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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.
36 lines
1.2 KiB
Plaintext
36 lines
1.2 KiB
Plaintext
#
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# Test Self JOIN
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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 mcs81_db;
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--enable_warnings
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CREATE DATABASE mcs81_db;
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USE mcs81_db;
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CREATE TABLE t1 (t1_col1 INT, t1_col2 TEXT)ENGINE=Columnstore;
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INSERT INTO t1 VALUES (NULL, NULL);
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INSERT INTO t1 VALUES (1, repeat('a', 20)),(3, repeat('c', 20)),(5, repeat('a', 20)),(7, repeat('c', 20)),(9, repeat('a', 20));
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--sorted_result
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SELECT * FROM t1 AS a, t1 AS b WHERE a.t1_col1 = b.t1_col1;
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--sorted_result
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SELECT a.t1_col1,b.t1_col2 FROM t1 AS a, t1 AS b WHERE a.t1_col1 = b.t1_col1;
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SELECT a.t1_col1 AS a_col1, b.t1_col2 AS b_col2 FROM t1 AS a, t1 AS b WHERE a.t1_col1 = b.t1_col1 ORDER BY a.t1_col1;
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--sorted_result
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SELECT * FROM t1 a JOIN t1 b ON a.t1_col1 = b.t1_col1;
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--sorted_result
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SELECT a.t1_col1,b.t1_col2 FROM t1 a JOIN t1 b ON a.t1_col1 = b.t1_col1;
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SELECT a.t1_col1 AS a_col1, b.t1_col2 AS b_col2 FROM t1 a JOIN t1 b ON a.t1_col1 = b.t1_col1 ORDER BY b.t1_col1;
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--sorted_result
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SELECT * FROM t1 a INNER JOIN t1 b ON a.t1_col1 = b.t1_col1 AND b.t1_col1 > 5;
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SELECT * FROM t1 a LEFT JOIN t1 b ON a.t1_col1 = b.t1_col1 AND a.t1_col2 LIKE '%a%' ORDER BY a.t1_col1;
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# Clean UP
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DROP DATABASE mcs81_db;
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