in package/src/languageServiceManager/kustoLanguageService.ts [2198:2210]
private static createFunctionSymbol(fn: s.Function): sym.FunctionSymbol {
const parameters: sym.Parameter[] = fn.inputParameters.map((param) =>
KustoLanguageService.createParameter(param)
);
// TODO: handle outputColumns (right now it doesn't seem to be implemented for any function).
return new sym.FunctionSymbol.$ctor14(
fn.name,
fn.body,
KustoLanguageService.toBridgeList(parameters),
fn.docstring
);
}