org.apache.flink.table.calcite.FlinkRelOptCluster.scala Maven / Gradle / Ivy
/*
* 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
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.flink.table.calcite
import org.apache.flink.table.plan.metadata.FlinkRelMetadataQuery
import org.apache.calcite.plan.{RelOptCluster, RelOptPlanner, RelOptRule, RelOptRuleCall}
import org.apache.calcite.rel.RelNode
import org.apache.calcite.rel.`type`.RelDataTypeFactory
import org.apache.calcite.rel.metadata.RelMetadataQuery
import org.apache.calcite.rex.RexBuilder
import java.util
import java.util.concurrent.atomic.AtomicInteger
/**
* Flink specific [[RelOptCluster]] to use [[FlinkRelMetadataQuery]] instead of
* [[RelMetadataQuery]].
*/
class FlinkRelOptCluster(
planner: RelOptPlanner,
typeFactory: RelDataTypeFactory,
rexBuilder: RexBuilder,
nextCorrel: AtomicInteger,
mapCorrelToRel: util.Map[String, RelNode])
extends RelOptCluster(planner, typeFactory, rexBuilder, nextCorrel, mapCorrelToRel) {
private var fmq: FlinkRelMetadataQuery = _
/**
* Returns the current [[FlinkRelMetadataQuery]] instead of [[RelMetadataQuery]].
*
* This method might be changed or moved in future.
* If you have a [[RelOptRuleCall]] available,
* for example if you are in a [[RelOptRule#onMatch(RelOptRuleCall)]]
* method, then use [[RelOptRuleCall#getMetadataQuery()]] instead.
*/
override def getMetadataQuery: RelMetadataQuery = {
if (fmq == null) fmq = FlinkRelMetadataQuery.instance()
fmq
}
/**
* Should be called whenever the current [[FlinkRelMetadataQuery]] becomes
* invalid. Typically invoked from [[RelOptRuleCall#transformTo]].
*/
override def invalidateMetadataQuery(): Unit = fmq = null
}
object FlinkRelOptCluster {
/** Creates a FlinkRelOptCluster instance. */
def create(planner: RelOptPlanner, rexBuilder: RexBuilder): RelOptCluster =
new FlinkRelOptCluster(
planner,
rexBuilder.getTypeFactory,
rexBuilder,
new AtomicInteger(0),
new util.HashMap[String, RelNode])
}