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https://github.com/mariadb-corporation/mariadb-columnstore-engine.git
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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.
65 lines
1.6 KiB
Plaintext
65 lines
1.6 KiB
Plaintext
# tests updates that sets invalid range when we set value at max boundary that is less than max.
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--disable_warnings
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DROP DATABASE IF EXISTS test_empty_strings;
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CREATE DATABASE test_empty_strings;
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USE test_empty_strings;
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--enable_warnings
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CREATE TABLE t(s text) ENGINE=COLUMNSTORE;
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INSERT INTO t(s) VALUES (''), (NULL);
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SELECT COUNT(*) FROM t WHERE s IS NULL;
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SELECT COUNT(*) FROM t WHERE s IS NOT NULL;
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SELECT * FROM t;
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DROP TABLE t;
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CREATE TABLE t(s text) ENGINE=COLUMNSTORE;
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# this will test different code path in writeengine.
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INSERT INTO t(s) VALUES ('');
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INSERT INTO t(s) VALUES (NULL);
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SELECT * FROM t;
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SELECT COUNT(*) FROM t WHERE s IS NULL;
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DROP TABLE t;
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CREATE TABLE t(s text) ENGINE=COLUMNSTORE;
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# handling of some obsucure pseudo-null magic value.
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INSERT INTO t(s) VALUES ('_CpNuLl_'),(''), (NULL);
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SELECT * FROM t;
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SELECT COUNT(*) FROM t WHERE s IS NULL;
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DROP TABLE t;
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# There is a problem with comparison
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CREATE TABLE t(c6 CHAR(6)) ENGINE=COLUMNSTORE;
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INSERT INTO t(c6) VALUES ('a'), ('b'), ('c');
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SELECT 2, COUNT(*) FROM t WHERE (c6 <= 'b' OR c6 <= '');
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SELECT 2, COUNT(*) FROM t WHERE (c6 <= 'b');
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SELECT 0, COUNT(*) FROM t WHERE (c6 <= '');
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SELECT 0, COUNT(*) FROM t WHERE (c6 <= ' ');
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SELECT 2, COUNT(*) FROM t WHERE (c6 <= 'b' OR c6 <= ' ');
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SELECT 0, COUNT(*) FROM t WHERE (c6 < '');
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SELECT 0, COUNT(*) FROM t WHERE (c6 < ' ');
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DROP TABLE IF EXISTS t;
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CREATE TABLE t(a CHAR(10)) ENGINE=COLUMNSTORE;
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INSERT INTO t(a) VALUES (''), (NULL), (' '), (' a ');
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SELECT LTRIM_ORACLE(a) FROM t;
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SELECT RTRIM_ORACLE(a) FROM t;
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DROP DATABASE test_empty_strings;
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