Пример #1
0
  /**
   * Analyzes a rex predicate.
   *
   * @param rexPredicate predicate to be analyzed
   * @return a list of SargBindings contained in the input rex predicate
   */
  public List<SargBinding> analyzeAll(RexNode rexPredicate) {
    sargBindingList = new ArrayList<SargBinding>();
    sarg2RexMap = new HashMap<SargExpr, RexNode>();
    nonSargFilterList = new ArrayList<RexNode>();

    // Flatten out the RexNode tree into a list of terms that
    // are AND'ed together
    final List<RexNode> rexCFList = RelOptUtil.conjunctions(rexPredicate);

    // In simple mode, each input ref can only be referenced once, so
    // keep a list of them.  We also only allow one non-point expression.
    List<Integer> boundRefList = new ArrayList<Integer>();
    boolean rangeFound = false;

    for (RexNode rexPred : rexCFList) {
      final SargBinding sargBinding = analyze(rexPred);
      if (sargBinding != null) {
        if (simpleMode) {
          RexInputRef inputRef = sargBinding.getInputRef();
          if (boundRefList.contains(inputRef.getIndex())) {
            nonSargFilterList.add(rexPred);
            continue;
          } else {
            boundRefList.add(inputRef.getIndex());
          }
          SargIntervalSequence sargSeq = sargBinding.getExpr().evaluate();
          if (sargSeq.isRange()) {
            if (rangeFound) {
              nonSargFilterList.add(rexPred);
              continue;
            } else {
              rangeFound = true;
            }
          }
        }
        sargBindingList.add(sargBinding);
        sarg2RexMap.put(sargBinding.getExpr(), rexPred);
      } else {
        nonSargFilterList.add(rexPred);
      }
    }

    // Reset the state variables used during analyze, just for sanity sake.
    failed = false;
    boundInputRef = null;
    clearLeaf();

    // Combine the AND terms back together.
    recomposeConjunction();

    return sargBindingList;
  }
Пример #2
0
 public void setOrderBy(SqlNodeList nodeList) {
   assert clauses.contains(Clause.ORDER_BY);
   select.setOrderBy(nodeList);
 }
Пример #3
0
 public void setGroupBy(SqlNodeList nodeList) {
   assert clauses.contains(Clause.GROUP_BY);
   select.setGroupBy(nodeList);
 }
Пример #4
0
 public void setWhere(SqlNode node) {
   assert clauses.contains(Clause.WHERE);
   select.setWhere(node);
 }