예제 #1
0
 /**
  * Returns the index of the first field in <code>rel</code> which comes from its <code>ordinal
  * </code>th input.
  *
  * <p>For example, if rel joins T0(A,B,C) to T1(D,E), then countFields(0,rel) yields 0, and
  * countFields(1,rel) yields 3.
  */
 private int computeFieldOffset(RelNode rel, int ordinal) {
   if (ordinal == 0) {
     // short-circuit for the common case
     return 0;
   }
   int fieldOffset = 0;
   final List<RelNode> inputs = rel.getInputs();
   for (int i = 0; i < ordinal; i++) {
     RelNode input = inputs.get(i);
     fieldOffset += input.getRowType().getFieldList().size();
   }
   return fieldOffset;
 }
예제 #2
0
 /**
  * Returns the variable which, in the generated program, will hold the current row of a given
  * relational expression. This method is only applicable if the relational expression is the
  * current one or an input; if it is an ancestor, there is no current value, and this method
  * returns null.
  */
 public Variable findInputVariable(RelNode rel) {
   while (true) {
     JavaFrame frame = (JavaFrame) mapRel2Frame.get(rel);
     if ((frame != null) && frame.hasVariable()) {
       return frame.getVariable();
     }
     List<RelNode> inputs = rel.getInputs();
     if (inputs.size() == 1) {
       rel = inputs.get(0);
     } else {
       return null;
     }
   }
 }
예제 #3
0
    private JavaFrame findFrame() {
      RelNode previous = rel;
      while (true) {
        JavaFrame frame = (JavaFrame) mapRel2Frame.get(previous);
        if (frame.bind != null) {
          tracer.log(
              Level.FINE,
              "Bind " + rel.toString() + " to " + previous.toString() + "(" + frame.bind + ")");
          return frame;
        }

        // go deeper
        List<RelNode> inputs = previous.getInputs();
        assert (inputs.size() == 1) : "input is not bound";
        previous = inputs.get(0);
      }
    }
  protected void explain_(RelNode rel, List<Pair<String, Object>> values) {
    final Map<String, Object> map = jsonBuilder.map();

    map.put("id", null); // ensure that id is the first attribute
    map.put("relOp", relJson.classToTypeName(rel.getClass()));
    for (Pair<String, Object> value : values) {
      if (value.right instanceof RelNode) {
        continue;
      }
      put(map, value.left, value.right);
    }
    // omit 'inputs: ["3"]' if "3" is the preceding rel
    final List<Object> list = explainInputs(rel.getInputs());
    if (list.size() != 1 || !list.get(0).equals(previousId)) {
      map.put("inputs", list);
    }

    final String id = Integer.toString(relIdMap.size());
    relIdMap.put(rel, id);
    map.put("id", id);

    relList.add(map);
    previousId = id;
  }