sql: LIR schema registry to support stable LIR#37814
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…ld MSEs), but architecture is there.
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Motivation
Closes https://linear.app/materializeinc/issue/SQL-288/lir-schema-registry.
Description
The LIR schema registry is a way of tracking LIR changes, so that LIR can be used as a stable format for, e.g., plan pinning.
This PR introduces the registry (stored in
src/compute-types/tests/snapshots/) and infrastructure for generating a registry and comparing types.As of 2026-07-22, this isn't quite ready to merge---some
*Funcs still haveMirScalarExprs in them. I'll put up a separate PR to fix that, then rebase this work on top.Verification
New tests should pass, old tests should be unaffected. Some sanity check tests have been applied---the right things should show up in the registry, and the wrong things should not.