Examples with PushDataSourceOperator io.confluent.ksql.physical.scalablepush.operators.PushDataSourceOperator used on opensource projects

Example 1 with PushDataSourceOperator

use of io.confluent.ksql.physical.scalablepush.operators.PushDataSourceOperator in project ksql by confluentinc.

the class PushPhysicalPlanBuilder method buildPushPhysicalPlan.

/**
 * Visits the logical plan top-down to build the physical plan.
 * @param logicalPlanNode the logical plan root node
 * @return the root node of the tree of physical operators
 */
public PushPhysicalPlan buildPushPhysicalPlan(final LogicalPlanNode logicalPlanNode, final Context context, final Optional<PushOffsetRange> offsetRange, final Optional<String> catchupConsumerGroup) {
    final String catchupConsumerGroupId = getConsumerGroupId(catchupConsumerGroup);
    PushDataSourceOperator dataSourceOperator = null;
    final OutputNode outputNode = logicalPlanNode.getNode().orElseThrow(() -> new IllegalArgumentException("Need an output node to build a plan"));
    if (!(outputNode instanceof KsqlBareOutputNode)) {
        throw new KsqlException("Push queries expect the root of the logical plan to be a " + "KsqlBareOutputNode.");
    }
    // We skip KsqlBareOutputNode in the translation since it only applies the LIMIT
    PlanNode currentLogicalNode = outputNode.getSource();
    AbstractPhysicalOperator prevPhysicalOp = null;
    AbstractPhysicalOperator rootPhysicalOp = null;
    while (true) {
        AbstractPhysicalOperator currentPhysicalOp = null;
        if (currentLogicalNode instanceof QueryProjectNode) {
            currentPhysicalOp = translateProjectNode((QueryProjectNode) currentLogicalNode);
        } else if (currentLogicalNode instanceof QueryFilterNode) {
            currentPhysicalOp = translateFilterNode((QueryFilterNode) currentLogicalNode);
        } else if (currentLogicalNode instanceof DataSourceNode) {
            currentPhysicalOp = translateDataSourceNode((DataSourceNode) currentLogicalNode, offsetRange, catchupConsumerGroupId);
            dataSourceOperator = (PushDataSourceOperator) currentPhysicalOp;
        } else {
            throw new KsqlException(String.format("Error in translating logical to physical plan for scalable push queries:" + " unrecognized logical node %s.", currentLogicalNode));
        }
        if (prevPhysicalOp == null) {
            rootPhysicalOp = currentPhysicalOp;
        } else {
            prevPhysicalOp.addChild(currentPhysicalOp);
        }
        prevPhysicalOp = currentPhysicalOp;
        // Exit the loop when a leaf node is reached
        if (currentLogicalNode.getSources().isEmpty()) {
            break;
        }
        if (currentLogicalNode.getSources().size() > 1) {
            throw new KsqlException("Push queries do not support joins or nested sub-queries yet.");
        }
        currentLogicalNode = currentLogicalNode.getSources().get(0);
    }
    if (dataSourceOperator == null) {
        throw new IllegalStateException("DataSourceOperator cannot be null in Push physical plan");
    }
    return new PushPhysicalPlan(rootPhysicalOp, (rootPhysicalOp).getLogicalNode().getSchema(), queryId, catchupConsumerGroupId, dataSourceOperator.getScalablePushRegistry(), dataSourceOperator, context, querySourceType);
}