Example #1
  * Burrows into a synthetic record and returns the underlying relation which provides the field
  * called <code>fieldName</code>.
 public JavaRel implementFieldAccess(JavaRelImplementor implementor, String fieldName) {
   if (!isBoxed()) {
     return implementor.implementFieldAccess((JavaRel) getChild(), fieldName);
   RelDataType type = getRowType();
   int field = type.getFieldOrdinal(fieldName);
   RexLocalRef ref = program.getProjectList().get(field);
   final int index = ref.getIndex();
   return implementor.findRel((JavaRel) this, program.getExprList().get(index));
Example #2
  public ParseTree implement(JavaRelImplementor implementor) {
    Expression childExp = implementor.visitJavaChild(this, 0, (JavaRel) getChild());
    RelDataType outputRowType = getRowType();
    RelDataType inputRowType = getChild().getRowType();

    Variable varInputRow = implementor.newVariable();
    implementor.bind(getChild(), varInputRow);

    return implementAbstract(
        implementor, this, childExp, varInputRow, inputRowType, outputRowType, program, tag);
Example #3
   * Generates code for a Java expression satisfying the {@link org.eigenbase.runtime.TupleIter}
   * interface. The generated code allocates a {@link org.eigenbase.runtime.CalcTupleIter} with a
   * dynamic {@link org.eigenbase.runtime.TupleIter#fetchNext()} method. If the "abort on error"
   * flag is false, or an error handling tag is specified, then fetchNext is written to handle row
   * errors.
   * <p>Row errors are handled by wrapping expressions that can fail with a try/catch block. A
   * caught RuntimeException is then published to an "connection variable." In the event that errors
   * can overflow, an "error buffering" flag allows them to be posted again on the next iteration of
   * fetchNext.
   * @param implementor an object that implements relations as Java code
   * @param rel the relation to be implemented
   * @param childExp the implemented child of the relation
   * @param varInputRow the Java variable to use for the input row
   * @param inputRowType the rel data type of the input row
   * @param outputRowType the rel data type of the output row
   * @param program the rex program to implemented by the relation
   * @param tag an error handling tag
   * @return a Java expression satisfying the TupleIter interface
  public static Expression implementAbstractTupleIter(
      JavaRelImplementor implementor,
      JavaRel rel,
      Expression childExp,
      Variable varInputRow,
      final RelDataType inputRowType,
      final RelDataType outputRowType,
      RexProgram program,
      String tag) {
    MemberDeclarationList memberList = new MemberDeclarationList();

    // Perform error recovery if continuing on errors or if
    // an error handling tag has been specified
    boolean errorRecovery = !abortOnError || (tag != null);

    // Error buffering should not be enabled unless error recovery is
    assert !errorBuffering || errorRecovery;

    // Allow backwards compatibility until all Farrago extensions are
    // satisfied with the new error handling semantics. The new semantics
    // include:
    //   (1) cast input object to input row object outside of try block,
    //         should be fine, at least for base Farrago
    //   (2) maintain a columnIndex counter to better locate of error,
    //         at the cost of a few cycles
    //   (3) publish errors to the runtime context. FarragoRuntimeContext
    //         now supports this API
    boolean backwardsCompatible = true;
    if (tag != null) {
      backwardsCompatible = false;

    RelDataTypeFactory typeFactory = implementor.getTypeFactory();
    OJClass outputRowClass = OJUtil.typeToOJClass(outputRowType, typeFactory);
    OJClass inputRowClass = OJUtil.typeToOJClass(inputRowType, typeFactory);

    Variable varOutputRow = implementor.newVariable();

    FieldDeclaration inputRowVarDecl =
        new FieldDeclaration(
            new ModifierList(ModifierList.PRIVATE),

    FieldDeclaration outputRowVarDecl =
        new FieldDeclaration(
            new ModifierList(ModifierList.PRIVATE),
            new AllocationExpression(outputRowClass, new ExpressionList()));

    // The method body for fetchNext, a main target of code generation
    StatementList nextMethodBody = new StatementList();

    // First, post an error if it overflowed the previous time
    //     if (pendingError) {
    //         rc = handleRowError(...);
    //         if (rc instanceof NoDataReason) {
    //             return rc;
    //         }
    //         pendingError = false;
    //     }
    if (errorBuffering) {
      // add to next method body...

    // Most of fetchNext falls within a while() block. The while block
    // allows us to try multiple input rows against a filter condition
    // before returning a single row.
    //     while (true) {
    //         Object varInputObj = inputIterator.fetchNext();
    //         if (varInputObj instanceof TupleIter.NoDataReason) {
    //             return varInputObj;
    //         }
    //         varInputRow = (InputRowClass) varInputObj;
    //         int columnIndex = 0;
    //         [calculation statements]
    //     }
    StatementList whileBody = new StatementList();

    Variable varInputObj = implementor.newVariable();

        new VariableDeclaration(
            new MethodCall(new FieldAccess("inputIterator"), "fetchNext", new ExpressionList())));

    StatementList ifNoDataReasonBody = new StatementList();

        new IfStatement(
            new InstanceofExpression(
                varInputObj, OJUtil.typeNameForClass(TupleIter.NoDataReason.class)),

    ifNoDataReasonBody.add(new ReturnStatement(varInputObj));

    // Push up the row declaration for new error handling so that the
    // input row is available to the error handler
    if (!backwardsCompatible) {
      whileBody.add(assignInputRow(inputRowClass, varInputRow, varInputObj));

