The entire sstable cell value is currently stored in a single
temporary_buffer. Cells may be very large, so to avoid large
contiguous allocations, the buffer is changed to
a fragmented_temporary_buffer.
Fixes#7457Fixes#6376
Signed-off-by: Wojciech Mitros <wojciech.mitros@scylladb.com>
Currently, the primitive_consumer parses all values in contiguous buffers.
A string of bytes may be very long, so parsing it in a single buffer
can cause a big allocation. This patch allows parsing into
fragmented_temporary_buffers instead of temporary_buffers.
Signed-off-by: Wojciech Mitros <wojciech.mitros@scylladb.com>
Move stuff contained therein to `sstable_mutation_reader.{hh,cc}` which
will serve as the collection point of utility stuff needed by all reader
implementations.
Move all the mx format specific context and consumer code to
mx/reader.cc and add a factory function `mx::make_reader()` which takes
over the job of instantiating the `sstable_mutation_reader` with the mx
specific context and consumer.
