diff options
Diffstat (limited to 'sql/ha_archive.cc')
| -rw-r--r-- | sql/ha_archive.cc | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/sql/ha_archive.cc b/sql/ha_archive.cc index 3885defb4d5..0fb0bc9f791 100644 --- a/sql/ha_archive.cc +++ b/sql/ha_archive.cc @@ -710,6 +710,28 @@ int ha_archive::write_row(byte *buf) if (init_archive_writer()) DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE); + /* + Varchar structures are constant in size but are not cleaned up request + to request. The following sets all unused space to null to improve + compression. + */ + for (Field **field=table->field ; *field ; field++) + { + DBUG_PRINT("archive",("Pack is %d\n", (*field)->pack_length())); + DBUG_PRINT("archive",("MyPack is %d\n", (*field)->data_length((char*) buf + (*field)->offset()))); + if ((*field)->real_type() == MYSQL_TYPE_VARCHAR) + { + uint actual_length= (*field)->data_length((char*) buf + (*field)->offset()); + uint offset= (*field)->offset() + actual_length + + (actual_length > 255 ? 2 : 1); + DBUG_PRINT("archive",("Offset is %d -> %d\n", actual_length, offset)); + /* + if ((*field)->pack_length() + (*field)->offset() != offset) + bzero(buf + offset, (size_t)((*field)->pack_length() + (actual_length > 255 ? 2 : 1) - (*field)->data_length)); + */ + } + } + share->rows_recorded++; rc= real_write_row(buf, share->archive_write); pthread_mutex_unlock(&share->mutex); |