    Variable varColumnIndex = null;
    if (errorRecovery && !backwardsCompatible) {
      // NOTE jvs 7-Oct-2006:  Declare varColumnIndex as a member
      // (rather than a local) in case in the future we want
      // to decompose complex expressions into helper methods.
      varColumnIndex = implementor.newVariable();
      FieldDeclaration varColumnIndexDecl =
          new FieldDeclaration(
              new ModifierList(ModifierList.PRIVATE),
          new ExpressionStatement(
              new AssignmentExpression(
                  varColumnIndex, AssignmentExpression.EQUALS, Literal.makeLiteral(0))));

    // Calculator (projection, filtering) statements are later appended
    // to calcStmts. Typically, this target will be the while list itself.
    StatementList calcStmts;
    if (!errorRecovery) {
      calcStmts = whileBody;
    } else {
      // For error recovery, we wrap the calc statements
      // (e.g., everything but the code that reads rows from the
      // inputIterator) in a try/catch that publishes exceptions.

      calcStmts = new StatementList();

      // try { /* calcStmts */ }
      // catch(RuntimeException ex) {
      //     Object rc = connection.handleRowError(...);
      //     [buffer error if necessary]
      // }
      StatementList catchStmts = new StatementList();

      if (backwardsCompatible) {
            new ExpressionStatement(
                new MethodCall(
                    new MethodCall(
                        OJUtil.typeNameForClass(EigenbaseTrace.class), "getStatementTracer", null),
                    new ExpressionList(
                        new FieldAccess(OJUtil.typeNameForClass(Level.class), "WARNING"),
                        Literal.makeLiteral("java calc exception"),
                        new FieldAccess("ex")))));
      } else {
        Variable varRc = implementor.newVariable();
        ExpressionList handleRowErrorArgs =
            new ExpressionList(varInputRow, new FieldAccess("ex"), varColumnIndex);
            new VariableDeclaration(
                new MethodCall(
                    implementor.getConnectionVariable(), "handleRowError", handleRowErrorArgs)));

        // Buffer an error if it overflowed
        //     if (rc instanceof NoDataReason) {
        //         pendingError = true;
        //         [save error state]
        //         return rc;
        //     }
        if (errorBuffering) {
          // add to catch statements...

      CatchList catchList =
          new CatchList(
              new CatchBlock(
                  new Parameter(OJUtil.typeNameForClass(RuntimeException.class), "ex"),

      TryStatement tryStmt = new TryStatement(calcStmts, catchList);


    if (backwardsCompatible) {
      calcStmts.add(assignInputRow(inputRowClass, varInputRow, varInputObj));

    StatementList condBody;
    RexToOJTranslator translator = implementor.newStmtTranslator(rel, calcStmts, memberList);
    try {
      if (program.getCondition() != null) {
        // TODO jvs 8-Oct-2006:  move condition to its own
        // method if big, as below for project exprs.
        condBody = new StatementList();
        RexNode rexIsTrue =
                .makeCall(SqlStdOperatorTable.isTrueOperator, program.getCondition());
        Expression conditionExp = translator.translateRexNode(rexIsTrue);
        calcStmts.add(new IfStatement(conditionExp, condBody));
      } else {
        condBody = calcStmts;

      RelDataTypeField[] fields = outputRowType.getFields();
      final List<RexLocalRef> projectRefList = program.getProjectList();
      int i = -1;
      for (RexLocalRef rhs : projectRefList) {

        // NOTE jvs 14-Sept-2006:  Put complicated project expressions
        // into their own method, otherwise a big select list can easily
        // blow the 64K Java limit on method bytecode size.  Make
        // methods private final in the hopes that they will get inlined
        // JIT.  For now we decide "complicated" based on the size of
        // the generated Java parse tree. A big enough select list of
        // simple expressions could still blow the limit, so we may need
        // to group them together, sub-divide, etc.

        StatementList projMethodBody = new StatementList();

        if (errorRecovery && !backwardsCompatible) {
              new ExpressionStatement(
                  new UnaryExpression(varColumnIndex, UnaryExpression.POST_INCREMENT)));

        RexToOJTranslator projTranslator = translator.push(projMethodBody);
        String javaFieldName = Util.toJavaId(fields[i].getName(), i);
        Expression lhs = new FieldAccess(varOutputRow, javaFieldName);
        projTranslator.translateAssignment(fields[i], lhs, rhs);

        int complexity = OJUtil.countParseTreeNodes(projMethodBody);

        // REVIEW: HCP 5/18/2011
        // The projMethod should be checked
        // for causing possible compiler errors caused by the use of
        // variables declared in other projMethods.  Also the
        // local declaration of variabled used by other proj methods
        // should also be checked.

        // Fixing for backswing integration 14270
        // TODO: check if abstracting this method body will cause
        // a compiler error
        if (true) {
          // No method needed; just append.

        // Need a separate method.

        String projMethodName = "calc_" + varOutputRow.toString() + "_f_" + i;
        MemberDeclaration projMethodDecl =
            new MethodDeclaration(
                new ModifierList(ModifierList.PRIVATE | ModifierList.FINAL),
                new ParameterList(),
        condBody.add(new ExpressionStatement(new MethodCall(projMethodName, new ExpressionList())));
    } finally {

    condBody.add(new ReturnStatement(varOutputRow));

    WhileStatement whileStmt = new WhileStatement(Literal.makeLiteral(true), whileBody);


    MemberDeclaration fetchNextMethodDecl =
        new MethodDeclaration(
            new ModifierList(ModifierList.PUBLIC),
            new ParameterList(),

    // The restart() method should reset variables used to buffer errors
    //     pendingError = false
    if (errorBuffering) {
      // declare refinement of restart() and add to member list...

    Expression newTupleIterExp =
        new AllocationExpression(
            OJUtil.typeNameForClass(CalcTupleIter.class), new ExpressionList(childExp), memberList);

    return newTupleIterExp;