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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.
60 lines
1.4 KiB
Plaintext
60 lines
1.4 KiB
Plaintext
DROP DATABASE IF EXISTS mcs169_db;
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CREATE DATABASE mcs169_db;
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USE mcs169_db;
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SET default_storage_engine=Columnstore;
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CREATE TABLE t1 (a CHAR(1), b INT, c DATETIME, d DOUBLE);
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INSERT INTO t1 VALUES (NULL, NULL, '0-0-0', NULL),('a', 12, '1212-12-12', 1.19691E+100),('b', 13, '1313-3-13 13:13:13', 2.1961E+18),('c', 14, '1414-4-14', 0.16191),('d', 15, '2015-5-15 15:15:15', 1.971917);
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SHOW CREATE TABLE t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` char(1) DEFAULT NULL,
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`b` int(11) DEFAULT NULL,
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`c` datetime DEFAULT NULL,
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`d` double DEFAULT NULL
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) ENGINE=Columnstore DEFAULT CHARSET=latin1
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SELECT BIN(2);
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BIN(2)
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10
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SELECT BIN(3);
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BIN(3)
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11
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SELECT a, BIN(a) FROM t1;
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a BIN(a)
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NULL NULL
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a 0
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b 0
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c 0
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d 0
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SELECT b, BIN(b) FROM t1;
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b BIN(b)
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NULL NULL
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12 1100
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13 1101
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14 1110
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15 1111
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SELECT c, BIN(c) FROM t1;
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c BIN(c)
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0000-00-00 00:00:00 0
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1212-12-12 00:00:00 10010111100
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1313-03-13 13:13:13 10100100001
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1414-04-14 00:00:00 10110000110
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2015-05-15 15:15:15 11111011111
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SELECT d, BIN(d) FROM t1;
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d BIN(d)
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NULL NULL
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1.19691e100 1
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2.1961e18 10
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0.16191 0
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1.971917 1
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SELECT BINARY "abcd";
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BINARY "abcd"
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abcd
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SELECT BINARY a, BINARY b, BINARY c, BINARY d FROM t1;
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BINARY a BINARY b BINARY c BINARY d
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NULL NULL 0000-00-00 00:00:00 NULL
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a 12 1212-12-12 00:00:00 1196909999999999904341
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b 13 1313-03-13 13:13:13 2196100000000000000.00
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c 14 1414-04-14 00:00:00 0.161910
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d 15 2015-05-15 15:15:15 1.971917
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DROP DATABASE mcs169_db;
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