where 1 = 0";
+
+  myheader("test_bug14845");
+
+  rc= mysql_query(mysql, "drop table if exists t1");
+  myquery(rc);
+  rc= mysql_query(mysql, "create table t1 (id int(11) default null, "
+                         "name varchar(20) default null)"
+                         "engine=MyISAM DEFAULT CHARSET=utf8");
+  myquery(rc);
+  rc= mysql_query(mysql, "insert into t1 values (1,'abc'),(2,'def')");
+  myquery(rc);
+
+  stmt= mysql_stmt_init(mysql);
+  rc= mysql_stmt_attr_set(stmt, STMT_ATTR_CURSOR_TYPE, (const void*) &type);
+  check_execute(stmt, rc);
+
+  rc= mysql_stmt_prepare(stmt, query, strlen(query));
+  check_execute(stmt, rc);
+
+  rc= mysql_stmt_execute(stmt);
+  check_execute(stmt, rc);
+
+  rc= mysql_stmt_fetch(stmt);
+  DIE_UNLESS(rc == 0);
+
+  rc= mysql_stmt_fetch(stmt);
+  DIE_UNLESS(rc == MYSQL_NO_DATA);
+
+  /* Cleanup */
+  mysql_stmt_close(stmt);
+  rc= mysql_query(mysql, "drop table t1");
+  myquery(rc);
+}
 
 /*
   Read and parse arguments and MySQL options from my.cnf
@@ -14805,6 +14848,7 @@ static struct my_tests_st my_tests[]= {
   { "test_bug14210", test_bug14210 },
   { "test_bug13488", test_bug13488 },
   { "test_bug13524", test_bug13524 },
+  { "test_bug14845", test_bug14845 },
   { 0, 0 }
 };