예제 #1
0
    // implement CallConvertlet
    public void convert(RexCall call) {
      // REVIEW jvs 18-Mar-2006:  The test for variableSeen
      // here and elsewhere precludes predicates like where
      // (boolean_col AND (int_col > 10)).  Should probably
      // support bare boolean columns as predicates with
      // coordinate TRUE.

      if (variableSeen || (coordinate != null)) {
        failed = true;
      }

      if (failed) {
        return;
      }

      int nOperands = call.getOperands().size();
      assert (exprStack.size() >= nOperands);

      SargSetExpr expr = factory.newSetExpr(boundInputRef.getType(), setOp);

      // Pop the correct number of operands off the stack
      // and transfer them to the new set expression.
      ListIterator<SargExpr> iter = exprStack.listIterator(exprStack.size() - nOperands);
      while (iter.hasNext()) {
        expr.addChild(iter.next());
        iter.remove();
      }

      exprStack.add(expr);
    }
예제 #2
0
  /** Reconstructs a rex predicate from a list of SargExprs which will be AND'ed together. */
  private void recomposeConjunction() {
    for (int i = 0; i < sargBindingList.size(); i++) {
      final SargBinding currBinding = sargBindingList.get(i);
      final RexInputRef currRef = currBinding.getInputRef();
      SargExpr currSargExpr = currBinding.getExpr();
      RexNode currAndNode = sarg2RexMap.get(currSargExpr);

      // don't need this anymore
      // will be have new mapping put back if currSargExpr remain
      // unchanged.
      sarg2RexMap.remove(currSargExpr);
      boolean recomp = false;

      // search the rest of the list to find SargExpr on the same col.
      ListIterator<SargBinding> iter = sargBindingList.listIterator(i + 1);

      while (iter.hasNext()) {
        final SargBinding nextBinding = iter.next();
        final RexInputRef nextRef = nextBinding.getInputRef();
        final SargExpr nextSargExpr = nextBinding.getExpr();

        if (nextRef.getIndex() == currRef.getIndex()) {
          // build new SargExpr
          SargSetExpr expr =
              factory.newSetExpr(currSargExpr.getDataType(), SargSetOperator.INTERSECTION);
          expr.addChild(currSargExpr);
          expr.addChild(nextSargExpr);

          // build new RexNode
          currAndNode =
              factory
                  .getRexBuilder()
                  .makeCall(
                      SqlStdOperatorTable.andOperator, currAndNode, sarg2RexMap.get(nextSargExpr));

          currSargExpr = expr;

          sarg2RexMap.remove(nextSargExpr);
          iter.remove();

          recomp = true;
        }
      }

      if (recomp) {
        assert !simpleMode;
        if (!testDynamicParamSupport(currSargExpr)) {
          // Oops, we can't actually support the conjunction we
          // recomposed.  Toss it.  (We could do a better job by at
          // least using part of it, but the effort might be better
          // spent on implementing deferred expression evaluation.)
          nonSargFilterList.add(currAndNode);
          sargBindingList.remove(i);
          continue;
        }
      }

      if (recomp) {
        SargBinding newBinding = new SargBinding(currSargExpr, currRef);
        sargBindingList.remove(i);
        sargBindingList.add(i, newBinding);
      }

      sarg2RexMap.put(currSargExpr, currAndNode);
    }
  }