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diff: no -exclude / -allow-raw — one unparseable live object aborts the whole diff #85

Description

@orian

Symptom

One unparseable or unsupported object aborts an entire live diff run. The live side of diff hardcodes allowRaw=false (cmd/hclexp/hclexp.go:556) and diff exposes neither -allow-raw nor -exclude, so the exclude-patterns feature (#79) only helps introspect/dump-cluster.

Impact

hclexp diff -left ./schema -right clickhouse://... — the most common command — dies on the first transient _tmp_replace_* table or unsupported engine in the live database, with no way to skip it.

Fix direction

Thread -exclude <file> and -allow-raw through the diff subcommand into the introspection call, same semantics as introspect.

Found in the 2026-07-02 deep-dive audit (docs/plans/2026-07-02-deep-dive-improvement-areas.md, B1).

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