// implement RelOptRule
  public void onMatch(RelOptRuleCall call) {
    CalcRel calcRel = (CalcRel) call.rels[0];
    RexProgram program = calcRel.getProgram();

    // check the projection
    List<Integer> projOrdinals = new ArrayList<Integer>();
    RelDataType outputRowType = isProjectSimple(calcRel, projOrdinals);
    if (outputRowType == null) {
      return;
    }

    RexLocalRef condition = program.getCondition();
    CompOperatorEnum compOp = CompOperatorEnum.COMP_NOOP;
    Integer[] filterOrdinals = {};
    List<RexLiteral> filterLiterals = new ArrayList<RexLiteral>();

    // check the condition
    if (condition != null) {
      RexNode filterExprs = program.expandLocalRef(condition);
      List<Integer> filterList = new ArrayList<Integer>();

      List<CompOperatorEnum> op = new ArrayList<CompOperatorEnum>();
      if (!isConditionSimple(calcRel, filterExprs, filterList, filterLiterals, op)) {
        return;
      }

      compOp = op.get(0);
      filterOrdinals = filterList.toArray(new Integer[filterList.size()]);
    }

    RelNode fennelInput =
        mergeTraitsAndConvert(
            calcRel.getTraits(), FennelRel.FENNEL_EXEC_CONVENTION, calcRel.getChild());
    if (fennelInput == null) {
      return;
    }

    Integer[] projection = projOrdinals.toArray(new Integer[projOrdinals.size()]);
    FennelReshapeRel reshapeRel =
        new FennelReshapeRel(
            calcRel.getCluster(),
            fennelInput,
            projection,
            outputRowType,
            compOp,
            filterOrdinals,
            filterLiterals,
            new FennelRelParamId[] {},
            new Integer[] {},
            null);

    call.transformTo(reshapeRel);
  }
Пример #2
0
 /**
  * Creates a relational expression which permutes the output fields of a relational expression
  * according to a permutation.
  *
  * <p>Optimizations:
  *
  * <ul>
  *   <li>If the relational expression is a {@link CalcRel} or {@link ProjectRel} which is already
  *       acting as a permutation, combines the new permutation with the old;
  *   <li>If the permutation is the identity, returns the original relational expression.
  * </ul>
  *
  * <p>If a permutation is combined with its inverse, these optimizations would combine to remove
  * them both.
  *
  * @param rel Relational expression
  * @param permutation Permutation to apply to fields
  * @param fieldNames Field names; if null, or if a particular entry is null, the name of the
  *     permuted field is used
  * @return relational expression which permutes its input fields
  */
 public static RelNode permute(RelNode rel, Permutation permutation, List<String> fieldNames) {
   if (permutation.isIdentity()) {
     return rel;
   }
   if (rel instanceof CalcRel) {
     CalcRel calcRel = (CalcRel) rel;
     Permutation permutation1 = calcRel.getProgram().getPermutation();
     if (permutation1 != null) {
       Permutation permutation2 = permutation.product(permutation1);
       return permute(rel, permutation2, null);
     }
   }
   if (rel instanceof ProjectRel) {
     Permutation permutation1 = ((ProjectRel) rel).getPermutation();
     if (permutation1 != null) {
       Permutation permutation2 = permutation.product(permutation1);
       return permute(rel, permutation2, null);
     }
   }
   final List<RelDataType> outputTypeList = new ArrayList<RelDataType>();
   final List<String> outputNameList = new ArrayList<String>();
   final List<RexNode> exprList = new ArrayList<RexNode>();
   final List<RexLocalRef> projectRefList = new ArrayList<RexLocalRef>();
   final List<RelDataTypeField> fields = rel.getRowType().getFieldList();
   for (int i = 0; i < permutation.getTargetCount(); i++) {
     int target = permutation.getTarget(i);
     final RelDataTypeField targetField = fields.get(target);
     outputTypeList.add(targetField.getType());
     outputNameList.add(
         ((fieldNames == null) || (fieldNames.size() <= i) || (fieldNames.get(i) == null))
             ? targetField.getName()
             : fieldNames.get(i));
     exprList.add(rel.getCluster().getRexBuilder().makeInputRef(fields.get(i).getType(), i));
     final int source = permutation.getSource(i);
     projectRefList.add(new RexLocalRef(source, fields.get(source).getType()));
   }
   final RexProgram program =
       new RexProgram(
           rel.getRowType(),
           exprList,
           projectRefList,
           null,
           rel.getCluster().getTypeFactory().createStructType(outputTypeList, outputNameList));
   return new CalcRel(
       rel.getCluster(),
       rel.getTraitSet(),
       rel,
       program.getOutputRowType(),
       program,
       Collections.<RelCollation>emptyList());
 }
  /**
   * Determines if a filter condition is a simple one and returns the parameters corresponding to
   * the simple filters.
   *
   * @param calcRel original CalcRel
   * @param filterExprs filter expression being analyzed
   * @param filterList returns the list of filter ordinals in the simple expression
   * @param literals returns the list of literals to be used in the simple comparisons
   * @param op returns the operator to be used in the simple comparison
   * @return true if the filter condition is simple
   */
  private boolean isConditionSimple(
      CalcRel calcRel,
      RexNode filterExprs,
      List<Integer> filterList,
      List<RexLiteral> literals,
      List<CompOperatorEnum> op) {
    SargFactory sargFactory = new SargFactory(calcRel.getCluster().getRexBuilder());
    SargRexAnalyzer rexAnalyzer = sargFactory.newRexAnalyzer(true);
    List<SargBinding> sargBindingList = rexAnalyzer.analyzeAll(filterExprs);

