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https://github.com/mariadb-corporation/mariadb-columnstore-engine.git
synced 2025-04-20 09:07:44 +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.
30 lines
993 B
Plaintext
30 lines
993 B
Plaintext
#
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# Test CASE function
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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 mcs174_db;
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--enable_warnings
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CREATE DATABASE mcs174_db;
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USE mcs174_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 b, c, (CASE WHEN a = 'b' THEN b ELSE c END) FROM t1;
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SELECT b, a, (CASE WHEN b > 13 THEN b ELSE a END) FROM t1;
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SELECT c, a, (CASE WHEN d > 1 THEN a ELSE c END) FROM t1;
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SELECT a, c, (CASE WHEN c IS NULL THEN a ELSE c END) FROM t1;
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SELECT (CASE WHEN a = 'a' THEN 0 ELSE 1 END) FROM t1;
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SELECT (CASE WHEN 10 > 5 THEN 'True' ELSE 'False' END);
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# Clean UP
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DROP DATABASE mcs174_db;
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