mirror of
https://github.com/mariadb-corporation/mariadb-columnstore-engine.git
synced 2025-04-21 19:45:56 +03:00
b53c231ca6
This patch improves handling of NULLs in textual fields in ColumnStore. Previously empty strings were considered NULLs and it could be a problem if data scheme allows for empty strings. It was also one of major reasons of behavior difference between ColumnStore and other engines in MariaDB family. Also, this patch fixes some other bugs and incorrect behavior, for example, incorrect comparison for "column <= ''" which evaluates to constant True for all purposes before this patch.
130 lines
2.6 KiB
Plaintext
130 lines
2.6 KiB
Plaintext
DROP DATABASE IF EXISTS mcs90_db;
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CREATE DATABASE mcs90_db;
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USE mcs90_db;
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CREATE USER IF NOT EXISTS 'cejuser'@'localhost' IDENTIFIED BY 'Vagrant1|0000001';
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GRANT ALL PRIVILEGES ON *.* TO 'cejuser'@'localhost';
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FLUSH PRIVILEGES;
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CREATE TABLE t1 (a INT, b CHAR(5))ENGINE=Columnstore;
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INSERT INTO t1 VALUES (NULL, NULL),(1, 'aaa'),(2, 'aaa'),(3, 'ccc'),(4, 'ddd'),(5, 'aaa'),(6, 'ddd'),(7, 'eee');
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SELECT * FROM t1;
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a b
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NULL NULL
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1 aaa
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2 aaa
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3 ccc
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4 ddd
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5 aaa
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6 ddd
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7 eee
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SELECT b, SUM(a) FROM t1 GROUP BY b ORDER BY b;
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b SUM(a)
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NULL NULL
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aaa 8
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ccc 3
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ddd 10
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eee 7
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SELECT SUM(a) FROM t1 WHERE b LIKE '%a%';
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SUM(a)
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8
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SELECT a, AVG(a) FROM t1 GROUP BY a ORDER BY a;
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a AVG(a)
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NULL NULL
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1 1.0000
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2 2.0000
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3 3.0000
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4 4.0000
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5 5.0000
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6 6.0000
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7 7.0000
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SELECT b, AVG(a) FROM t1 WHERE b LIKE '%a%' GROUP BY b;
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b AVG(a)
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aaa 2.6667
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SELECT COUNT(*) FROM t1;
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COUNT(*)
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8
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SELECT b, COUNT(*) FROM t1 GROUP BY b ORDER BY 1;
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b COUNT(*)
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NULL 1
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aaa 3
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ccc 1
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ddd 2
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eee 1
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SELECT t1.b, COUNT(*) FROM t1 JOIN t1 AS t ON t1.a = t.a GROUP BY t1.b ORDER BY 1;
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b COUNT(*)
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aaa 3
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ccc 1
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ddd 2
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eee 1
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SELECT MAX(a) FROM t1;
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MAX(a)
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7
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SELECT MIN(a) FROM t1;
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MIN(a)
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1
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CREATE TABLE t2 (a INT, b CHAR(5))ENGINE=Innodb;
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CREATE TABLE t3 (a INT, b CHAR(5))ENGINE=Myisam;
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INSERT INTO t2 VALUES (NULL, ''),(1, 'eee'),(3, 'ccc'),(5, 'jjj'),(6, ''),(7, 'ccc'),(9, 'eee'),(11, 'jjj');
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INSERT INTO t3 VALUES (NULL, ''),(1, 'eee'),(3, 'ccc'),(5, 'jjj'),(6, ''),(7, 'ccc'),(9, 'eee'),(11, 'jjj');
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SELECT t1.b, COUNT(*) FROM t1 JOIN t2 ON t1.a = t2.a GROUP BY t1.b ORDER BY 1;
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b COUNT(*)
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aaa 2
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ccc 1
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ddd 1
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eee 1
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SELECT t1.b, SUM(t1.a) FROM t1 JOIN t2 ON t1.a = t2.a GROUP BY t1.b ORDER BY 1;
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b SUM(t1.a)
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aaa 6
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ccc 3
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ddd 6
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eee 7
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SELECT t1.b, AVG(t1.a) FROM t1 JOIN t2 ON t1.a = t2.a GROUP BY t1.b ORDER BY 1;
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b AVG(t1.a)
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aaa 3.0000
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ccc 3.0000
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ddd 6.0000
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eee 7.0000
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SELECT t1.b, MAX(t1.a) FROM t1 JOIN t2 ON t1.a = t2.a GROUP BY t1.b ORDER BY 1;
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b MAX(t1.a)
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aaa 5
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ccc 3
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ddd 6
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eee 7
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SELECT t1.b, MIN(t1.a) FROM t1 JOIN t2 ON t1.a = t2.a GROUP BY t1.b ORDER BY 1;
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b MIN(t1.a)
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aaa 1
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ccc 3
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ddd 6
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eee 7
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SELECT t1.b, COUNT(*) FROM t1 JOIN t3 ON t1.a = t3.a GROUP BY t1.b ORDER BY 1;
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b COUNT(*)
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aaa 2
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ccc 1
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ddd 1
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eee 1
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SELECT t1.b, SUM(t1.a) FROM t1 JOIN t3 ON t1.a = t3.a GROUP BY t1.b ORDER BY 1;
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b SUM(t1.a)
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aaa 6
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ccc 3
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ddd 6
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eee 7
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SELECT t1.b, AVG(t1.a) FROM t1 JOIN t3 ON t1.a = t3.a GROUP BY t1.b ORDER BY 1;
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b AVG(t1.a)
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aaa 3.0000
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ccc 3.0000
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ddd 6.0000
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eee 7.0000
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SELECT t1.b, MAX(t1.a) FROM t1 JOIN t3 ON t1.a = t3.a GROUP BY t1.b ORDER BY 1;
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b MAX(t1.a)
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aaa 5
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ccc 3
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ddd 6
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eee 7
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SELECT t1.b, MIN(t1.a) FROM t1 JOIN t3 ON t1.a = t3.a GROUP BY t1.b ORDER BY 1;
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b MIN(t1.a)
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aaa 1
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ccc 3
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ddd 6
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eee 7
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DROP USER 'cejuser'@'localhost';
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DROP DATABASE mcs90_db;
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