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MDEV-15762 - VARCHAR(0) COMPRESSED crashes the server

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Character set safe truncation is done when storing non-empty string in
VARCHAR(0) COMPRESSED column, so that string becomes empty. The code
didn't expect empty string after truncation.

Fixed by moving empty string check after truncation.
This commit is contained in:
Sergey Vojtovich
2018-04-03 16:19:37 +04:00
parent 43ab88f0ea
commit 3dec6c48bc
3 changed files with 27 additions and 8 deletions
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13
mysql-test/main/column_compression.result
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@ -1373,3 +1373,16 @@ bar
foo
SET SESSION optimizer_switch=DEFAULT;
DROP TABLE t1;
#
# MDEV-15762 - VARCHAR(0) COMPRESSED crashes the server
#
CREATE TABLE t1(a VARCHAR(0) COMPRESSED);
INSERT INTO t1 VALUES('a');
ERROR 22001: Data too long for column 'a' at row 1
INSERT INTO t1 VALUES(' ');
Warnings:
Note 1265 Data truncated for column 'a' at row 1
SELECT LENGTH(a) FROM t1;
LENGTH(a)
0
DROP TABLE t1;