spark ResolveCommandsWithIfExists 源码
spark ResolveCommandsWithIfExists 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/ResolveCommandsWithIfExists.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.{DropFunction, LogicalPlan, NoopCommand, UncacheTable}
import org.apache.spark.sql.catalyst.rules.Rule
import org.apache.spark.sql.catalyst.trees.TreePattern.COMMAND
/**
* A rule for handling commands when the table or temp view is not resolved.
* These commands support a flag, "ifExists", so that they do not fail when a relation is not
* resolved. If the "ifExists" flag is set to true. the plan is resolved to [[NoopCommand]],
*/
object ResolveCommandsWithIfExists extends Rule[LogicalPlan] {
def apply(plan: LogicalPlan): LogicalPlan = plan.resolveOperatorsUpWithPruning(
_.containsPattern(COMMAND)) {
case UncacheTable(u: UnresolvedRelation, ifExists, _) if ifExists =>
NoopCommand("UNCACHE TABLE", u.multipartIdentifier)
case DropFunction(u: UnresolvedFunc, ifExists) if ifExists =>
NoopCommand("DROP FUNCTION", u.multipartIdentifier)
}
}
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