mirror of
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.
29 lines
885 B
Plaintext
29 lines
885 B
Plaintext
#
|
|
# Test COALESCE function
|
|
# Author: Bharath, bharath.bokka@mariadb.com
|
|
#
|
|
-- source ../include/have_columnstore.inc
|
|
|
|
--disable_warnings
|
|
DROP DATABASE IF EXISTS mcs173_db;
|
|
--enable_warnings
|
|
|
|
CREATE DATABASE mcs173_db;
|
|
USE mcs173_db;
|
|
|
|
SET default_storage_engine=Columnstore;
|
|
|
|
CREATE TABLE t1 (a CHAR(1), b INT, c DATETIME, d DOUBLE);
|
|
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);
|
|
--replace_regex /( COLLATE=latin1_swedish_ci)//
|
|
SHOW CREATE TABLE t1;
|
|
|
|
SELECT COALESCE(NULL, NULL, NULL, 'mariadb', NULL, 'columnstore');
|
|
SELECT COALESCE(NULL, 1, 2, 'columnstore');
|
|
SELECT a, COALESCE(a, 'na') FROM t1;
|
|
SELECT b, COALESCE(b, 'null value') FROM t1;
|
|
SELECT d, COALESCE(d, 'null value') FROM t1;
|
|
|
|
# Clean UP
|
|
DROP DATABASE mcs173_db;
|