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78b5e8d6ca
Due to this bug many queries that contained a window function with MIN/MAX aggregation returned wrong results. Calculation of a MIN/MAX aggregate function uses cache objects and a comparator object that are created and set up in Item_sum_hybrid::fix_fields () by a call of Item_sum_hybrid::setup_hybrid(). The latter binds the objects to the first argument of the MIN/MAX function. Meanwhile window function perform aggregation over fields of a temporary table. So binding must be done rather to these fields. The earliest moment when setup the objects used in MIN/max functions can be done is after all calls of the method split_sum_func(). This patch introduces this late setup, but only for aggregate functions used in window functions. Probably it makes sense to use this late setup for all MIN/MAX objects.
145 lines
2.9 KiB
Text
145 lines
2.9 KiB
Text
create table t1 (
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pk int primary key,
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a int,
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b int,
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c char(10),
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d decimal(10, 3),
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e real
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);
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insert into t1 values
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( 1, 0, 1, 'one', 0.1, 0.001),
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( 2, 0, 2, 'two', 0.2, 0.002),
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( 3, 0, 3, 'three', 0.3, 0.003),
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( 4, 1, 2, 'three', 0.4, 0.004),
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( 5, 1, 1, 'two', 0.5, 0.005),
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( 6, 1, 1, 'one', 0.6, 0.006),
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( 7, 2, NULL, 'n_one', 0.5, 0.007),
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( 8, 2, 1, 'n_two', NULL, 0.008),
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( 9, 2, 2, NULL, 0.7, 0.009),
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(10, 2, 0, 'n_four', 0.8, 0.010),
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(11, 2, 10, NULL, 0.9, NULL);
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select pk, row_number() over () from t1;
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pk row_number() over ()
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1 1
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2 2
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3 3
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4 4
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5 5
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6 6
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7 7
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8 8
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9 9
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10 10
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11 11
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explain FORMAT=JSON select pk, row_number() over () from t1;
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EXPLAIN
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{
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"query_block": {
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"select_id": 1,
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"window_functions_computation": {
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"sorts": {
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"filesort": {
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"sort_key": "pk"
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}
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},
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"temporary_table": {
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"table": {
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"table_name": "t1",
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"access_type": "index",
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"key": "PRIMARY",
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"key_length": "4",
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"used_key_parts": ["pk"],
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"rows": 11,
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"filtered": 100,
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"using_index": true
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}
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}
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}
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}
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}
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explain FORMAT=JSON select row_number() over (), pk from t1;
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EXPLAIN
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{
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"query_block": {
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"select_id": 1,
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"window_functions_computation": {
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"sorts": {
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"filesort": {
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"sort_key": "`row_number() over ()`"
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}
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},
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"temporary_table": {
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"table": {
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"table_name": "t1",
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"access_type": "index",
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"key": "PRIMARY",
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"key_length": "4",
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"used_key_parts": ["pk"],
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"rows": 11,
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"filtered": 100,
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"using_index": true
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}
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}
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}
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}
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}
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select row_number() over () from (select 4) as t;
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row_number() over ()
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1
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select min(a) over (), max(a) over (), a, row_number() over ()
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from t1
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where a = 0;
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min(a) over () max(a) over () a row_number() over ()
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0 0 0 1
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0 0 0 2
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0 0 0 3
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select a, min(a) over (), max(a) over (), row_number() over ()
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from t1
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where a = 0;
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a min(a) over () max(a) over () row_number() over ()
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0 0 0 1
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0 0 0 2
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0 0 0 3
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select min(a) over () + 1, max(a) over (), row_number() over ()
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from t1
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where a = 0;
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min(a) over () + 1 max(a) over () row_number() over ()
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1 0 1
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1 0 2
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1 0 3
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select min(a) over () + a, max(a) over (), row_number() over ()
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from t1
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where a = 1;
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min(a) over () + a max(a) over () row_number() over ()
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2 1 1
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2 1 2
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2 1 3
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select a + min(a) over (), max(a) over (), row_number() over ()
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from t1
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where a = 1;
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a + min(a) over () max(a) over () row_number() over ()
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2 1 1
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2 1 2
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2 1 3
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select a + min(a) over () from t1 where a = 1;
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a + min(a) over ()
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2
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2
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2
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create view win_view
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as (select a, min(a) over () from t1 where a = 1);
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select * from win_view;
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a min(a) over ()
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1 1
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1 1
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1 1
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drop view win_view;
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create view win_view
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as (select a, max(a + 1) over () from t1 where a = 1);
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select * from win_view;
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a max(a + 1) over ()
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1 2
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1 2
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1 2
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drop view win_view;
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drop table t1;
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