org.apache.drill.optiq.DrillImplementor.java Source code

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Here is the source code for org.apache.drill.optiq.DrillImplementor.java

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 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
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package org.apache.drill.optiq;

import org.apache.drill.exec.ref.rse.QueueRSE.QueueOutputInfo;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;

/**
 * Context for converting a tree of {@link DrillRel} nodes into a Drill logical
 * plan.
 */
public class DrillImplementor {
    final ObjectMapper mapper = new ObjectMapper();
    {
        mapper.enable(SerializationFeature.INDENT_OUTPUT);
        mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
        mapper.configure(JsonParser.Feature.ALLOW_COMMENTS, true);
    }
    private final ObjectNode rootNode = mapper.createObjectNode();
    private final ArrayNode operatorsNode;

    public DrillImplementor() {
        final ObjectNode headNode = mapper.createObjectNode();
        rootNode.put("head", headNode);
        headNode.put("type", "apache_drill_logical_plan");
        headNode.put("version", "1");

        final ObjectNode generatorNode = mapper.createObjectNode();
        headNode.put("generator", generatorNode);
        generatorNode.put("type", "manual");
        generatorNode.put("info", "na");

        // TODO: populate sources based on the sources of scans that occur in
        // the query
        final ArrayNode sourcesNode = mapper.createArrayNode();
        rootNode.put("storage", sourcesNode);

        // input file source
        {
            final ObjectNode sourceNode = mapper.createObjectNode();
            sourceNode.put("name", "donuts-json");
            sourceNode.put("type", "classpath");
            sourcesNode.add(sourceNode);
        }
        {
            final ObjectNode sourceNode = mapper.createObjectNode();
            sourceNode.put("name", "queue");
            sourceNode.put("type", "queue");
            sourcesNode.add(sourceNode);
        }

        final ArrayNode queryNode = mapper.createArrayNode();
        rootNode.put("query", queryNode);

        final ObjectNode sequenceOpNode = mapper.createObjectNode();
        queryNode.add(sequenceOpNode);
        sequenceOpNode.put("op", "sequence");

        this.operatorsNode = mapper.createArrayNode();
        sequenceOpNode.put("do", operatorsNode);
    }

    public void go(DrillRel root) {
        root.implement(this);

        // Add a last node, to write to the output queue.
        final ObjectNode writeOp = mapper.createObjectNode();
        writeOp.put("op", "store");
        writeOp.put("storageengine", "queue");
        writeOp.put("memo", "output sink");
        QueueOutputInfo output = new QueueOutputInfo();
        output.number = 0;
        writeOp.put("target", mapper.convertValue(output, JsonNode.class));
        add(writeOp);
    }

    public void add(ObjectNode operator) {
        operatorsNode.add(operator);
    }

    /** Returns the generated plan. */
    public String getJsonString() {
        String s = rootNode.toString();
        System.out.println(s);
        return s;
    }
}

// End DrillImplementor.java