    // Currently, it's all or nothing.  So, if there are filters rejected
    // by the analyzer, we can't process a subset using the reshape
    // exec stream
    if (rexAnalyzer.getNonSargFilterRexNode() != null) {
      return false;
    }

    List<RexInputRef> filterCols = new ArrayList<RexInputRef>();
    List<RexNode> filterOperands = new ArrayList<RexNode>();
    if (FennelRelUtil.extractSimplePredicates(sargBindingList, filterCols, filterOperands, op)) {
      for (RexInputRef filterCol : filterCols) {
        filterList.add(filterCol.getIndex());
      }
      for (RexNode operand : filterOperands) {
        literals.add((RexLiteral) operand);
      }
      return true;
    } else {
      return false;
    }
  }
  /**
   * Determines if a projection is simple.
   *
   * @param calcRel CalcRel containing the projection
   * @param projOrdinals if the projection is simple, returns the ordinals of the projection inputs
   * @return rowtype corresponding to the projection, provided it is simple; otherwise null is
   *     returned
   */
  private RelDataType isProjectSimple(CalcRel calcRel, List<Integer> projOrdinals) {
    // Loop through projection expressions.  If we find a non-simple
    // projection expression, simply return.
    RexProgram program = calcRel.getProgram();
    List<RexLocalRef> projList = program.getProjectList();
    int nProjExprs = projList.size();
    RelDataType[] types = new RelDataType[nProjExprs];
    String[] fieldNames = new String[nProjExprs];
    RelDataTypeField[] projFields = calcRel.getRowType().getFields();

    for (int i = 0; i < nProjExprs; i++) {
      RexNode projExpr = program.expandLocalRef(projList.get(i));
      if (projExpr instanceof RexInputRef) {
        projOrdinals.add(((RexInputRef) projExpr).getIndex());
        types[i] = projExpr.getType();
        fieldNames[i] = projFields[i].getName();
        continue;
      } else if (!(projExpr instanceof RexCall)) {
        return null;
      }

      RexCall rexCall = (RexCall) projExpr;
      if (rexCall.getOperator() != SqlStdOperatorTable.castFunc) {
        return null;
      }
      RexNode castOperand = rexCall.getOperands()[0];
      if (!(castOperand instanceof RexInputRef)) {
        return null;
      }
      RelDataType castType = projExpr.getType();
      RelDataType origType = castOperand.getType();
      if (isCastSimple(origType, castType)) {
        projOrdinals.add(((RexInputRef) castOperand).getIndex());
        types[i] = castType;
        fieldNames[i] = projFields[i].getName();
      } else {
        return null;
      }
    }

    // return the rowtype corresponding to the output of the projection
    return calcRel.getCluster().getTypeFactory().createStructType(types, fieldNames);
  }
Пример #5
0
  /**
   * Variant of {@link #trimFields(RelNode, BitSet, Set)} for {@link SetOpRel} (including UNION and
   * UNION ALL).
   */
  public TrimResult trimFields(
      SetOpRel setOp, BitSet fieldsUsed, Set<RelDataTypeField> extraFields) {
    final RelDataType rowType = setOp.getRowType();
    final int fieldCount = rowType.getFieldCount();
    int changeCount = 0;

    // Fennel abhors an empty row type, so pretend that the parent rel
    // wants the last field. (The last field is the least likely to be a
    // system field.)
    if (fieldsUsed.isEmpty()) {
      fieldsUsed.set(rowType.getFieldCount() - 1);
    }

    // Compute the desired field mapping. Give the consumer the fields they
    // want, in the order that they appear in the bitset.
    final Mapping mapping = createMapping(fieldsUsed, fieldCount);

