-- source include/have_compress.inc # # Test for compress and uncompress functions: # # Note that this test gives error in the gzip library when running under # valgrind, but these warnings can be ignored select @test_compress_string:='string for test compress function aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa '; select length(@test_compress_string); select uncompress(compress(@test_compress_string)); explain extended select uncompress(compress(@test_compress_string)); select uncompressed_length(compress(@test_compress_string))=length(@test_compress_string); explain extended select uncompressed_length(compress(@test_compress_string))=length(@test_compress_string); select uncompressed_length(compress(@test_compress_string)); select length(compress(@test_compress_string))<length(@test_compress_string); create table t1 (a text, b char(255), c char(4)) engine=myisam; insert into t1 (a,b,c) values (compress(@test_compress_string),compress(@test_compress_string),'d '); select uncompress(a) from t1; select uncompress(b) from t1; select concat('|',c,'|') from t1; drop table t1; select compress(""); select uncompress(""); select uncompress(compress("")); select uncompressed_length(""); # # errors # create table t1 (a text); insert t1 values (compress(null)), ('A\0\0\0BBBBBBBB'), (compress(space(50000))), (space(50000)); select length(a) from t1; select length(uncompress(a)) from t1; drop table t1; # # Bug #5497: a problem with large strings # note that when LOW_MEMORY is set the "test" below is meaningless # set @@max_allowed_packet=1048576*100; --replace_result "''" XXX "'1'" XXX eval select compress(repeat('aaaaaaaaaa', IF('$LOW_MEMORY', 10, 10000000))) is null; # # Bug #18643: problem with null values # create table t1(a blob); insert into t1 values(NULL), (compress('a')); select uncompress(a), uncompressed_length(a) from t1; drop table t1; # # Bug #23254: problem with compress(NULL) # create table t1(a blob); insert into t1 values ('0'), (NULL), ('0'); --disable_result_log select compress(a), compress(a) from t1; --enable_result_log select compress(a) is null from t1; drop table t1; --echo End of 4.1 tests # # Bug #18539: uncompress(d) is null: impossible? # create table t1 (a varchar(32) not null); insert into t1 values ('foo'); explain select * from t1 where uncompress(a) is null; select * from t1 where uncompress(a) is null; explain select *, uncompress(a) from t1; select *, uncompress(a) from t1; select *, uncompress(a), uncompress(a) is null from t1; drop table t1; # # Bug #44796: valgrind: too many my_longlong10_to_str_8bit warnings after # uncompressed_length # CREATE TABLE t1 (c1 INT); INSERT INTO t1 VALUES (1), (1111), (11111); SELECT UNCOMPRESS(c1), UNCOMPRESSED_LENGTH(c1) FROM t1; # We do not need the results, just make sure there are no valgrind errors --disable_result_log EXPLAIN EXTENDED SELECT * FROM (SELECT UNCOMPRESSED_LENGTH(c1) FROM t1) AS s; --enable_result_log DROP TABLE t1; --echo End of 5.0 tests