JsonPathFile
  JsonPathRootSegmentImpl(ROOT_SEGMENT)
    PsiElement($)('$')
  PsiElement(.)('.')
  JsonPathFunctionCallImpl(FUNCTION_CALL)
    JsonPathIdImpl(ID)
      PsiElement(IDENTIFIER)('sum')
    PsiElement(()('(')
    JsonPathFunctionArgsListImpl(FUNCTION_ARGS_LIST)
      JsonPathNumberLiteralImpl(NUMBER_LITERAL)
        PsiElement(INTEGER_NUMBER)('50')
    PsiElement())(')')