flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/physical/PhysicalTableSourceScan.scala

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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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 *     http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.flink.table.plan.nodes.physical

import org.apache.flink.table.calcite.FlinkTypeFactory
import org.apache.flink.table.plan.schema.{FlinkRelOptTable, TableSourceTable}
import org.apache.flink.table.sources.TableSource

import org.apache.calcite.plan.{RelOptCluster, RelTraitSet}
import org.apache.calcite.rel.RelWriter
import org.apache.calcite.rel.`type`.RelDataType
import org.apache.calcite.rel.core.TableScan

import scala.collection.JavaConverters._

abstract class PhysicalTableSourceScan(
    cluster: RelOptCluster,
    traitSet: RelTraitSet,
    relOptTable: FlinkRelOptTable)
  extends TableScan(cluster, traitSet, relOptTable) {

  protected val tableSourceTable: TableSourceTable =
    relOptTable.unwrap(classOf[TableSourceTable])

  protected[flink] val tableSource: TableSource = tableSourceTable.tableSource

  override def deriveRowType(): RelDataType = {
    val flinkTypeFactory = cluster.getTypeFactory.asInstanceOf[FlinkTypeFactory]
    tableSourceTable.getRowType(flinkTypeFactory)
  }

  override def explainTerms(pw: RelWriter): RelWriter = {
    super.explainTerms(pw).item("fields", getRowType.getFieldNames.asScala.mkString(", "))
  }

  def copy(traitSet: RelTraitSet, relOptTable: FlinkRelOptTable): PhysicalTableSourceScan

}