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MDEV-15938 - TINYTEXT CHARACTER SET utf8 COMPRESSED truncates data

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Unexpected data truncation may occur when storing data to compressed blob
column having multi byte variable length character sets.

The reason was incorrect number of characters limit was enforced for
blobs.
This commit is contained in:
Sergey Vojtovich 2018-04-25 14:42:38 +04:00
commit 68cbabbfb0
6 changed files with 78 additions and 34 deletions
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9
mysql-test/main/column_compression_utf16.result Normal file
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#
# MDEV-15938 - TINYTEXT CHARACTER SET utf8 COMPRESSED truncates data
#
CREATE TABLE t1(a TINYTEXT COMPRESSED, b TINYTEXT) CHARACTER SET utf16;
INSERT INTO t1 VALUES (REPEAT(_latin1'a', 127), REPEAT(_latin1'a', 127));
SELECT CHAR_LENGTH(a), CHAR_LENGTH(b), LEFT(a, 10), LEFT(b, 10) FROM t1;
CHAR_LENGTH(a) CHAR_LENGTH(b) LEFT(a, 10) LEFT(b, 10)
127 127 aaaaaaaaaa aaaaaaaaaa
DROP TABLE t1;