In ExprFunctions.hpp, there are 3 functions:
- FunctionCalledbyQueryA(): This function is called by a query1.
- FunctionInternal1(): This function is called by FunctionInternal2.
- FunctionInternal2(): This function is called by FunctionCalledbyQueryA.
This ExprFunction.hpp was tested ok, query1 could be installed correctly and the query result is expected.
However, once I put the 3 functions (FunctionCalledbyQueryA(), FunctionInternal1(), FunctionInternal2()) to an existing ExprFunctions.hpp, which has lots of other interfaces functions and used by many other queries, then I tried to install a query now, it complained that “An unknown error occurred during installation.” as shown in the snapshot below.