spark KeepLegacyOutputs 源码
spark KeepLegacyOutputs 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/KeepLegacyOutputs.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.catalyst.analysis
import org.apache.spark.sql.catalyst.plans.logical.{DescribeNamespace, LogicalPlan, ShowNamespaces, ShowTableProperties, ShowTables}
import org.apache.spark.sql.catalyst.rules.Rule
import org.apache.spark.sql.catalyst.trees.TreePattern.COMMAND
import org.apache.spark.sql.internal.SQLConf
/**
* A rule for keeping the SQL command's legacy outputs.
*/
object KeepLegacyOutputs extends Rule[LogicalPlan] {
def apply(plan: LogicalPlan): LogicalPlan = {
if (!conf.getConf(SQLConf.LEGACY_KEEP_COMMAND_OUTPUT_SCHEMA)) {
plan
} else {
plan.resolveOperatorsUpWithPruning(
_.containsPattern(COMMAND)) {
case s: ShowTables =>
assert(s.output.length == 3)
val newOutput = s.output.head.withName("database") +: s.output.tail
s.copy(output = newOutput)
case s: ShowNamespaces =>
assert(s.output.length == 1)
s.copy(output = Seq(s.output.head.withName("databaseName")))
case d: DescribeNamespace =>
assert(d.output.length == 2)
d.copy(output = Seq(d.output.head.withName("database_description_item"),
d.output.last.withName("database_description_value")))
case s: ShowTableProperties if s.propertyKey.isDefined =>
s.copy(output = Seq(s.output.last))
}
}
}
}
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