Examples with CursorProcessorOutput com.facebook.presto.operator.project.CursorProcessorOutput used on opensource projects

Example 1 with CursorProcessorOutput

use of com.facebook.presto.operator.project.CursorProcessorOutput in project presto by prestodb.

the class CursorProcessorCompiler method generateProcessMethod.

private static void generateProcessMethod(ClassDefinition classDefinition, int projections, Map<VariableReferenceExpression, CommonSubExpressionFields> cseFields) {
    Parameter properties = arg("properties", SqlFunctionProperties.class);
    Parameter yieldSignal = arg("yieldSignal", DriverYieldSignal.class);
    Parameter cursor = arg("cursor", RecordCursor.class);
    Parameter pageBuilder = arg("pageBuilder", PageBuilder.class);
    MethodDefinition method = classDefinition.declareMethod(a(PUBLIC), "process", type(CursorProcessorOutput.class), properties, yieldSignal, cursor, pageBuilder);
    Scope scope = method.getScope();
    Variable completedPositionsVariable = scope.declareVariable(int.class, "completedPositions");
    Variable finishedVariable = scope.declareVariable(boolean.class, "finished");
    method.getBody().comment("int completedPositions = 0;").putVariable(completedPositionsVariable, 0).comment("boolean finished = false;").putVariable(finishedVariable, false);
    // while loop loop body
    LabelNode done = new LabelNode("done");
    BytecodeBlock whileFunctionBlock = new BytecodeBlock().comment("if (pageBuilder.isFull() || yieldSignal.isSet()) return new CursorProcessorOutput(completedPositions, false);").append(new IfStatement().condition(or(pageBuilder.invoke("isFull", boolean.class), yieldSignal.invoke("isSet", boolean.class))).ifTrue(jump(done))).comment("if (!cursor.advanceNextPosition()) return new CursorProcessorOutput(completedPositions, true);").append(new IfStatement().condition(cursor.invoke("advanceNextPosition", boolean.class)).ifFalse(new BytecodeBlock().putVariable(finishedVariable, true).gotoLabel(done)));
    // reset the CSE evaluatedField = false for every row
    cseFields.values().forEach(field -> whileFunctionBlock.append(scope.getThis().setField(field.getEvaluatedField(), constantBoolean(false))));
    whileFunctionBlock.comment("do the projection").append(createProjectIfStatement(classDefinition, method, properties, cursor, pageBuilder, projections)).comment("completedPositions++;").incrementVariable(completedPositionsVariable, (byte) 1);
    WhileLoop whileLoop = new WhileLoop().condition(constantTrue()).body(whileFunctionBlock);
    method.getBody().append(whileLoop).visitLabel(done).append(newInstance(CursorProcessorOutput.class, completedPositionsVariable, finishedVariable).ret());
}

Example 2 with CursorProcessorOutput

use of com.facebook.presto.operator.project.CursorProcessorOutput in project presto by prestodb.

the class ScanFilterAndProjectOperator method processColumnSource.

private Page processColumnSource() {
    DriverYieldSignal yieldSignal = operatorContext.getDriverContext().getYieldSignal();
    if (!finishing && !yieldSignal.isSet()) {
        CursorProcessorOutput output = cursorProcessor.process(sqlFunctionProperties, yieldSignal, cursor, pageBuilder);
        pageSourceMemoryContext.setBytes(cursor.getSystemMemoryUsage());
        recordCursorInputStats(output.getProcessedRows());
        if (output.isNoMoreRows()) {
            finishing = true;
            mergingOutput.finish();
        }
    }
    // only return a page if buffer is full or we are finishing
    Page page = null;
    if (!pageBuilder.isEmpty() && (finishing || pageBuilder.isFull())) {
        page = pageBuilder.build();
        pageBuilder.reset();
    }
    outputMemoryContext.setBytes(pageBuilder.getRetainedSizeInBytes());
    return page;
}