static new ThreadLocal<Long> findConceptWhere_debug_scanned;

static <A extends Concept> A findConceptWhere_debug(Class<A> c, O... params) {
  ret findConceptWhere(mainConcepts, c, params);
}

static <A extends Concept> A findConceptWhere_debug(Concepts concepts, Class<A> c, O... params) {
  params = expandParams(c, params);
  
  int scanned = 0;
  try {
    
    // indexed
    if (concepts.fieldIndices != null)
      for (int i = 0; i < l(params); i += 2) {
        IFieldIndex<A, O> index = concepts.getFieldIndex(c, (S) params[i]);
        if (index != null) {
          for (A x : index.getAll(params[i+1])) {
            ++scanned;
            if (checkConceptFields(x, params)) ret x;
          }
          null;
        }
      }
      
    // table scan
    for (A x : concepts.list(c)) if (checkConceptFields(x, params)) ret x;
    null;
  } finally {
    addToLongThreadLocal(findConceptWhere_debug_scanned, scanned);
  }
}

static Concept findConceptWhere_debug(Concepts concepts, S c, O... params) {
  int scanned = 0;
  try {
    for (Concept x : concepts.list(c)) { ++scanned; if (checkConceptFields(x, params)) ret x; }
    null;
  } finally {
    addToLongThreadLocal(findConceptWhere_debug_scanned, scanned);
  }
}