Graphannis

Fixed

- RelANNIS version 3.3 files with segmentation might also have a missing "span" column.
In case the "span" column is null, always attempt to reconstruct the actual value from
the corresponding node annotation instead of failing directly.

Changed

- Avoid unnecessary compacting of disk tables when collecting graph updates during import.
This speeds up both the GraphML and the relANNIS importer and can also reduce the
used main memory during import.
- Use release optimization of some of the performance sensitive crates even for debug builds.
This allows faster builds and debugging of our own code, while balancing performance.

Changed

- Update to graphANNIS 1.4.1

Added

- Added `clear()` method to the `WriteableGraphStorage` trait.

Fixed

- Limit the used main memory cache per `DiskTable` by only using a disk block cache for the C1 table.
Since we use a lot of disk-based maps during import of relANNIS files, the previous behavior could
add up to > 1GB easily, wich amongst other issues caused 205 to happen.
With this change, during relANNIS import the main memory usage should be limited to be less than 4GB,
which seams more reasonable than the previous 20+GB
- Reduce memory footprint during import when corpus contains a lot of escaped strings (as in 205)
- Avoid creating small fragmented main memory when importing corpora from relANNIS to help to fix 205

Changed

- Improved overall import speed of relANNIS corpora and when applying graph updates

Added

- The webservice endpoint `/search/node-descriptions` now returns
wether a node in the query is optional or not.

Fixed

- Queries with optional nodes with a smaller index than the last non-optional node could fail.
If the execution nodes re-order the match result vector internally, the query node index is
used to define the mapping. Unfortunately the largest index could be larger than the size of mappings,
which used to be used to create the output vector. By allowing empty elements in the output vector
and using the maximum value, we can still map the results properly.

Fixed

- Don't allow optional operands for non-negated operators