org.apache.kylin.query.optrule.OLAPProjectRule Maven / Gradle / Ivy

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 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
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 * 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
 * 
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package org.apache.kylin.query.optrule;

import org.apache.calcite.plan.RelOptRule;
import org.apache.calcite.plan.RelOptRuleCall;
import org.apache.calcite.plan.RelTraitSet;
import org.apache.calcite.rel.logical.LogicalProject;
import org.apache.kylin.query.relnode.OLAPProjectRel;
import org.apache.kylin.query.relnode.OLAPRel;

/**
 */
public class OLAPProjectRule extends RelOptRule {

    public static final RelOptRule INSTANCE = new OLAPProjectRule();

    public OLAPProjectRule() {
        super(operand(LogicalProject.class, any()));
    }

    @Override
    public void onMatch(RelOptRuleCall call) {
        LogicalProject project = call.rel(0);

        RelTraitSet origTraitSet = project.getTraitSet();
        RelTraitSet traitSet = origTraitSet.replace(OLAPRel.CONVENTION).simplify();

        OLAPProjectRel olapProj = new OLAPProjectRel(project.getCluster(), traitSet, //
                convert(project.getInput(), traitSet), project.getProjects(), project.getRowType());
        call.transformTo(olapProj);
    }

}