mirror of
https://github.com/mariadb-corporation/mariadb-columnstore-engine.git
synced 2025-04-18 21:44:02 +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.
45 lines
1.5 KiB
Plaintext
45 lines
1.5 KiB
Plaintext
DROP DATABASE IF EXISTS mcs218_db;
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CREATE DATABASE mcs218_db;
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USE mcs218_db;
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CREATE TABLE t1
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(
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t1_BIGINT BIGINT,
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t1_DOUBLE DOUBLE,
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t1_FLOAT FLOAT,
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t1_BLOB BLOB,
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t1_TEXT TEXT,
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t1_CHAR_1 CHAR(1),
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t1_DATETIME DATETIME
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)ENGINE=Columnstore;
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INSERT INTO t1 VALUES(NULL, NULL, NULL, NULL, NULL, NULL, '0-0-0');
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INSERT INTO t1 VALUES(203685477580676, -3.797693231E+108, -7.402866E+18, repeat('b',10), repeat('b',10), 'b', '2387-11-08 11:22:30.123');
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SELECT t1_BIGINT, MD5(t1_BIGINT) FROM t1 ORDER BY t1_BIGINT;
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t1_BIGINT MD5(t1_BIGINT)
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NULL NULL
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203685477580676 9e05a00575dbbdb0e9c03d479cea5eb9
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SELECT t1_DOUBLE, MD5(t1_DOUBLE) FROM t1 ORDER BY t1_DOUBLE;
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t1_DOUBLE MD5(t1_DOUBLE)
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NULL NULL
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-3.797693231e108 bba02430bfe020a8d8ddffaff6b04004
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SELECT t1_FLOAT, MD5(t1_FLOAT) FROM t1 ORDER BY t1_FLOAT;
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t1_FLOAT MD5(t1_FLOAT)
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NULL NULL
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-7.40287e18 4957f3df13f93c70ab3957bf738826dc
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SELECT t1_TEXT, MD5(t1_TEXT) FROM t1 ORDER BY t1_TEXT;
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t1_TEXT MD5(t1_TEXT)
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NULL NULL
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bbbbbbbbbb 82136b4240d6ce4ea7d03e51469a393b
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SELECT t1_CHAR_1, MD5(t1_CHAR_1) FROM t1 ORDER BY t1_CHAR_1;
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t1_CHAR_1 MD5(t1_CHAR_1)
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NULL NULL
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b 92eb5ffee6ae2fec3ad71c777531578f
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SELECT t1_DATETIME, MD5(t1_DATETIME) FROM t1 ORDER BY t1_DATETIME;
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t1_DATETIME MD5(t1_DATETIME)
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0000-00-00 00:00:00 8e30a659c31b53017073692309ab0da1
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2387-11-08 11:22:30 9cf01b3f830ff29aa3f394fd54ea5a23
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SELECT t1_DATETIME FROM t1 WHERE MD5(t1_DATETIME) <> 0 ORDER BY t1_DATETIME;
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t1_DATETIME
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0000-00-00 00:00:00
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2387-11-08 11:22:30
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DROP DATABASE mcs218_db;
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