Examples with PassThroughPredicate edu.uci.ics.texera.textql.planbuilder.beans.PassThroughPredicate used on opensource projects

Example 1 with PassThroughPredicate

use of edu.uci.ics.texera.textql.planbuilder.beans.PassThroughPredicate in project textdb by TextDB.

the class SelectStatement method getInternalOperatorBeans.

/**
 * Return a list of operators generated when this statement is converted to beans.
 * Beans will be generated for the Alias, Projection, Extraction and Source operators.
 * @return The list of operator beans generated by this statement.
 */
@Override
public List<PredicateBase> getInternalOperatorBeans() {
    List<PredicateBase> operators = new ArrayList<>();
    // Build and append a PassThroughBean as an alias for this Statement
    operators.add(new PassThroughPredicate(getOutputNodeID()));
    // Build and append bean for Projection
    if (this.projectPredicate == null) {
        operators.add(new PassThroughPredicate(getProjectionNodeID()));
    } else {
        operators.add(this.projectPredicate.generateOperatorBean(getProjectionNodeID()));
    }
    // Build and append bean for Extraction predicate
    if (this.extractPredicate == null) {
        operators.add(new PassThroughPredicate(getExtractionNodeID()));
    } else {
        operators.add(this.extractPredicate.generateOperatorBean(getExtractionNodeID()));
    }
    // Build and append bean for the Source
    operators.add(new PassThroughPredicate(getInputNodeID()));
    // return the built operators
    return operators;
}

Example 2 with PassThroughPredicate

use of edu.uci.ics.texera.textql.planbuilder.beans.PassThroughPredicate in project textdb by TextDB.

the class StatementTestUtils method assertGeneratedBeans.

/**
 * Assert the generated beans by a statement are a valid direct acyclic graph (no cycles nor unreached nodes/links
 * are present) and that the given list of operators are present in the right order in the path from the initial
 * node to the final node (while ignoring the PassThroughBean and the value of the ID).
 * The following checks are performed:
 * -Check whether all the build operators have unique IDs (between them).
 * -Check whether the generated links are unique (no duplicate links).
 * -Check whether a path from the initial to the final node exists.
 * -Check whether all the operators in the path between the initial and the final node is are present in
 *     expectedOperators in the same order (ignoring the PassThroughBean)
 * -Check whether all the links connect existing operators.
 * -Check whether all the operator beans are visited once at most (no cycles).
 * -Check whether all the link beans are visited once at most (no cycles).
 * -Check whether all the operators, except for the final operator, have output arity equals to one.
 * -Check whether all the operators beans generated are reachable.
 * -Check whether all the link beans generated are reachable.
 *
 * @param statement The statement to build the beans to be checked.
 * @param expectedOperators The list of the expected OperatorBeans to be build by the statement.
 */
public static void assertGeneratedBeans(Statement statement, List<PredicateBase> expectedOperators) {
    // Get operators and links from statement
    List<PredicateBase> operators = statement.getInternalOperatorBeans();
    List<OperatorLink> links = statement.getInternalLinkBeans();
    // Assert all statements have an unique id (check whether two operators have the same ID)
    boolean uniqueIds = operators.stream().collect(Collectors.groupingBy(op -> op.getID(), Collectors.counting())).values().stream().allMatch(count -> (count == 1));
    Assert.assertTrue(uniqueIds);
    // Iterate the graph (string of nodes) to look for the expected beans
    HashSet<PredicateBase> visitedOperators = new HashSet<>();
    HashSet<OperatorLink> visitedLinks = new HashSet<>();
    String initialNode = statement.getInputNodeID();
    String finalNode = statement.getOutputNodeID();
    Iterator<PredicateBase> expectedOperatorsIterator = expectedOperators.iterator();
    PredicateBase nextExpectedOperator = null;
    // Start from the initial node and stop when the final node is reached (or an Assert fail)
    String currentBeanId = initialNode;
    while (true) {
        // Get the next expected operator to find (if needed)
        if (nextExpectedOperator == null && expectedOperatorsIterator.hasNext()) {
            nextExpectedOperator = expectedOperatorsIterator.next();
        }
        // Get the current bean by ID
        String currentLookingBeanId = currentBeanId;
        PredicateBase currentOperatorBean = operators.stream().filter(op -> op.getID().equals(currentLookingBeanId)).findAny().orElse(null);
        Assert.assertNotNull(currentOperatorBean);
        // Add the current visited bean to the set of visited beans and assert it hasn't been visited yet (cycle check)
        Assert.assertTrue(visitedOperators.add(currentOperatorBean));
        // Compare the current bean with the next expected bean
        if (nextExpectedOperator != null && currentOperatorBean.getClass() == nextExpectedOperator.getClass()) {
            // Copy the id of the current bean to the bean we are looking for and assert they are equal
            nextExpectedOperator.setID(currentOperatorBean.getID());
            Assert.assertEquals(nextExpectedOperator, currentOperatorBean);
            nextExpectedOperator = null;
        } else if (!(currentOperatorBean instanceof PassThroughPredicate)) {
            // Found a bean that is not PassThrough and is not the expected operator!
            Assert.fail();
        }
        // Break once the final node is visited
        if (currentBeanId.equals(finalNode)) {
            break;
        }
        // Get outgoing links for the current bean
        List<OperatorLink> currentOperatorBeanOutgoingLinks = links.stream().filter(link -> link.getOrigin().equals(currentOperatorBean.getID())).collect(Collectors.toList());
        // Assert there is only one outgoing link
        Assert.assertEquals(currentOperatorBeanOutgoingLinks.size(), 1);
        OperatorLink currentOperatorBeanOutgoingLink = currentOperatorBeanOutgoingLinks.get(0);
        // Add the outgoing link to the set of visited links and assert it hasn't been visited yet (cycle and duplicate check)
        Assert.assertTrue(visitedLinks.add(currentOperatorBeanOutgoingLink));
        // Set the current bean id to the next bean
        currentBeanId = currentOperatorBeanOutgoingLink.getDestination();
    }
    // Assert there are no more expected operators to look for
    Assert.assertFalse(expectedOperatorsIterator.hasNext());
    // Assert all the operators generated by the statement are visited (no unreachable operators)
    Assert.assertTrue(visitedOperators.containsAll(operators));
    // Assert all the links generated by the statement are visited (no unreachable links)
    Assert.assertTrue(visitedLinks.containsAll(links));
}

Example 3 with PassThroughPredicate

use of edu.uci.ics.texera.textql.planbuilder.beans.PassThroughPredicate in project textdb by TextDB.

the class ProjectAllFieldsPredicateTest method testGenerateOperatorBean.

/**
 * Test the generateOperatorBean method.
 * Build a SelectAllFieldsPredicate, invoke the generateOperatorBean and check
 * whether a PassThroughBean with the right attributes is returned.
 */
@Test
public void testGenerateOperatorBean() {
    ProjectAllFieldsPredicate projectAllFieldsPredicate = new ProjectAllFieldsPredicate();
    PredicateBase projectionBean;
    final String operatorId1 = "xxx";
    projectionBean = projectAllFieldsPredicate.generateOperatorBean(operatorId1);
    Assert.assertEquals(projectionBean, new PassThroughPredicate(operatorId1));
    final String operatorId2 = "y0a9";
    projectionBean = projectAllFieldsPredicate.generateOperatorBean(operatorId2);
    Assert.assertEquals(projectionBean, new PassThroughPredicate(operatorId2));
}