-- source include/have_compress.inc # # Test for compress and uncompress functions: # 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