Change of internal key_field=NULL handling to avoid error messages.

Optimized SELECT DISTINCT ... ORDER BY ... LIMIT
Fixed reference to uninitalized variable


mysql-test/r/distinct.result:
  Updated results for new tests
mysql-test/r/func_math.result:
  Fixed test of RND()
mysql-test/r/innodb.result:
  Updated results for new tests
mysql-test/r/null.result:
  Updated results for new tests
mysql-test/t/distinct.test:
  New distinct test
mysql-test/t/func_math.test:
  Fixed test of RND()
mysql-test/t/innodb.test:
  Test for bugs
mysql-test/t/null.test:
  TEst for bugs
sql/field.h:
  Change of NULL handling to avoid error messages
sql/field_conv.cc:
  Change of NULL handling to avoid error messages
sql/item.cc:
  Change of NULL handling to avoid error messages
sql/item.h:
  Change of NULL handling to avoid error messages
sql/item_cmpfunc.cc:
  Change of NULL handling to avoid error messages
sql/item_func.cc:
  Change of NULL handling to avoid error messages
sql/item_func.h:
  Cleaned up RND() handling
sql/item_timefunc.cc:
  Change of NULL handling to avoid error messages
sql/item_timefunc.h:
  Change of NULL handling to avoid error messages
sql/opt_range.cc:
  Fixed bug in <=> NULL
sql/password.c:
  Indentation cleanup
sql/sql_base.cc:
  Change of NULL handling to avoid error messages
sql/sql_class.cc:
  Fixed reference to uninitalized variable
sql/sql_handler.cc:
  Change of NULL handling to avoid error messages
sql/sql_select.cc:
  Change of NULL handling to avoid error messages
  Optimized SELECT DISTINCT ... ORDER BY ... LIMIT
sql/sql_select.h:
  Change of NULL handling to avoid error messages
sql/unireg.cc:
  Change of NULL handling to avoid error messages

1 files changed, 10 insertions, 0 deletions

diff --git a/mysql-test/t/distinct.test b/mysql-test/t/distinct.test
index aaffea3c5a5..7f75b6b1687 100644
--- a/mysql-test/t/distinct.test
+++ b/mysql-test/t/distinct.test
@@ -88,6 +88,16 @@ select distinct t1.a from t1,t3 where t1.a=t3.a;
 #flush status;
 select distinct 1 from t1,t3 where t1.a=t3.a;
 #show status like 'Handler%';
+
+explain SELECT distinct t1.a from t1;
+explain SELECT distinct t1.a from t1 order by a desc;
+explain SELECT t1.a from t1 group by a order by a desc;
+explain SELECT distinct t1.a from t1 order by a desc limit 1;
+explain SELECT distinct a from t3 order by a desc limit 2;
+explain SELECT distinct a,b from t3 order by a+1;
+explain SELECT distinct a,b from t3 order by a limit 10;
+explain SELECT a,b from t3 group by a,b order by a+1;
+
 drop table t1,t2,t3,t4;
 
 CREATE TABLE t1 (name varchar(255));