FHIR-46548: where clause on alias #1748 #1752
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This PR adds source variable handling to FHIR Path expression for FHIR-46548: where clause on alias #1748.
The source variables are not prefixed with %, the FHIRPath expressions need to be adapted for that, this is done by not caching the FHIRPath expression first and then when the source variables are known, the expression is adapted and cached, following the same approach as @brianpos has done in https://github.com/brianpos/fhir-net-mappinglanguage/blob/develop2/Hl7.Fhir.MappingLanguage/JavaStructureMapUtils-Execute.cs.
In addition the source variable in the iteration has been added that the where, check and log clause are working on with the current iteration variable.
a test case has been created, for that the https://github.com/FHIR/fhir-test-cases/pull/190/files needs to be integrated first, before the test can run successfully.