spark SimpleTableProvider 源码

2022-10-20
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spark SimpleTableProvider 代码

文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/internal/connector/SimpleTableProvider.scala

/*
 * 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.spark.sql.internal.connector

import java.util

import org.apache.spark.sql.connector.catalog.{Table, TableProvider}
import org.apache.spark.sql.connector.expressions.Transform
import org.apache.spark.sql.types.StructType
import org.apache.spark.sql.util.CaseInsensitiveStringMap

// A simple version of `TableProvider` which doesn't support specified table schema/partitioning
// and treats table properties case-insensitively. This is private and only used in builtin sources.
trait SimpleTableProvider extends TableProvider {

  def getTable(options: CaseInsensitiveStringMap): Table

  private[this] var loadedTable: Table = _
  private def getOrLoadTable(options: CaseInsensitiveStringMap): Table = {
    if (loadedTable == null) loadedTable = getTable(options)
    loadedTable
  }

  override def inferSchema(options: CaseInsensitiveStringMap): StructType = {
    getOrLoadTable(options).schema()
  }

  override def getTable(
      schema: StructType,
      partitioning: Array[Transform],
      properties: util.Map[String, String]): Table = {
    assert(partitioning.isEmpty)
    getOrLoadTable(new CaseInsensitiveStringMap(properties))
  }
}

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