    // Create input with trimmed columns.
    final List<RelNode> newInputs = new ArrayList<RelNode>();
    for (RelNode input : setOp.getInputs()) {
      TrimResult trimResult = trimChild(setOp, input, fieldsUsed, extraFields);
      RelNode newInput = trimResult.left;
      final Mapping inputMapping = trimResult.right;

      // We want "mapping", the input gave us "inputMapping", compute
      // "remaining" mapping.
      //    |                   |                |
      //    |---------------- mapping ---------->|
      //    |-- inputMapping -->|                |
      //    |                   |-- remaining -->|
      //
      // For instance, suppose we have columns [a, b, c, d],
      // the consumer asked for mapping = [b, d],
      // and the transformed input has columns inputMapping = [d, a, b].
      // remaining will permute [b, d] to [d, a, b].
      Mapping remaining = Mappings.divide(mapping, inputMapping);

      // Create a projection; does nothing if remaining is identity.
      newInput = CalcRel.projectMapping(newInput, remaining, null);

      if (input != newInput) {
        ++changeCount;
      }
      newInputs.add(newInput);
    }

    // If the input is unchanged, and we need to project all columns,
    // there's to do.
    if (changeCount == 0 && mapping.isIdentity()) {
      return new TrimResult(setOp, mapping);
    }

    RelNode newSetOp = setOp.copy(setOp.getTraitSet(), newInputs);
    return new TrimResult(newSetOp, mapping);
  }
Пример #6
0
  public static RelNode createProject(final RelNode child, final List<Integer> posList) {
    return CalcRel.createProject(
        child,
        new AbstractList<RexNode>() {
          public int size() {
            return posList.size();
          }

          public RexNode get(int index) {
            final int pos = posList.get(index);
            return child
                .getCluster()
                .getRexBuilder()
                .makeInputRef(child.getRowType().getFieldList().get(pos).getType(), pos);
          }
        },
        null);
  }
        public void onMatch(RelOptRuleCall call) {
          FilterRel filter = (FilterRel) call.rels[0];
          List<RexNode> expList = new ArrayList<RexNode>(Arrays.asList(filter.getChildExps()));
          RexNode newConditionExp;
          boolean reduced;
          if (reduceExpressions(filter, expList)) {
            assert (expList.size() == 1);
            newConditionExp = expList.get(0);
            reduced = true;
          } else {
            // No reduction, but let's still test the original
            // predicate to see if it was already a constant,
            // in which case we don't need any runtime decision
            // about filtering.
            newConditionExp = filter.getChildExps()[0];
            reduced = false;
          }
          if (newConditionExp.isAlwaysTrue()) {
            call.transformTo(filter.getChild());
          } else if ((newConditionExp instanceof RexLiteral)
              || RexUtil.isNullLiteral(newConditionExp, true)) {
            call.transformTo(new EmptyRel(filter.getCluster(), filter.getRowType()));
          } else if (reduced) {
            call.transformTo(CalcRel.createFilter(filter.getChild(), expList.get(0)));
          } else {
            if (newConditionExp instanceof RexCall) {
              RexCall rexCall = (RexCall) newConditionExp;
              boolean reverse = (rexCall.getOperator() == SqlStdOperatorTable.notOperator);
              if (reverse) {
                rexCall = (RexCall) rexCall.getOperands()[0];
              }
              reduceNotNullableFilter(call, filter, rexCall, reverse);
            }
            return;
          }

