spark ShowTablePropertiesExec 源码
spark ShowTablePropertiesExec 代码
文件路径：/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/ShowTablePropertiesExec.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.execution.datasources.v2
import org.apache.spark.sql.catalyst.InternalRow
import org.apache.spark.sql.catalyst.expressions.Attribute
import org.apache.spark.sql.connector.catalog.{CatalogV2Util, Table}
/**
* Physical plan node for showing table properties.
*/
case class ShowTablePropertiesExec(
output: Seq[Attribute],
catalogTable: Table,
tableName: String,
propertyKey: Option[String]) extends LeafV2CommandExec {
override protected def run(): Seq[InternalRow] = {
import scala.collection.JavaConverters._
// The reserved properties are accessible through DESCRIBE
val properties = conf.redactOptions(catalogTable.properties.asScala.toMap)
.filter { case (k, _) => !CatalogV2Util.TABLE_RESERVED_PROPERTIES.contains(k) }
propertyKey match {
case Some(p) =>
val propValue = properties
.getOrElse(p, s"Table $tableName does not have property: $p")
if (output.length == 1) {
Seq(toCatalystRow(propValue))
} else {
Seq(toCatalystRow(p, propValue))
}
case None =>
properties.toSeq.sortBy(_._1).map(kv =>
toCatalystRow(kv._1, kv._2)).toSeq
}
}
}
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