mirror of
https://github.com/mariadb-corporation/mariadb-columnstore-engine.git
synced 2025-05-28 13:01:26 +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.
84 lines
5.5 KiB
Plaintext
84 lines
5.5 KiB
Plaintext
DROP DATABASE IF EXISTS mcs77_db;
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CREATE DATABASE mcs77_db;
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USE mcs77_db;
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CREATE TABLE t1
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(
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t1_tinyint TINYINT DEFAULT 0,
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t1_int INT DEFAULT NULL,
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t1_bigint BIGINT,
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t1_decimal DECIMAL(5,2),
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t1_text TEXT,
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t1_char CHAR(5),
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t1_varchar VARCHAR(255) DEFAULT 'hello world!',
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t1_datetime DATETIME
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)ENGINE=Columnstore;
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INSERT INTO t1 VALUES();
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INSERT INTO t1 VALUES(NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
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INSERT INTO t1 VALUES(1, 123456, 987654321, 122.32, repeat('z', 20), 'aaa', repeat('a', 20), '1111-11-11 11:11:11');
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INSERT INTO t1 VALUES(0, 1023456, 887654321, 222.32, repeat('y', 20), 'aaa', repeat('b', 20), '1111-11-11 11:11:11');
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INSERT INTO t1 VALUES(1, -123456, -987654321, -122.32, repeat('z', 20), 'bbb', repeat('a', 20), '1111-11-11 11:11:11');
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INSERT INTO t1 VALUES(0, -1023456, -887654321, -222.32, repeat('x', 20), 'bbb', repeat('b', 20), '1111-11-11 11:11:11');
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SELECT * FROM t1;
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t1_tinyint t1_int t1_bigint t1_decimal t1_text t1_char t1_varchar t1_datetime
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0 NULL NULL NULL NULL NULL hello world! NULL
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NULL NULL NULL NULL NULL NULL NULL NULL
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1 123456 987654321 122.32 zzzzzzzzzzzzzzzzzzzz aaa aaaaaaaaaaaaaaaaaaaa 1111-11-11 11:11:11
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0 1023456 887654321 222.32 yyyyyyyyyyyyyyyyyyyy aaa bbbbbbbbbbbbbbbbbbbb 1111-11-11 11:11:11
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1 -123456 -987654321 -122.32 zzzzzzzzzzzzzzzzzzzz bbb aaaaaaaaaaaaaaaaaaaa 1111-11-11 11:11:11
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0 -1023456 -887654321 -222.32 xxxxxxxxxxxxxxxxxxxx bbb bbbbbbbbbbbbbbbbbbbb 1111-11-11 11:11:11
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SELECT * FROM t1 WHERE t1_int IS NULL;
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t1_tinyint t1_int t1_bigint t1_decimal t1_text t1_char t1_varchar t1_datetime
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0 NULL NULL NULL NULL NULL hello world! NULL
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NULL NULL NULL NULL NULL NULL NULL NULL
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SELECT * FROM t1 WHERE t1_tinyint = 0;
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t1_tinyint t1_int t1_bigint t1_decimal t1_text t1_char t1_varchar t1_datetime
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0 NULL NULL NULL NULL NULL hello world! NULL
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0 1023456 887654321 222.32 yyyyyyyyyyyyyyyyyyyy aaa bbbbbbbbbbbbbbbbbbbb 1111-11-11 11:11:11
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0 -1023456 -887654321 -222.32 xxxxxxxxxxxxxxxxxxxx bbb bbbbbbbbbbbbbbbbbbbb 1111-11-11 11:11:11
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SELECT * FROM t1 WHERE t1_tinyint != 0;
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t1_tinyint t1_int t1_bigint t1_decimal t1_text t1_char t1_varchar t1_datetime
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1 123456 987654321 122.32 zzzzzzzzzzzzzzzzzzzz aaa aaaaaaaaaaaaaaaaaaaa 1111-11-11 11:11:11
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1 -123456 -987654321 -122.32 zzzzzzzzzzzzzzzzzzzz bbb aaaaaaaaaaaaaaaaaaaa 1111-11-11 11:11:11
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SELECT * FROM t1 WHERE t1_bigint > 0;
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t1_tinyint t1_int t1_bigint t1_decimal t1_text t1_char t1_varchar t1_datetime
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1 123456 987654321 122.32 zzzzzzzzzzzzzzzzzzzz aaa aaaaaaaaaaaaaaaaaaaa 1111-11-11 11:11:11
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0 1023456 887654321 222.32 yyyyyyyyyyyyyyyyyyyy aaa bbbbbbbbbbbbbbbbbbbb 1111-11-11 11:11:11
