org.apache.flink.table.planner.plan.rules.physical.stream.StreamExecTableSourceScanRule.scala Maven / Gradle / Ivy
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This module bridges Table/SQL API and runtime. It contains
all resources that are required during pre-flight and runtime
phase. The content of this module is work-in-progress. It will
replace flink-table-planner once it is stable. See FLINK-11439
and FLIP-32 for more details.
/*
* 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.planner.plan.rules.physical.stream
import org.apache.flink.table.planner.plan.nodes.FlinkConventions
import org.apache.flink.table.planner.plan.nodes.logical.FlinkLogicalTableSourceScan
import org.apache.flink.table.planner.plan.nodes.physical.stream.StreamExecTableSourceScan
import org.apache.flink.table.planner.plan.schema.{FlinkRelOptTable, TableSourceTable}
import org.apache.flink.table.sources.StreamTableSource
import org.apache.calcite.plan.{RelOptRule, RelOptRuleCall, RelTraitSet}
import org.apache.calcite.rel.RelNode
import org.apache.calcite.rel.convert.ConverterRule
import org.apache.calcite.rel.core.TableScan
/**
* Rule that converts [[FlinkLogicalTableSourceScan]] to [[StreamExecTableSourceScan]].
*/
class StreamExecTableSourceScanRule
extends ConverterRule(
classOf[FlinkLogicalTableSourceScan],
FlinkConventions.LOGICAL,
FlinkConventions.STREAM_PHYSICAL,
"StreamExecTableSourceScanRule") {
/** Rule must only match if TableScan targets a [[StreamTableSource]] */
override def matches(call: RelOptRuleCall): Boolean = {
val scan: TableScan = call.rel(0).asInstanceOf[TableScan]
val tableSourceTable = scan.getTable.unwrap(classOf[TableSourceTable[_]])
tableSourceTable match {
case tst: TableSourceTable[_] =>
tst.tableSource match {
case _: StreamTableSource[_] => true
case _ => false
}
case _ => false
}
}
def convert(rel: RelNode): RelNode = {
val scan: FlinkLogicalTableSourceScan = rel.asInstanceOf[FlinkLogicalTableSourceScan]
val traitSet: RelTraitSet = rel.getTraitSet.replace(FlinkConventions.STREAM_PHYSICAL)
new StreamExecTableSourceScan(
rel.getCluster,
traitSet,
scan.getTable.asInstanceOf[FlinkRelOptTable]
)
}
}
object StreamExecTableSourceScanRule {
val INSTANCE: RelOptRule = new StreamExecTableSourceScanRule
}