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73e4a3c581
sstable features indicate that an sstable has some extension, or that some bug was fixed. They allow us to know if we can rely on certain properties in a read sstables. Currently, sstable features are set early in the read path (when we read the scylla metadata file) and very late in the write path (when we write the scylla metadata file just before sealing the sstable). However, we happen to read features before we set them in the write path - when we resize the bloom filter for a newly written sstable we instantiate an index reader, and that depends on some features. As a result, we read a disengaged optional (for the scylla metadata component) as if it was engaged. This somehow worked so far, but fails with libstdc++ hash table implementation. Fix it by moving storage of the features to the sstable itself, and setting it early in the write path. Fixes #23484 Closes scylladb/scylladb#23485