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MDEV-21348 - column compression memory leak

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The Storage-Engine Independent Column Compression does not call
deflateEnd() when deflate() does not return Z_STREAM_END.

This for instance happens when the data is already (externally)
compressed and deflate() needs more space than the original data.

This patch is based on contribution by Martijn Broenland.
This commit is contained in:
Sergey Vojtovich
2020-04-02 00:39:54 +04:00
parent b092d35f13
commit b40b3720cb
3 changed files with 33 additions and 9 deletions
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11
mysql-test/main/column_compression.test
View File

@ -255,3 +255,14 @@ DROP TABLE t1;
CREATE TABLE t1 (a NVARCHAR(10) COMPRESSED BINARY COMPRESSED);
--error ER_PARSE_ERROR
CREATE TABLE t1 (a NVARCHAR(10) COMPRESSED DEFAULT '' COMPRESSED);
--echo #
--echo # MDEV-21348 - Memory leak in Storage-Engine Independent Column
--echo # Compression
--echo #
CREATE TABLE t1(a BLOB COMPRESSED);
SET column_compression_threshold=0;
INSERT INTO t1 VALUES('aa');
SET column_compression_threshold=DEFAULT;
DROP TABLE t1;