Beispiel #1
0
 public String debugString() {
   StringBuilder out = new StringBuilder();
   out.append(
       Objects.toStringHelper(this)
           .add("grouping_exprs", Expr.debugString(groupingExprs_))
           .add("aggregate_exprs", Expr.debugString(aggregateExprs_))
           .add(
               "intermediate_tuple",
               (intermediateTupleDesc_ == null) ? "null" : intermediateTupleDesc_.debugString())
           .add(
               "output_tuple",
               (outputTupleDesc_ == null) ? "null" : outputTupleDesc_.debugString())
           .toString());
   return out.toString();
 }
Beispiel #2
0
  /**
   * Returns a tuple descriptor for the aggregation/analytic's intermediate or final result,
   * depending on whether isOutputTuple is true or false. Also updates the appropriate substitution
   * map, and creates and registers auxiliary equality predicates between the grouping slots and the
   * grouping exprs.
   */
  private TupleDescriptor createTupleDesc(Analyzer analyzer, boolean isOutputTuple) {
    TupleDescriptor result =
        analyzer
            .getDescTbl()
            .createTupleDescriptor(tupleDebugName() + (isOutputTuple ? "-out" : "-intermed"));
    List<Expr> exprs =
        Lists.newArrayListWithCapacity(groupingExprs_.size() + aggregateExprs_.size());
    exprs.addAll(groupingExprs_);
    exprs.addAll(aggregateExprs_);

    int aggregateExprStartIndex = groupingExprs_.size();
    for (int i = 0; i < exprs.size(); ++i) {
      Expr expr = exprs.get(i);
      SlotDescriptor slotDesc = analyzer.addSlotDescriptor(result);
      slotDesc.setLabel(expr.toSql());
      slotDesc.setStats(ColumnStats.fromExpr(expr));
      Preconditions.checkState(expr.getType().isValid());
      slotDesc.setType(expr.getType());
      if (i < aggregateExprStartIndex) {
        // register equivalence between grouping slot and grouping expr;
        // do this only when the grouping expr isn't a constant, otherwise
        // it'll simply show up as a gratuitous HAVING predicate
        // (which would actually be incorrect if the constant happens to be NULL)
        if (!expr.isConstant()) {
          analyzer.createAuxEquivPredicate(new SlotRef(slotDesc), expr.clone());
        }
      } else {
        Preconditions.checkArgument(expr instanceof FunctionCallExpr);
        FunctionCallExpr aggExpr = (FunctionCallExpr) expr;
        if (aggExpr.isMergeAggFn()) {
          slotDesc.setLabel(aggExpr.getChild(0).toSql());
        } else {
          slotDesc.setLabel(aggExpr.toSql());
        }

        // count(*) is non-nullable.
        if (aggExpr.getFnName().getFunction().equals("count")) {
          // TODO: Consider making nullability a property of types or of builtin agg fns.
          // row_number, rank, and dense_rank are non-nullable as well.
          slotDesc.setIsNullable(false);
        }
        if (!isOutputTuple) {
          Type intermediateType = ((AggregateFunction) aggExpr.fn_).getIntermediateType();
          if (intermediateType != null) {
            // Use the output type as intermediate if the function has a wildcard decimal.
            if (!intermediateType.isWildcardDecimal()) {
              slotDesc.setType(intermediateType);
            } else {
              Preconditions.checkState(expr.getType().isDecimal());
            }
          }
        }
      }
    }
    String prefix = (isOutputTuple ? "result " : "intermediate ");
    LOG.trace(prefix + " tuple=" + result.debugString());
    return result;
  }