The test started failing following the push for BUG#41541.
Some of the algorithms access bytes beyond the input data
and this can affect up to one byte less than "word size"
which is BITS_SAVED / 8.
Fixed by adding (BITS_SAVED / 8) -1 bytes to buffer size
(i.e. Memory Segment #2) to avoid accessing un-allocated data.
myisam/mi_packrec.c:
Fixed _mi_read_pack_info() method to allocate (BITS_SAVED/8) - 1
bytes to the Memory Segment #2
mysql-test/r/myisampack.result:
Result file for BUG#43973
mysql-test/t/myisampack.test:
Testcase for BUG#43973
After the table is compressed by the myisampack utility,
opening the table by the server produces valgrind warnings.
This happens because when we try to read a record into the buffer
we alway assume that the remaining buffer to read is always equal
to word size(4 or 8 or 2 bytes) we read. Sometimes we have
remaining buffer size less than word size and trying to read the
entire word size will end up in valgrind errors.
Fixed by reading byte by byte when we detect the remaining buffer
size is less than the word size.
myisam/mi_packrec.c:
Fixed fill_buffer() to read byte by byte when the remaining
buffer size is less than word size.
mysql-test/r/myisampack.result:
Result file for BUG#41541
mysql-test/t/myisampack.test:
Testcase for BUG#41541
Extending the existing testcase written for BUG#40949 to verify
repair table operation for compressed tables
mysql-test/r/myisampack.result:
Modified result file for myisampack.test
mysql-test/t/myisampack.test:
Modified Testcase to test repair operation for compressed tables
reset diagnostics area state after error message is sent
mysql-test/r/myisampack.result:
test result
mysql-test/t/myisampack.test:
test case
sql/sql_table.cc:
reset diagnostics area state after error message is sent
With certain data sets (when compressed record length gets bigger than
uncompressed) myisamchk --unpack may corrupt data file.
Fixed that record length was wrongly restored from compressed table.
myisam/mi_check.c:
With compressed tables compressed record length may be bigger than
pack_reclength, thus we may allocate insufficient memory for record
buffer.
Let single function allocate record buffer, performing needed record
length calculations.
Still, it is not doable with parallel repair, as it allocates needed
record buffers at once. For parellel repair added better record length
calculation.
myisam/mi_open.c:
When calculating record buffer size, take into account that compressed
record length may be bigger than uncompressed.
myisam/mi_packrec.c:
With certain data set share->max_pack_length (compressed record length)
may be bigger than share->base.pack_reclength (packed record length).
set_if_bigger(pack_reclength, max_pack_length) in this case causes
myisamchk --unpack to write extra garbage, whereas pack_reclength
remains the same in new index file. As a result we get unreadable
table.
myisam/myisamchk.c:
With compressed tables compressed record length may be bigger than
pack_reclength, thus we may allocate insufficient memory for record
buffer.
Let single function allocate record buffer, performing needed record
length calculations.
mysql-test/mysql-test-run.pl:
Environment variables to execute myisamchk and myisampack.
mysql-test/r/myisampack.result:
New BitKeeper file ``mysql-test/r/myisampack.result''
mysql-test/t/myisampack.test:
New BitKeeper file ``mysql-test/t/myisampack.test''
