… ok, final assessment - its not working with multiple results. The JSONPATH transformation service is not outputting multi-element results.
I tried to be clever and chain a second JSONPATH transformation, yet that failed due to no input:
JSONPATH:$..[?(@.price<15)]∩JSONPATH:$..begin
generates:
2023-01-22 15:45:21.129 [DEBUG] [ternal.JSonPathTransformationService] - transformation resulted in '[{"begin":"2023-01-23T00:00:00+01:00","end":"2023-01-23T01:00:00+01:00","price":14.896},{"begin":"2023-01-23T01:00:00+01:00","end":"2023-01-23T02:00:00+01:00","price":14.9},{"begin":"2023-01-23T02:00:00+01:00","end":"2023-01-23T03:00:00+01:00","price":14.84},{"begin":"2023-01-23T03:00:00+01:00","end":"2023-01-23T04:00:00+01:00","price":14.759},{"begin":"2023-01-23T04:00:00+01:00","end":"2023-01-23T05:00:00+01:00","price":14.988}]'
2023-01-22 15:45:21.129 [DEBUG] [ternal.JSonPathTransformationService] - about to transform 'NULL' by the function '$..begin'
Shall I file an issue on Github?