feat: expose PGLZ compression bindings + add pglz_inspect example #2326
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add example pglz_inspect - scaffold extension and add pglz_size() - add pglz_analyze_column() SRF - add pglz_recommend() and finalize README
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refactor: update PGLZ usage to use module path for consistency refactor: reorganize PGLZ module structure and move implementation to pglz_inspect
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Summary
Adds a safe Rust wrapper around PostgreSQL's in-tree PGLZ compressor (common/pg_lzcompress.h) and ships a companion example extension that uses it to advise DBAs on column-level compression decisions.
Motivation
pglz_compress / pglz_decompress / pglz_maximum_compressed_size are stable, palloc-free, elog-free C functions that ship with every supported PostgreSQL version. Extension authors today have no first-class way to call them from pgrx — they have to either reach into pg_sys and write their own unsafe, or shell out to SQL and pay the round-trip. Exposing a vetted safe wrapper lets the ecosystem build TOAST-aware tooling, custom storage layouts, compression-aware indexes.
Benefit
Real-world utility out of the box — pglz_inspect answers "should I compress this column?" with one query, lowering the barrier for DBAs evaluating PG14+'s per-column compression.