pgColumnar v1.0-dev

pgColumnar v1.0-dev is a pre-release marker for the 1.0 development line
(on-disk format 2.2). It builds from one source tree on PostgreSQL 13 through 19,
and every test suite passes on all seven majors.

Capabilities

• Column-oriented table access method (USING columnar) with per-column
  compression, chunk-group minimum and maximum skipping, per-chunk bloom filters,
  and a vectorized scan and aggregate path with late materialization.
• Compression codecs none, pglz, lz4, and zstd.
• count(*) from catalog metadata, parallel scan, and read stream prefetch on
  PostgreSQL 17 and later.
• Full index-only scan through a columnar visibility-map fork, on by default.
• Multiple projections (C-Store model): declared column subsets stored sorted,
  with a planner projection scan, on by default.
• Sorted storage with columnar.vacuum_sorted.
• Arrow and Parquet export and import, flat and nested (one-dimensional arrays
  and composite types), self-contained with no libarrow or libparquet dependency.

Documentation

Installation, user guide, administration, configuration, SQL reference,
features, benchmarks, limitations, and testing are under
docs/. The full list of
changes is in
CHANGELOG.md.

Status

This is a pre-release. The VERSION file is the source of truth for the release
marker. PostgreSQL 19 is validated against 19beta2; revalidation against the
final release is pending.