"When compressor_parameters was introduced it only performed properties
validation, but wasn't properly wired to the rest of the code and the
compression information never made it to the final schema object.
This patchset changes that, now compression parameters are correctly processed
by schema builder as well written and read from system tables. Updated test
case makes sure that not only incorrect values are rejected during validation,
but also that correct values really are set in the created schema."
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