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Code Activity

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

Browse Source 
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
This commit is contained in:
unknown
2002-12-03 13:08:25 +02:00
parent 4f221e351d
commit 80b143c111
25 changed files with 315 additions and 119 deletions
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24
mysql-test/r/distinct.result
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@ -198,6 +198,30 @@ a
select distinct 1 from t1,t3 where t1.a=t3.a;
1
1
explain SELECT distinct t1.a from t1;
table type possible_keys key key_len ref rows Extra
t1 index NULL PRIMARY 4 NULL 2 Using index
explain SELECT distinct t1.a from t1 order by a desc;
table type possible_keys key key_len ref rows Extra
t1 index NULL PRIMARY 4 NULL 2 Using index
explain SELECT t1.a from t1 group by a order by a desc;
table type possible_keys key key_len ref rows Extra
t1 index NULL PRIMARY 4 NULL 2 Using index
explain SELECT distinct t1.a from t1 order by a desc limit 1;
table type possible_keys key key_len ref rows Extra
t1 index NULL PRIMARY 4 NULL 2 Using index
explain SELECT distinct a from t3 order by a desc limit 2;
table type possible_keys key key_len ref rows Extra
t3 index NULL a 5 NULL 204 Using index
explain SELECT distinct a,b from t3 order by a+1;
table type possible_keys key key_len ref rows Extra
t3 ALL NULL NULL NULL NULL 204 Using temporary; Using filesort
explain SELECT distinct a,b from t3 order by a limit 10;
table type possible_keys key key_len ref rows Extra
t3 index NULL a 5 NULL 204 Using temporary
explain SELECT a,b from t3 group by a,b order by a+1;
table type possible_keys key key_len ref rows Extra
t3 ALL NULL NULL NULL NULL 204 Using temporary; Using filesort
drop table t1,t2,t3,t4;
CREATE TABLE t1 (name varchar(255));
INSERT INTO t1 VALUES ('aa'),('ab'),('ac'),('ad'),('ae');