Improve test coverage for multi-column MCV lists
The regression tests for extended statistics were not testing a couple
of important cases for the MCV lists:
* IS NOT NULL clauses - We did have queries with IS NULL clauses, but
not the negative case.
* clauses with variable on the right - All the clauses had the Var on
the left, i.e. (Var op Const), so this adds (Const op Var) too.
* columns with fixed-length types passed by reference - All columns
were using either by-value or varlena types, so add a test with
UUID columns too. This matters for (de)serialization.
* NULL-only dimension - When one of the columns contains only NULL
values, we treat it a a special case during (de)serialization.
* arrays containing NULL - When the constant parameter contains NULL
value, we need to handle it correctly during estimation, for all
IN, ANY and ALL clauses.
Discussion: https://www.postgresql.org/message-id/flat/20200113230008.g67iyk4cs3xbnjju@development
Author: Tomas Vondra
This commit is contained in:
Tomas Vondra
parent
f9696782c7
commit
d8cfa82d51
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@ -816,18 +816,36 @@ SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = 1 AND b =
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1 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE 1 = a AND ''1'' = b');
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estimated | actual
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-----------+--------
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1 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < 1 AND b < ''1''');
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estimated | actual
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-----------+--------
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1 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE 1 > a AND ''1'' > b');
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estimated | actual
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-----------+--------
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1 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a <= 0 AND b <= ''0''');
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estimated | actual
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-----------+--------
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1 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE 0 >= a AND ''0'' >= b');
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estimated | actual
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-----------+--------
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1 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = 1 AND b = ''1'' AND c = 1');
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estimated | actual
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-----------+--------
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@ -840,12 +858,24 @@ SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < 5 AND b <
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1 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < 5 AND ''1'' > b AND 5 > c');
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estimated | actual
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-----------+--------
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1 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a <= 4 AND b <= ''0'' AND c <= 4');
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estimated | actual
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-----------+--------
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1 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE 4 >= a AND ''0'' >= b AND 4 >= c');
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estimated | actual
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-----------+--------
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1 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = 1 OR b = ''1'' OR c = 1');
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estimated | actual
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-----------+--------
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@ -864,30 +894,60 @@ SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IN (1, 2, 51
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8 | 200
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IN (1, 2, 51, 52, NULL) AND b IN ( ''1'', ''2'', NULL)');
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estimated | actual
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-----------+--------
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8 | 200
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = ANY (ARRAY[1, 2, 51, 52]) AND b = ANY (ARRAY[''1'', ''2''])');
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estimated | actual
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-----------+--------
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8 | 200
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = ANY (ARRAY[NULL, 1, 2, 51, 52]) AND b = ANY (ARRAY[''1'', ''2'', NULL])');
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estimated | actual
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-----------+--------
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8 | 200
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a <= ANY (ARRAY[1, 2, 3]) AND b IN (''1'', ''2'', ''3'')');
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estimated | actual
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-----------+--------
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26 | 150
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a <= ANY (ARRAY[1, NULL, 2, 3]) AND b IN (''1'', ''2'', NULL, ''3'')');
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estimated | actual
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-----------+--------
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26 | 150
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < ALL (ARRAY[4, 5]) AND c > ANY (ARRAY[1, 2, 3])');
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estimated | actual
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-----------+--------
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10 | 100
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < ALL (ARRAY[4, 5]) AND c > ANY (ARRAY[1, 2, 3, NULL])');
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estimated | actual
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-----------+--------
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10 | 100
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < ALL (ARRAY[4, 5]) AND b IN (''1'', ''2'', ''3'') AND c > ANY (ARRAY[1, 2, 3])');
