コード例 #1
0
    @Override
    public PlannedAnalyzedRelation visitQueriedTable(QueriedTable table, ConsumerContext context) {
      TableRelation tableRelation = table.tableRelation();
      if (table.querySpec().where().hasVersions()) {
        context.validationException(new VersionInvalidException());
        return null;
      }
      TableInfo tableInfo = tableRelation.tableInfo();

      if (tableInfo.schemaInfo().systemSchema() && table.querySpec().where().hasQuery()) {
        ensureNoLuceneOnlyPredicates(table.querySpec().where().query());
      }
      if (table.querySpec().hasAggregates()) {
        return GlobalAggregateConsumer.globalAggregates(
            functions, table, tableRelation, table.querySpec().where(), context);
      } else {
        return normalSelect(table, table.querySpec().where(), tableRelation, context);
      }
    }
コード例 #2
0
    private PlannedAnalyzedRelation normalSelect(
        QueriedTable table,
        WhereClause whereClause,
        TableRelation tableRelation,
        ConsumerContext context) {
      QuerySpec querySpec = table.querySpec();
      TableInfo tableInfo = tableRelation.tableInfo();

      List<Symbol> outputSymbols;
      if (tableInfo.schemaInfo().systemSchema()) {
        outputSymbols = tableRelation.resolve(querySpec.outputs());
      } else {
        outputSymbols = new ArrayList<>(querySpec.outputs().size());
        for (Symbol symbol : querySpec.outputs()) {
          outputSymbols.add(
              DocReferenceConverter.convertIfPossible(tableRelation.resolve(symbol), tableInfo));
        }
      }
      CollectNode collectNode;
      MergeNode mergeNode = null;
      OrderBy orderBy = querySpec.orderBy();
      if (context.rootRelation() != table) {
        // insert directly from shards
        assert !querySpec.isLimited()
            : "insert from sub query with limit or order by is not supported. "
                + "Analyzer should have thrown an exception already.";

        ImmutableList<Projection> projections = ImmutableList.<Projection>of();
        collectNode =
            PlanNodeBuilder.collect(
                context.plannerContext().jobId(),
                tableInfo,
                context.plannerContext(),
                whereClause,
                outputSymbols,
                projections);
      } else if (querySpec.isLimited() || orderBy != null) {
        /**
         * select id, name, order by id, date
         *
         * <p>toCollect: [id, name, date] // includes order by symbols, that aren't already selected
         * allOutputs: [in(0), in(1), in(2)] // for topN projection on shards/collectNode
         * orderByInputs: [in(0), in(2)] // for topN projection on shards/collectNode AND handler
         * finalOutputs: [in(0), in(1)] // for topN output on handler -> changes output to what
         * should be returned.
         */
        List<Symbol> toCollect;
        List<Symbol> orderByInputColumns = null;
        if (orderBy != null) {
          List<Symbol> orderBySymbols = tableRelation.resolve(orderBy.orderBySymbols());
          toCollect = new ArrayList<>(outputSymbols.size() + orderBySymbols.size());
          toCollect.addAll(outputSymbols);
          // note: can only de-dup order by symbols due to non-deterministic functions like select
          // random(), random()
          for (Symbol orderBySymbol : orderBySymbols) {
            if (!toCollect.contains(orderBySymbol)) {
              toCollect.add(orderBySymbol);
            }
          }
          orderByInputColumns = new ArrayList<>();
          for (Symbol symbol : orderBySymbols) {
            orderByInputColumns.add(new InputColumn(toCollect.indexOf(symbol), symbol.valueType()));
          }
        } else {
          toCollect = new ArrayList<>(outputSymbols.size());
          toCollect.addAll(outputSymbols);
        }

        List<Symbol> allOutputs = new ArrayList<>(toCollect.size()); // outputs from collector
        for (int i = 0; i < toCollect.size(); i++) {
          allOutputs.add(new InputColumn(i, toCollect.get(i).valueType()));
        }
        List<Symbol> finalOutputs =
            new ArrayList<>(outputSymbols.size()); // final outputs on handler after sort
        for (int i = 0; i < outputSymbols.size(); i++) {
          finalOutputs.add(new InputColumn(i, outputSymbols.get(i).valueType()));
        }

        // if we have an offset we have to get as much docs from every node as we have offset+limit
        // otherwise results will be wrong
        TopNProjection tnp;
        int limit = firstNonNull(querySpec.limit(), Constants.DEFAULT_SELECT_LIMIT);
        if (orderBy == null) {
          tnp = new TopNProjection(querySpec.offset() + limit, 0);
        } else {
          tnp =
              new TopNProjection(
                  querySpec.offset() + limit,
                  0,
                  orderByInputColumns,
                  orderBy.reverseFlags(),
                  orderBy.nullsFirst());
        }
        tnp.outputs(allOutputs);
        collectNode =
            PlanNodeBuilder.collect(
                context.plannerContext().jobId(),
                tableInfo,
                context.plannerContext(),
                whereClause,
                toCollect,
                ImmutableList.<Projection>of(tnp));

        // MERGE
        tnp = new TopNProjection(limit, querySpec.offset());
        tnp.outputs(finalOutputs);
        if (orderBy == null) {
          // no sorting needed
          mergeNode =
              PlanNodeBuilder.localMerge(
                  context.plannerContext().jobId(),
                  ImmutableList.<Projection>of(tnp),
                  collectNode,
                  context.plannerContext());
        } else {
          // no order by needed in TopN as we already sorted on collector
          // and we merge sorted with SortedBucketMerger
          mergeNode =
              PlanNodeBuilder.sortedLocalMerge(
                  context.plannerContext().jobId(),
                  ImmutableList.<Projection>of(tnp),
                  orderBy,
                  allOutputs,
                  orderByInputColumns,
                  collectNode,
                  context.plannerContext());
        }
      } else {
        collectNode =
            PlanNodeBuilder.collect(
                context.plannerContext().jobId(),
                tableInfo,
                context.plannerContext(),
                whereClause,
                outputSymbols,
                ImmutableList.<Projection>of());
        mergeNode =
            PlanNodeBuilder.localMerge(
                context.plannerContext().jobId(),
                ImmutableList.<Projection>of(),
                collectNode,
                context.plannerContext());
      }
      return new QueryAndFetch(collectNode, mergeNode, context.plannerContext().jobId());
    }