feat(core): add LambdaBuilder for build-time lambda validation#2
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limameml merged 7 commits intolimameml:limame.malainine/add-lambda-supportfrom Mar 17, 2026
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…ameter references Introduces LambdaBuilder, a context-aware builder that maintains a lambda parameter stack (lambdaContext) to validate parameter references at build time. Nested lambdas use the same builder, ensuring stepsOut is computed automatically. Mirrors the lambdaContext pattern from substrait-go.
Moves ProtoExpressionConverter to use LambdaBuilder for lambda parameter validation, removing the private LambdaParameterStack. Replaces builder-based roundtrip tests with parameterized JSON fixtures in expressions/lambda/. Adds arithmetic body test to isthmus LambdaExpressionTest.
…ment depth-capture mechanism
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WIP: Adds LambdaBuilder, a context-aware builder that validates lambda parameter references at build time. Mirrors the lambdaContext stack pattern from substrait-go. The builder maintains a parameter stack, pushing/popping around body construction so that stepsOut is computed automatically from the difference between the current stack depth and the depth when the scope was created. Nested lambdas use the same lb.lambda() call as root lambdas.
ProtoExpressionConverter now uses LambdaBuilder for lambda parameter validation during deserialization, replacing the private LambdaParameterStack inner class.
Tests are split across three files:
Built on top of substrait-io#710.
Ref substrait-io#688