          // New plan is absolutely better than old plan.
          call.getPlanner().setImportance(filter, 0.0);
        }
Пример #8
0
 /**
  * Trims a child relational expression, then adds back a dummy project to restore the fields that
  * were removed.
  *
  * <p>Sounds pointless? It causes unused fields to be removed further down the tree (towards the
  * leaves), but it ensure that the consuming relational expression continues to see the same
  * fields.
  *
  * @param rel Relational expression
  * @param input Input relational expression, whose fields to trim
  * @param fieldsUsed Bitmap of fields needed by the consumer
  * @return New relational expression and its field mapping
  */
 protected TrimResult trimChildRestore(
     RelNode rel, RelNode input, BitSet fieldsUsed, Set<RelDataTypeField> extraFields) {
   TrimResult trimResult = trimChild(rel, input, fieldsUsed, extraFields);
   if (trimResult.right.isIdentity()) {
     return trimResult;
   }
   final RelDataType rowType = input.getRowType();
   List<RelDataTypeField> fieldList = rowType.getFieldList();
   final List<RexNode> exprList = new ArrayList<RexNode>();
   final List<String> nameList = rowType.getFieldNames();
   RexBuilder rexBuilder = rel.getCluster().getRexBuilder();
   assert trimResult.right.getSourceCount() == fieldList.size();
   for (int i = 0; i < fieldList.size(); i++) {
     int source = trimResult.right.getTargetOpt(i);
     RelDataTypeField field = fieldList.get(i);
     exprList.add(
         source < 0
             ? rexBuilder.makeZeroLiteral(field.getType())
             : rexBuilder.makeInputRef(field.getType(), source));
   }
   RelNode project = CalcRel.createProject(trimResult.left, exprList, nameList);
   return new TrimResult(project, Mappings.createIdentity(fieldList.size()));
 }
  /**
   * Creates new RelNodes replacing/removing the original project/row scan
   *
   * @param projectedScan new scan that is now projected
   * @param origProject original projection
   * @param needRename true if fields from the row scan need to be renamed
   * @param newProject projection that contains the new projection expressions, in the case where
   *     the original projection cannot be removed because it projects expressions
   * @return new RelNode
   */
  public RelNode createNewRelNode(
      RelNode projectedScan, ProjectRel origProject, boolean needRename, ProjectRel newProject) {
    RelNode scanRel;
    if (needRename) {
      // Replace calling convention with FENNEL_EXEC_CONVENTION
      RelTraitSet traits = RelOptUtil.clone(origProject.getTraits());
      traits.setTrait(CallingConventionTraitDef.instance, FennelRel.FENNEL_EXEC_CONVENTION);
      if (!traits.equals(projectedScan.getTraits())) {
        RelNode mergedProjectedScan = convert(projectedScan, traits);
        RelOptPlanner planner = projectedScan.getCluster().getPlanner();
        // register projectedScan == mergedProjectedScan
        // so mergedProjectedScan will have a set later on
        projectedScan = planner.ensureRegistered(mergedProjectedScan, projectedScan);
      }
      scanRel =
          new FennelRenameRel(
              origProject.getCluster(),
              projectedScan,
              RelOptUtil.getFieldNames(origProject.getRowType()),
              traits);
    } else {
      scanRel = projectedScan;
    }

    if (newProject == null) {
      return scanRel;
    } else {
      // in the case where the projection had expressions, put the
      // new, modified projection on top of the projected row scan
      return (ProjectRel)
          CalcRel.createProject(
              scanRel,
              newProject.getProjectExps(),
              RelOptUtil.getFieldNames(newProject.getRowType()));
    }
  }
 protected void executeImpl() throws Exception {
   RelNode oneRowRel = new OneRowRel(getPreparingStmt().getRelOptCluster());
   RelNode projectRel = CalcRel.createProject(oneRowRel, exprs, null);
   executePlan(projectRel, exprs, false, true);
 }
        public void onMatch(RelOptRuleCall call) {
          CalcRel calc = (CalcRel) call.getRels()[0];
          RexProgram program = calc.getProgram();
          final List<RexNode> exprList = program.getExprList();

          // Form a list of expressions with sub-expressions fully
          // expanded.
          final List<RexNode> expandedExprList = new ArrayList<RexNode>(exprList.size());
          final RexShuttle shuttle =
              new RexShuttle() {
                public RexNode visitLocalRef(RexLocalRef localRef) {
                  return expandedExprList.get(localRef.getIndex());
                }
              };
          for (RexNode expr : exprList) {
            expandedExprList.add(expr.accept(shuttle));
          }
          if (reduceExpressions(calc, expandedExprList)) {
            final RexProgramBuilder builder =
                new RexProgramBuilder(
                    calc.getChild().getRowType(), calc.getCluster().getRexBuilder());
            List<RexLocalRef> list = new ArrayList<RexLocalRef>();
            for (RexNode expr : expandedExprList) {
              list.add(builder.registerInput(expr));
            }
            if (program.getCondition() != null) {
              final int conditionIndex = program.getCondition().getIndex();
              final RexNode newConditionExp = expandedExprList.get(conditionIndex);
              if (newConditionExp.isAlwaysTrue()) {
                // condition is always TRUE - drop it
              } else if ((newConditionExp instanceof RexLiteral)
                  || RexUtil.isNullLiteral(newConditionExp, true)) {
                // condition is always NULL or FALSE - replace calc
                // with empty
                call.transformTo(new EmptyRel(calc.getCluster(), calc.getRowType()));
                return;
              } else {
                builder.addCondition(list.get(conditionIndex));
              }
            }
            int k = 0;
            for (RexLocalRef projectExpr : program.getProjectList()) {
              final int index = projectExpr.getIndex();
              builder.addProject(
                  list.get(index).getIndex(),
                  program.getOutputRowType().getFieldList().get(k++).getName());
            }
            call.transformTo(
                new CalcRel(
                    calc.getCluster(),
                    calc.getTraits(),
                    calc.getChild(),
                    calc.getRowType(),
                    builder.getProgram(),
                    calc.getCollationList()));

            // New plan is absolutely better than old plan.
            call.getPlanner().setImportance(calc, 0.0);
          }
        }