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Implementation of the last review comments for WL#1724

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"Min/Max Optimization for Queries with Group By Clause"
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timour@mysql.com
2004-09-10 04:45:15 +03:00
parent e2cd3dd1ce
commit e76e617e01
8 changed files with 444 additions and 479 deletions
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6
mysql-test/r/group_min_max.result
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@@ -1869,6 +1869,12 @@ id select_type table type possible_keys key key_len ref rows Extra
explain select a1,a2,b from t1 where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') and (c > 'a111') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 76 Using where; Using index
explain select a1,a2,min(b),c from t2 where (a2 = 'a') and (c = 'a111') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 164 Using where; Using index
select a1,a2,min(b),c from t2 where (a2 = 'a') and (c = 'a111') group by a1;
a1 a2 min(b) c
a a a a111
explain select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b = 'b') or (b = 'a') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 164 Using where; Using index

16
mysql-test/t/group_min_max.test
View File

@@ -3,6 +3,12 @@
# The queries in this file test query execution via QUICK_GROUP_MIN_MAX_SELECT.
#
#
# TODO:
# Add queries with:
# - C != const
# - C IS NOT NULL
# - HAVING clause
--disable_warnings
drop table if exists t1;
@@ -175,8 +181,6 @@ explain select a1, b, min(c), a1, max(c), b, a2, max(c), max(c) from t1 group by
explain select min(a2) from t1 group by a1;
explain select a2, min(c), max(c) from t1 group by a1,a2,b;
-- TODO: Queries with HAVING
-- queries
select a1, min(a2) from t1 group by a1;
select a1, max(a2) from t1 group by a1;
@@ -190,8 +194,6 @@ select a1, b, min(c), a1, max(c), b, a2, max(c), max(c) from t1 group by a1, a2,
select min(a2) from t1 group by a1;
select a2, min(c), max(c) from t1 group by a1,a2,b;
-- TODO: Queries with HAVING
--
-- Queries with a where clause
--
@@ -300,7 +302,6 @@ select a1,a2,b,min(c) from t2 where b is NULL group by a1,a2;
select a1,a2,b,max(c) from t2 where b is NULL group by a1,a2;
select a1,a2,b,min(c),max(c) from t2 where b is NULL group by a1,a2;
select a1,a2,b,min(c),max(c) from t2 where b is NULL group by a1,a2;
-- TODO: IS NOT NULL ?
-- C) Range predicates for the MIN/MAX attribute
-- plans
@@ -553,6 +554,11 @@ where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') and (d > 'xy
explain select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b = 'b') or (b < 'b') group by a1;
explain select a1,a2,b from t1 where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') and (c > 'a111') group by a1,a2,b;
-- non-group field with an equality predicate that references a keypart after the
-- MIN/MAX argument
explain select a1,a2,min(b),c from t2 where (a2 = 'a') and (c = 'a111') group by a1;
select a1,a2,min(b),c from t2 where (a2 = 'a') and (c = 'a111') group by a1;
-- disjunction for a non-group select attribute
explain select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b = 'b') or (b = 'a') group by a1;