Esempio n. 1
0
    private FunctionDescProto findFunction(
        String signature,
        FunctionType type,
        List<TajoDataTypes.DataType> params,
        boolean strictTypeCheck) {
      List<FunctionDescProto> candidates = Lists.newArrayList();

      if (functions.containsKey(signature)) {
        if (strictTypeCheck) {
          for (FunctionDescProto func : functions.get(signature)) {
            if (func.getSignature().getType() == type
                && func.getSignature().getParameterTypesList().equals(params)) {
              candidates.add(func);
            }
          }
        } else {
          for (FunctionDescProto func : functions.get(signature)) {
            if (func.getSignature().getParameterTypesList() != null
                && CatalogUtil.isMatchedFunction(
                    func.getSignature().getParameterTypesList(), params)) {
              candidates.add(func);
            }
          }
        }
      }

      // if there are more than one function candidates, we choose the nearest matched function.
      if (candidates.size() > 0) {
        return findNearestMatchedFunction(candidates);
      } else {
        return null;
      }
    }
Esempio n. 2
0
    private FunctionDescProto findFunction(String signature, List<TajoDataTypes.DataType> params) {
      List<FunctionDescProto> candidates = Lists.newArrayList();

      if (functions.containsKey(signature)) {
        for (FunctionDescProto func : functions.get(signature)) {
          if (func.getSignature().getParameterTypesList() != null
              && func.getSignature().getParameterTypesList().equals(params)) {
            candidates.add(func);
          }
        }
      }

      /*
       *
       * FALL BACK to look for nearest match
       * WORKING BUT BAD WAY TO IMPLEMENT.I WOULD RATHER implement compareTo in FunctionDesc to keep them
       * in sorted order of param types LIKE INT1 SHOULD BE BEFORE INT2 should be before INT3 so on.
       * Due to possibility of multiple parameters and types the permutation and combinations are endless
       * to implement compareTo so decided to take the shortcut.
       *
       * */
      if (functions.containsKey(signature)) {
        for (FunctionDescProto func : functions.get(signature)) {
          if (func.getSignature().getParameterTypesList() != null
              && CatalogUtil.isMatchedFunction(
                  func.getSignature().getParameterTypesList(), params)) {
            candidates.add(func);
          }
        }

        // if there are more than one function candidates, we choose the nearest matched function.
        if (candidates.size() > 0) {
          return findNearestMatchedFunction(candidates);
        } else {
          return null;
        }
      }

      return null;
    }