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https://github.com/mariadb-corporation/mariadb-columnstore-engine.git
synced 2025-04-28 06:45:06 +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.
47 lines
1.2 KiB
Plaintext
47 lines
1.2 KiB
Plaintext
#
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# Test NULLIF, IFNULL, ISNULL functions
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# Author: Bharath, bharath.bokka@mariadb.com
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#
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-- source ../include/have_columnstore.inc
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--disable_warnings
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DROP DATABASE IF EXISTS mcs171_db;
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--enable_warnings
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CREATE DATABASE mcs171_db;
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USE mcs171_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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--replace_regex /( COLLATE=latin1_swedish_ci)//
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SHOW CREATE TABLE t1;
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SELECT IFNULL(NULL, 'abc');
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SELECT IFNULL(NULL, 123);
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SELECT IFNULL('abc', 123);
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SELECT ISNULL(NULL);
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SELECT ISNULL(1);
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SELECT ISNULL('a');
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SELECT NULLIF(1, 1);
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SELECT NULLIF('abc', 'a');
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--disable_warnings
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SELECT NULLIF(1, 'abcd');
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--enable_warnings
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SELECT a, ISNULL(a) FROM t1;
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SELECT b, ISNULL(b) FROM t1;
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SELECT c, ISNULL(c) FROM t1;
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SELECT d, ISNULL(d) FROM t1;
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SELECT a, IFNULL(a, 'Null Char') FROM t1;
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SELECT b, IFNULL(b, 'Null Integer') FROM t1;
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SELECT c, IFNULL(d, 'Null Decimal') FROM t1;
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SELECT a, NULLIF(a, 'c') FROM t1;
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SELECT b, NULLIF(b, 15) FROM t1;
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SELECT c, NULLIF(c, '2015-5-15') FROM t1;
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# Clean UP
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DROP DATABASE mcs171_db;
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