External sources & Parquet

Register a named table whose rows are populated from a remote JSON/NDJSON/CSV/Parquet endpoint or an S3-compatible / Azure Blob object, then query it with ordinary SQL.

• HTTP / HTTPS sources — --features external-sources (HTTP) or --features external-sources-tls (adds HTTPS via rustls).
• Object-store sources — --features external-sources-objstore (implies external-sources-tls); supports s3:// and az://.

The pure-Rust zero-dep Parquet reader supports the full pyarrow 24.0.0 matrix (`UNCOMPRESSED + Snappy + GZIP + zstd + LZ4_RAW + Brotli × PLAIN

• dictionary × V1 + V2 pages × flat REQUIRED + OPTIONAL + LIST + MAP<K,V> + struct + 3-deep cross-products × INT32 + INT64 + INT96 + DECIMAL(≤38) + FLBA + BYTE_ARRAY`).

Reference: Usage guide (full) §7c–7f. The Parquet capability matrix lives in README.md.