qvd2parquet v0.5.0

Added

• Apache License 2.0. The project shipped without a licence file, which left
  its terms unstated.
• --timezone=none writes timestamps with no timezone (Parquet
  isAdjustedToUTC=false), preserving the QVD's naive wall clock so that every
  reader shows the same value regardless of where the file is converted or
  read. naive is accepted as a synonym.
• A zoned conversion now stamps tz=UTC rather than the zone it was given.
  --timezone states which zone the input wall clocks were recorded in, not how
  to label the output, and what gets stored once they are on the timeline is a
  UTC instant. Stamping the source zone made Arrow readers render the values
  back in it while engines reading the Parquet type alone -- which carries no
  name -- rendered the instant, so identical bytes showed two different times.
  --timezone=none is unaffected and still writes no zone.
• A zoned conversion now reports where it had to alter a wall clock. Twice a
  year a DST change skips an hour, so a reading in it does not exist and gets
  moved, or repeats an hour, so a reading in it has two instants and one is
  chosen. A QVD names no timezone, which makes both changes a consequence of
  the --timezone claim rather than of the data, so they are no longer silent.

Removed

• IMPLEMENTATION_PLAN.md. It described the build that has since happened and
  had drifted from the code; the README and CHANGELOG carry what is still true.
  It remains in the git history.

Changed

• Breaking. --timezone now defaults to none, so timestamps are written
  as the naive wall clock the QVD actually holds and nothing is converted
  unless asked. The previous default, Local, interpreted every reading in the
  converting machine's timezone, which made the output depend on where it ran:
  the same QVD produced three different instants on boxes in UTC, New York and
  Tokyo, none of them correct unless the data happened to come from that zone.
  Pass --timezone=Local to restore the old behaviour, or name the zone the
  data was recorded in to get true instants.

• Options.TimezoneName is now authoritative in Validate, which derives
  Location and NaiveTimestamps from it. Setting one of those fields alone no
  longer leaves the conversion disagreeing with the type.

• Timestamps are now timestamp[us] rather than timestamp[ms]. A Qlik serial
  resolves to about 0.63us at present-day dates, so milliseconds discarded real
  signal while still carrying the encoding noise that makes a stored 07:15:00
  surface as 07:14:59.999999. Rounding to the microsecond keeps the precision
  and removes the noise.

• Releases now ship Linux, Windows and macOS on amd64 and arm64 only. The
  32-bit, arm, ppc64le, s390x, riscv64 and BSD targets were building
  and shipping without being asked for. Another target is a matter of listing
  it in scripts/build-release.sh and the two workflow matrices, which a test
  keeps identical.

• The release workflow builds its targets in parallel, one job each, instead of
  looping through them in a single job. Together with the trimmed list that
  takes a release from about twenty minutes to a couple.

Install

Download the archive for your platform below, unpack it, and put qvd2parquet
on your PATH. Verify the download against SHA256SUMS:

shasum -a 256 -c SHA256SUMS --ignore-missing

Binaries are pure Go and statically linked, so they need no runtime
dependencies: Linux (amd64, arm64), Windows (amd64, arm64) and macOS (amd64,
arm64).