Symptom
The engine switch in internal/loader/hcl/introspect.go:529-689 covers the MergeTree family (+ Replicated variants), Distributed, Log, Join, Null, Memory, Merge, Buffer, Kafka and TimeSeries. Everything else falls through to "unsupported engine" and aborts introspection (or requires -allow-raw).
Missing: S3, URL, File, MySQL, PostgreSQL, MongoDB, RabbitMQ, NATS, EmbeddedRocksDB, Dictionary-engine tables, VersionedCollapsingMergeTree, GraphiteMergeTree, and their Replicated variants.
Impact
Any database containing one of these engines cannot be introspected strictly; with -allow-raw the objects degrade to opaque raw{} blocks (text-diffed, DROP+CREATE on change).
Fix direction
Add typed engine specs incrementally, prioritized by what real deployments use (VersionedCollapsingMergeTree and the integration engines are the likeliest). Each addition per project rule needs introspect + dump + sqlgen + diff coverage.
Found in the 2026-07-02 deep-dive audit (docs/plans/2026-07-02-deep-dive-improvement-areas.md, B2).
Symptom
The engine switch in internal/loader/hcl/introspect.go:529-689 covers the MergeTree family (+ Replicated variants), Distributed, Log, Join, Null, Memory, Merge, Buffer, Kafka and TimeSeries. Everything else falls through to "unsupported engine" and aborts introspection (or requires
-allow-raw).Missing: S3, URL, File, MySQL, PostgreSQL, MongoDB, RabbitMQ, NATS, EmbeddedRocksDB, Dictionary-engine tables, VersionedCollapsingMergeTree, GraphiteMergeTree, and their Replicated variants.
Impact
Any database containing one of these engines cannot be introspected strictly; with
-allow-rawthe objects degrade to opaqueraw{}blocks (text-diffed, DROP+CREATE on change).Fix direction
Add typed engine specs incrementally, prioritized by what real deployments use (VersionedCollapsingMergeTree and the integration engines are the likeliest). Each addition per project rule needs introspect + dump + sqlgen + diff coverage.
Found in the 2026-07-02 deep-dive audit (docs/plans/2026-07-02-deep-dive-improvement-areas.md, B2).