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estimated | actual
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-----------+--------
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1 | 100
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < ALL (ARRAY[4, 5]) AND b IN (''1'', ''2'', NULL, ''3'') AND c > ANY (ARRAY[1, 2, NULL, 3])');
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estimated | actual
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-----------+--------
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1 | 100
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(1 row)
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-- create statistics
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CREATE STATISTICS mcv_lists_stats (mcv) ON a, b, c FROM mcv_lists;
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ANALYZE mcv_lists;
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@ -897,18 +957,36 @@ SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = 1 AND b =
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50 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE 1 = a AND ''1'' = b');
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estimated | actual
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-----------+--------
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50 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < 1 AND b < ''1''');
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estimated | actual
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-----------+--------
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50 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE 1 > a AND ''1'' > b');
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estimated | actual
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-----------+--------
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50 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a <= 0 AND b <= ''0''');
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estimated | actual
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-----------+--------
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50 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE 0 >= a AND ''0'' >= b');
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estimated | actual
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-----------+--------
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50 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = 1 AND b = ''1'' AND c = 1');
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estimated | actual
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-----------+--------
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@ -921,12 +999,24 @@ SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < 5 AND b <
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50 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < 5 AND ''1'' > b AND 5 > c');
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estimated | actual
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-----------+--------
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50 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a <= 4 AND b <= ''0'' AND c <= 4');
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estimated | actual
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-----------+--------
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50 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE 4 >= a AND ''0'' >= b AND 4 >= c');
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estimated | actual
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-----------+--------
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50 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = 1 OR b = ''1'' OR c = 1');
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estimated | actual
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-----------+--------
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@ -939,30 +1029,60 @@ SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IN (1, 2, 51
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200 | 200
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IN (1, 2, 51, 52, NULL) AND b IN ( ''1'', ''2'', NULL)');
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estimated | actual
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-----------+--------
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200 | 200
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = ANY (ARRAY[1, 2, 51, 52]) AND b = ANY (ARRAY[''1'', ''2''])');
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estimated | actual
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-----------+--------
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200 | 200
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = ANY (ARRAY[NULL, 1, 2, 51, 52]) AND b = ANY (ARRAY[''1'', ''2'', NULL])');
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estimated | actual
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-----------+--------
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200 | 200
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a <= ANY (ARRAY[1, 2, 3]) AND b IN (''1'', ''2'', ''3'')');
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estimated | actual
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-----------+--------
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150 | 150
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a <= ANY (ARRAY[1, NULL, 2, 3]) AND b IN (''1'', ''2'', NULL, ''3'')');
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estimated | actual
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-----------+--------
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150 | 150
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < ALL (ARRAY[4, 5]) AND c > ANY (ARRAY[1, 2, 3])');
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estimated | actual
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-----------+--------
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100 | 100
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < ALL (ARRAY[4, 5]) AND c > ANY (ARRAY[1, 2, 3, NULL])');
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estimated | actual
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-----------+--------
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100 | 100
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < ALL (ARRAY[4, 5]) AND b IN (''1'', ''2'', ''3'') AND c > ANY (ARRAY[1, 2, 3])');
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estimated | actual
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-----------+--------
