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Module mir

mz_adapter::explain

Module mir 

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EXPLAIN support for MIR structures.

The specialized Explain implementation for an MirRelationExpr wrapped in an Explainable newtype struct allows us to interpret more mz_repr::explain::ExplainConfig options. This is the case because Analysis derivation and Let normalization are defined in mz_transform and consequently are not available for the default Explain implementation for MirRelationExpr in mz_expr.