spark EvalMode 源码
spark EvalMode 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/EvalMode.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.expressions
import org.apache.spark.sql.internal.SQLConf
/**
* Expression evaluation modes.
* - LEGACY: the default evaluation mode, which is compliant to Hive SQL.
* - ANSI: a evaluation mode which is compliant to ANSI SQL standard.
* - TRY: a evaluation mode for `try_*` functions. It is identical to ANSI evaluation mode
* except for returning null result on errors.
*/
object EvalMode extends Enumeration {
val LEGACY, ANSI, TRY = Value
def fromSQLConf(conf: SQLConf): Value = if (conf.ansiEnabled) {
ANSI
} else {
LEGACY
}
def fromBoolean(ansiEnabled: Boolean): Value = if (ansiEnabled) {
ANSI
} else {
LEGACY
}
}
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