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SELECT * FROM t1 WHERE t1_bigint < 0;
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t1_tinyint t1_int t1_bigint t1_decimal t1_text t1_char t1_varchar t1_datetime
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1 -123456 -987654321 -122.32 zzzzzzzzzzzzzzzzzzzz bbb aaaaaaaaaaaaaaaaaaaa 1111-11-11 11:11:11
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0 -1023456 -887654321 -222.32 xxxxxxxxxxxxxxxxxxxx bbb bbbbbbbbbbbbbbbbbbbb 1111-11-11 11:11:11
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SELECT * FROM t1 WHERE t1_decimal >= -122.22;
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t1_tinyint t1_int t1_bigint t1_decimal t1_text t1_char t1_varchar t1_datetime
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1 123456 987654321 122.32 zzzzzzzzzzzzzzzzzzzz aaa aaaaaaaaaaaaaaaaaaaa 1111-11-11 11:11:11
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0 1023456 887654321 222.32 yyyyyyyyyyyyyyyyyyyy aaa bbbbbbbbbbbbbbbbbbbb 1111-11-11 11:11:11
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SELECT * FROM t1 WHERE t1_decimal <= -122.22;
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t1_tinyint t1_int t1_bigint t1_decimal t1_text t1_char t1_varchar t1_datetime
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1 -123456 -987654321 -122.32 zzzzzzzzzzzzzzzzzzzz bbb aaaaaaaaaaaaaaaaaaaa 1111-11-11 11:11:11
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0 -1023456 -887654321 -222.32 xxxxxxxxxxxxxxxxxxxx bbb bbbbbbbbbbbbbbbbbbbb 1111-11-11 11:11:11
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SELECT * FROM t1 WHERE t1_text LIKE '%x%';
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t1_tinyint t1_int t1_bigint t1_decimal t1_text t1_char t1_varchar t1_datetime
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0 -1023456 -887654321 -222.32 xxxxxxxxxxxxxxxxxxxx bbb bbbbbbbbbbbbbbbbbbbb 1111-11-11 11:11:11
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SELECT * FROM t1 WHERE t1_datetime IN ('1111-11-11 11:11:10','1111-11-13 0:0:0');
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t1_tinyint t1_int t1_bigint t1_decimal t1_text t1_char t1_varchar t1_datetime
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SELECT * FROM t1 WHERE t1_datetime IN ('1111-11-11 11:11:11','1111-11-13 0:0:0');
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t1_tinyint t1_int t1_bigint t1_decimal t1_text t1_char t1_varchar t1_datetime
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1 123456 987654321 122.32 zzzzzzzzzzzzzzzzzzzz aaa aaaaaaaaaaaaaaaaaaaa 1111-11-11 11:11:11
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0 1023456 887654321 222.32 yyyyyyyyyyyyyyyyyyyy aaa bbbbbbbbbbbbbbbbbbbb 1111-11-11 11:11:11
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1 -123456 -987654321 -122.32 zzzzzzzzzzzzzzzzzzzz bbb aaaaaaaaaaaaaaaaaaaa 1111-11-11 11:11:11
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0 -1023456 -887654321 -222.32 xxxxxxxxxxxxxxxxxxxx bbb bbbbbbbbbbbbbbbbbbbb 1111-11-11 11:11:11
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SELECT * FROM t1 WHERE t1_datetime BETWEEN '111-11-10' AND '1111-11-12';
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t1_tinyint t1_int t1_bigint t1_decimal t1_text t1_char t1_varchar t1_datetime
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1 123456 987654321 122.32 zzzzzzzzzzzzzzzzzzzz aaa aaaaaaaaaaaaaaaaaaaa 1111-11-11 11:11:11
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0 1023456 887654321 222.32 yyyyyyyyyyyyyyyyyyyy aaa bbbbbbbbbbbbbbbbbbbb 1111-11-11 11:11:11
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1 -123456 -987654321 -122.32 zzzzzzzzzzzzzzzzzzzz bbb aaaaaaaaaaaaaaaaaaaa 1111-11-11 11:11:11
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0 -1023456 -887654321 -222.32 xxxxxxxxxxxxxxxxxxxx bbb bbbbbbbbbbbbbbbbbbbb 1111-11-11 11:11:11
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SELECT * FROM t1 WHERE t1_text LIKE '%x%' OR t1_varchar LIKE '%a%';
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t1_tinyint t1_int t1_bigint t1_decimal t1_text t1_char t1_varchar t1_datetime
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1 123456 987654321 122.32 zzzzzzzzzzzzzzzzzzzz aaa aaaaaaaaaaaaaaaaaaaa 1111-11-11 11:11:11
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1 -123456 -987654321 -122.32 zzzzzzzzzzzzzzzzzzzz bbb aaaaaaaaaaaaaaaaaaaa 1111-11-11 11:11:11
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0 -1023456 -887654321 -222.32 xxxxxxxxxxxxxxxxxxxx bbb bbbbbbbbbbbbbbbbbbbb 1111-11-11 11:11:11
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SELECT * FROM t1 WHERE t1_text LIKE '%x%' AND t1_varchar LIKE '%b%';
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t1_tinyint t1_int t1_bigint t1_decimal t1_text t1_char t1_varchar t1_datetime
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0 -1023456 -887654321 -222.32 xxxxxxxxxxxxxxxxxxxx bbb bbbbbbbbbbbbbbbbbbbb 1111-11-11 11:11:11
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DROP DATABASE mcs77_db;
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