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100 | 100
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < ALL (ARRAY[4, 5]) AND b IN (''1'', ''2'', NULL, ''3'') AND c > ANY (ARRAY[1, 2, NULL, 3])');
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estimated | actual
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-----------+--------
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100 | 100
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(1 row)
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-- we can't use the statistic for OR clauses that are not fully covered (missing 'd' attribute)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = 1 OR b = ''1'' OR c = 1 OR d IS NOT NULL');
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estimated | actual
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@ -1019,6 +1139,24 @@ SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IS NULL AND
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1 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IS NULL AND b IS NOT NULL');
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estimated | actual
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-----------+--------
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49 | 0
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IS NOT NULL AND b IS NULL AND c IS NOT NULL');
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estimated | actual
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-----------+--------
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95 | 0
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IN (0, 1) AND b IN (''0'', ''1'')');
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estimated | actual
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-----------+--------
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1 | 50
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(1 row)
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-- create statistics
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CREATE STATISTICS mcv_lists_stats (mcv) ON a, b, c FROM mcv_lists;
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ANALYZE mcv_lists;
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@ -1034,6 +1172,24 @@ SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IS NULL AND
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50 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IS NULL AND b IS NOT NULL');
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estimated | actual
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-----------+--------
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1 | 0
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IS NOT NULL AND b IS NULL AND c IS NOT NULL');
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estimated | actual
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-----------+--------
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1 | 0
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IN (0, 1) AND b IN (''0'', ''1'')');
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estimated | actual
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-----------+--------
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50 | 50
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(1 row)
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-- test pg_mcv_list_items with a very simple (single item) MCV list
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TRUNCATE mcv_lists;
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INSERT INTO mcv_lists (a, b, c) SELECT 1, 2, 3 FROM generate_series(1,1000) s(i);
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@ -1053,7 +1209,7 @@ TRUNCATE mcv_lists;
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DROP STATISTICS mcv_lists_stats;
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INSERT INTO mcv_lists (a, b, c, d)
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SELECT
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(CASE WHEN mod(i,2) = 0 THEN NULL ELSE 0 END),
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NULL, -- always NULL
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(CASE WHEN mod(i,2) = 0 THEN NULL ELSE 'x' END),
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(CASE WHEN mod(i,2) = 0 THEN NULL ELSE 0 END),
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(CASE WHEN mod(i,2) = 0 THEN NULL ELSE 'x' END)
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@ -1065,15 +1221,92 @@ SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE b = ''x'' OR d
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3750 | 2500
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = 1 OR b = ''x'' OR d = ''x''');
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estimated | actual
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-----------+--------
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3750 | 2500
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IS NULL AND (b = ''x'' OR d = ''x'')');
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estimated | actual
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-----------+--------
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3750 | 2500
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(1 row)
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-- create statistics
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CREATE STATISTICS mcv_lists_stats (mcv) ON b, d FROM mcv_lists;
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CREATE STATISTICS mcv_lists_stats (mcv) ON a, b, d FROM mcv_lists;
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ANALYZE mcv_lists;
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-- test pg_mcv_list_items with MCV list containing variable-length data and NULLs
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SELECT m.*
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FROM pg_statistic_ext s, pg_statistic_ext_data d,
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pg_mcv_list_items(d.stxdmcv) m
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WHERE s.stxname = 'mcv_lists_stats'
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AND d.stxoid = s.oid;
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index | values | nulls | frequency | base_frequency
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-------+------------------+---------+-----------+----------------
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0 | {NULL,x,x} | {t,f,f} | 0.5 | 0.25
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1 | {NULL,NULL,NULL} | {t,t,t} | 0.5 | 0.25
