io.druid.sql.calcite.rule.DruidTableScanRule Maven / Gradle / Ivy
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* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets 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 distributed under the License is distributed on an
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package io.druid.sql.calcite.rule;
import io.druid.sql.calcite.planner.PlannerContext;
import io.druid.sql.calcite.rel.DruidQueryRel;
import io.druid.sql.calcite.rel.QueryMaker;
import io.druid.sql.calcite.table.DruidTable;
import org.apache.calcite.plan.RelOptRule;
import org.apache.calcite.plan.RelOptRuleCall;
import org.apache.calcite.plan.RelOptTable;
import org.apache.calcite.rel.logical.LogicalTableScan;
public class DruidTableScanRule extends RelOptRule
{
private final PlannerContext plannerContext;
private final QueryMaker queryMaker;
public DruidTableScanRule(
final PlannerContext plannerContext,
final QueryMaker queryMaker
)
{
super(operand(LogicalTableScan.class, any()));
this.plannerContext = plannerContext;
this.queryMaker = queryMaker;
}
@Override
public void onMatch(final RelOptRuleCall call)
{
final LogicalTableScan scan = call.rel(0);
final RelOptTable table = scan.getTable();
final DruidTable druidTable = table.unwrap(DruidTable.class);
if (druidTable != null) {
call.transformTo(
DruidQueryRel.fullScan(scan.getCluster(), table, druidTable, plannerContext, queryMaker)
);
}
}
}