Module compiler 

ViewDefinition compiler (SQLite/PostgreSQL SQL and MongoDB pipelines).

Thin façade over the IR-based pipeline:

1. build_plan walks the ViewDefinition JSON and produces a PlanNode tree plus the resolved ViewDefinition.constant[] values. The CompileTarget tunes target-specific lowering (e.g. trailing-[N] forEach).
2. The emitter lowers the plan to the target form: emit_plan for SQL via the Dialect trait, or emit_mongo for a MongoDB aggregation pipeline.

Returns SofError::Uncompilable for FHIRPath constructs the in-DB pipeline doesn’t yet handle (e.g. where(crit) chains, the boundary functions without a column type hint, deeper unionAll/repeat nesting). There is no in-process fallback — the REST handler maps these errors to 422 Unprocessable Entity.

Structs

CompiledPipeline

Output of compiling a ViewDefinition to a MongoDB aggregation pipeline.

CompiledQuery

Output of a successful ViewDefinition compilation.

Enums

CompileTarget

Backend a ViewDefinition is being compiled for. Drives target-specific lowering decisions in build_plan (e.g. whether trailing-[N] forEach paths may use a correlated subquery) and selects the emitter.

CompiledView

Compiled SQL-on-FHIR view, in the form the target backend executes: parameterised SQL, or a MongoDB aggregation pipeline.

SqlDialect

SQL dialect to target during compilation.

Functions

compile_view_definition

Compiles a raw ViewDefinition JSON value into a CompiledQuery for SQLite.

compile_view_definition_dialect

Compiles a raw ViewDefinition JSON value into a CompiledQuery for the given dialect.

compile_view_definition_mongo

Compiles a raw ViewDefinition JSON value into a MongoDB aggregation pipeline.