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(2 rows)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE b = ''x'' OR d = ''x''');
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estimated | actual
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-----------+--------
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2500 | 2500
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = 1 OR b = ''x'' OR d = ''x''');
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estimated | actual
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-----------+--------
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2500 | 2500
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IS NULL AND (b = ''x'' OR d = ''x'')');
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estimated | actual
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-----------+--------
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2500 | 2500
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(1 row)
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-- mcv with pass-by-ref fixlen types, e.g. uuid
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CREATE TABLE mcv_lists_uuid (
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a UUID,
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b UUID,
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c UUID
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);
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INSERT INTO mcv_lists_uuid (a, b, c)
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SELECT
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md5(mod(i,100)::text)::uuid,
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md5(mod(i,50)::text)::uuid,
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md5(mod(i,25)::text)::uuid
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FROM generate_series(1,5000) s(i);
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ANALYZE mcv_lists_uuid;
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists_uuid WHERE a = ''1679091c-5a88-0faf-6fb5-e6087eb1b2dc'' AND b = ''1679091c-5a88-0faf-6fb5-e6087eb1b2dc''');
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estimated | actual
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-----------+--------
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1 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists_uuid WHERE a = ''1679091c-5a88-0faf-6fb5-e6087eb1b2dc'' AND b = ''1679091c-5a88-0faf-6fb5-e6087eb1b2dc'' AND c = ''1679091c-5a88-0faf-6fb5-e6087eb1b2dc''');
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estimated | actual
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-----------+--------
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1 | 50
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(1 row)
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CREATE STATISTICS mcv_lists_uuid_stats (mcv) ON a, b, c
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FROM mcv_lists_uuid;
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ANALYZE mcv_lists_uuid;
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists_uuid WHERE a = ''1679091c-5a88-0faf-6fb5-e6087eb1b2dc'' AND b = ''1679091c-5a88-0faf-6fb5-e6087eb1b2dc''');
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estimated | actual
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-----------+--------
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50 | 50
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(1 row)
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists_uuid WHERE a = ''1679091c-5a88-0faf-6fb5-e6087eb1b2dc'' AND b = ''1679091c-5a88-0faf-6fb5-e6087eb1b2dc'' AND c = ''1679091c-5a88-0faf-6fb5-e6087eb1b2dc''');
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estimated | actual
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-----------+--------
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50 | 50
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(1 row)
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DROP TABLE mcv_lists_uuid;
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-- mcv with arrays
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CREATE TABLE mcv_lists_arrays (
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a TEXT[],
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@ -454,30 +454,50 @@ ANALYZE mcv_lists;
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = 1 AND b = ''1''');
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE 1 = a AND ''1'' = b');
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < 1 AND b < ''1''');
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE 1 > a AND ''1'' > b');
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SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a <= 0 AND b <= ''0''');
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||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE 0 >= a AND ''0'' >= b');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = 1 AND b = ''1'' AND c = 1');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < 5 AND b < ''1'' AND c < 5');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < 5 AND ''1'' > b AND 5 > c');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a <= 4 AND b <= ''0'' AND c <= 4');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE 4 >= a AND ''0'' >= b AND 4 >= c');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = 1 OR b = ''1'' OR c = 1');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = 1 OR b = ''1'' OR c = 1 OR d IS NOT NULL');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IN (1, 2, 51, 52) AND b IN ( ''1'', ''2'')');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IN (1, 2, 51, 52, NULL) AND b IN ( ''1'', ''2'', NULL)');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = ANY (ARRAY[1, 2, 51, 52]) AND b = ANY (ARRAY[''1'', ''2''])');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = ANY (ARRAY[NULL, 1, 2, 51, 52]) AND b = ANY (ARRAY[''1'', ''2'', NULL])');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a <= ANY (ARRAY[1, 2, 3]) AND b IN (''1'', ''2'', ''3'')');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a <= ANY (ARRAY[1, NULL, 2, 3]) AND b IN (''1'', ''2'', NULL, ''3'')');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < ALL (ARRAY[4, 5]) AND c > ANY (ARRAY[1, 2, 3])');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < ALL (ARRAY[4, 5]) AND c > ANY (ARRAY[1, 2, 3, NULL])');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < ALL (ARRAY[4, 5]) AND b IN (''1'', ''2'', ''3'') AND c > ANY (ARRAY[1, 2, 3])');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < ALL (ARRAY[4, 5]) AND b IN (''1'', ''2'', NULL, ''3'') AND c > ANY (ARRAY[1, 2, NULL, 3])');
