skip last compress test if we're short of RAM

mysql-test/r/func_compress.result

@@ -69,6 +69,6 @@ Error	1259	ZLIB: Input data corrupted
 Error	1256	Uncompressed data size too large; the maximum size is 1048576 (probably, length of uncompressed data was corrupted)
 drop table t1;
 set @@max_allowed_packet=1048576*100;
-select compress(repeat('aaaaaaaaaa', 10000000)) is null;
-compress(repeat('aaaaaaaaaa', 10000000)) is null
+select compress(repeat('aaaaaaaaaa', IF(XXX, 10, 10000000))) is null;
+compress(repeat('aaaaaaaaaa', IF(XXX, 10, 10000000))) is null
 0

mysql-test/t/func_compress.test

@@ -38,7 +38,10 @@ 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;
-select compress(repeat('aaaaaaaaaa', 10000000)) is null;
+--replace_result "''" XXX "'1'" XXX
+eval select compress(repeat('aaaaaaaaaa', IF('$LOW_MEMORY', 10, 10000000))) is null;
+