|
||||
|
||||
-- create statistics
|
||||
CREATE STATISTICS mcv_lists_stats (mcv) ON a, b, c FROM mcv_lists;
|
||||
|
||||
|
|
@ -485,28 +505,48 @@ ANALYZE mcv_lists;
|
|||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = 1 AND b = ''1''');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE 1 = a AND ''1'' = b');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < 1 AND b < ''1''');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE 1 > a AND ''1'' > b');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a <= 0 AND b <= ''0''');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE 0 >= a AND ''0'' >= b');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = 1 AND b = ''1'' AND c = 1');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < 5 AND b < ''1'' AND c < 5');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < 5 AND ''1'' > b AND 5 > c');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a <= 4 AND b <= ''0'' AND c <= 4');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE 4 >= a AND ''0'' >= b AND 4 >= c');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = 1 OR b = ''1'' OR c = 1');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IN (1, 2, 51, 52) AND b IN ( ''1'', ''2'')');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IN (1, 2, 51, 52, NULL) AND b IN ( ''1'', ''2'', NULL)');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = ANY (ARRAY[1, 2, 51, 52]) AND b = ANY (ARRAY[''1'', ''2''])');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = ANY (ARRAY[NULL, 1, 2, 51, 52]) AND b = ANY (ARRAY[''1'', ''2'', NULL])');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a <= ANY (ARRAY[1, 2, 3]) AND b IN (''1'', ''2'', ''3'')');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a <= ANY (ARRAY[1, NULL, 2, 3]) AND b IN (''1'', ''2'', NULL, ''3'')');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < ALL (ARRAY[4, 5]) AND c > ANY (ARRAY[1, 2, 3])');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < ALL (ARRAY[4, 5]) AND c > ANY (ARRAY[1, 2, 3, NULL])');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < ALL (ARRAY[4, 5]) AND b IN (''1'', ''2'', ''3'') AND c > ANY (ARRAY[1, 2, 3])');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a < ALL (ARRAY[4, 5]) AND b IN (''1'', ''2'', NULL, ''3'') AND c > ANY (ARRAY[1, 2, NULL, 3])');
|
||||
|
||||
-- we can't use the statistic for OR clauses that are not fully covered (missing 'd' attribute)
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = 1 OR b = ''1'' OR c = 1 OR d IS NOT NULL');
|
||||
|
||||
|
|
@ -545,6 +585,12 @@ SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IS NULL AND
|
|||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IS NULL AND b IS NULL AND c IS NULL');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IS NULL AND b IS NOT NULL');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IS NOT NULL AND b IS NULL AND c IS NOT NULL');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IN (0, 1) AND b IN (''0'', ''1'')');
|
||||
|
||||
-- create statistics
|
||||
CREATE STATISTICS mcv_lists_stats (mcv) ON a, b, c FROM mcv_lists;
|
||||
|
||||
|
|
@ -554,6 +600,12 @@ SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IS NULL AND
|
|||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IS NULL AND b IS NULL AND c IS NULL');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IS NULL AND b IS NOT NULL');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IS NOT NULL AND b IS NULL AND c IS NOT NULL');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IN (0, 1) AND b IN (''0'', ''1'')');
|
||||
|
||||
-- test pg_mcv_list_items with a very simple (single item) MCV list
|
||||
TRUNCATE mcv_lists;
|
||||
INSERT INTO mcv_lists (a, b, c) SELECT 1, 2, 3 FROM generate_series(1,1000) s(i);
|
||||
|
|
@ -571,7 +623,7 @@ DROP STATISTICS mcv_lists_stats;
|
|||
|
||||
INSERT INTO mcv_lists (a, b, c, d)
|
||||
SELECT
|
||||
(CASE WHEN mod(i,2) = 0 THEN NULL ELSE 0 END),
|
||||
NULL, -- always NULL
|
||||
(CASE WHEN mod(i,2) = 0 THEN NULL ELSE 'x' END),
|
||||
(CASE WHEN mod(i,2) = 0 THEN NULL ELSE 0 END),
|
||||
(CASE WHEN mod(i,2) = 0 THEN NULL ELSE 'x' END)
|
||||
|
|
@ -581,13 +633,59 @@ ANALYZE mcv_lists;
|
|||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE b = ''x'' OR d = ''x''');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = 1 OR b = ''x'' OR d = ''x''');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IS NULL AND (b = ''x'' OR d = ''x'')');
|
||||
|
||||
-- create statistics
|
||||
CREATE STATISTICS mcv_lists_stats (mcv) ON b, d FROM mcv_lists;
|
||||
CREATE STATISTICS mcv_lists_stats (mcv) ON a, b, d FROM mcv_lists;
|
||||
|
||||
ANALYZE mcv_lists;
|
||||
|
||||
-- test pg_mcv_list_items with MCV list containing variable-length data and NULLs
|
||||
SELECT m.*
|
||||
FROM pg_statistic_ext s, pg_statistic_ext_data d,
|
||||
pg_mcv_list_items(d.stxdmcv) m
|
||||
WHERE s.stxname = 'mcv_lists_stats'
|
||||
AND d.stxoid = s.oid;
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE b = ''x'' OR d = ''x''');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a = 1 OR b = ''x'' OR d = ''x''');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists WHERE a IS NULL AND (b = ''x'' OR d = ''x'')');
|
||||
|
||||
-- mcv with pass-by-ref fixlen types, e.g. uuid
|
||||
CREATE TABLE mcv_lists_uuid (
|
||||
a UUID,
|
||||
b UUID,
|
||||
c UUID
|
||||
);
|
||||
|
||||
INSERT INTO mcv_lists_uuid (a, b, c)
|
||||
SELECT
|
||||
md5(mod(i,100)::text)::uuid,
|
||||
md5(mod(i,50)::text)::uuid,
|
||||
md5(mod(i,25)::text)::uuid
|
||||
FROM generate_series(1,5000) s(i);
|
||||
|
||||
ANALYZE mcv_lists_uuid;
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists_uuid WHERE a = ''1679091c-5a88-0faf-6fb5-e6087eb1b2dc'' AND b = ''1679091c-5a88-0faf-6fb5-e6087eb1b2dc''');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists_uuid WHERE a = ''1679091c-5a88-0faf-6fb5-e6087eb1b2dc'' AND b = ''1679091c-5a88-0faf-6fb5-e6087eb1b2dc'' AND c = ''1679091c-5a88-0faf-6fb5-e6087eb1b2dc''');
|
||||
|
||||
CREATE STATISTICS mcv_lists_uuid_stats (mcv) ON a, b, c
|
||||
FROM mcv_lists_uuid;
|
||||
|
||||
ANALYZE mcv_lists_uuid;
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists_uuid WHERE a = ''1679091c-5a88-0faf-6fb5-e6087eb1b2dc'' AND b = ''1679091c-5a88-0faf-6fb5-e6087eb1b2dc''');
|
||||
|
||||
SELECT * FROM check_estimated_rows('SELECT * FROM mcv_lists_uuid WHERE a = ''1679091c-5a88-0faf-6fb5-e6087eb1b2dc'' AND b = ''1679091c-5a88-0faf-6fb5-e6087eb1b2dc'' AND c = ''1679091c-5a88-0faf-6fb5-e6087eb1b2dc''');
|
||||
|
||||
DROP TABLE mcv_lists_uuid;
|
||||
|
||||
-- mcv with arrays
|
||||
CREATE TABLE mcv_lists_arrays (
|
||||
a TEXT[],
|
||||
|
|
|
|||
Loading…
Reference in New Issue