spark constraintExpressions 源码
spark constraintExpressions 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/constraintExpressions.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.catalyst.InternalRow
import org.apache.spark.sql.catalyst.expressions.codegen.{CodegenContext, ExprCode, FalseLiteral}
import org.apache.spark.sql.types.DataType
trait TaggingExpression extends UnaryExpression {
override def nullable: Boolean = child.nullable
override def dataType: DataType = child.dataType
override protected def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = child.genCode(ctx)
override def eval(input: InternalRow): Any = child.eval(input)
}
case class KnownNullable(child: Expression) extends TaggingExpression {
override def nullable: Boolean = true
override protected def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
child.genCode(ctx)
}
override protected def withNewChildInternal(newChild: Expression): KnownNullable =
copy(child = newChild)
}
case class KnownNotNull(child: Expression) extends TaggingExpression {
override def nullable: Boolean = false
override protected def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
child.genCode(ctx).copy(isNull = FalseLiteral)
}
override protected def withNewChildInternal(newChild: Expression): KnownNotNull =
copy(child = newChild)
}
case class KnownFloatingPointNormalized(child: Expression) extends TaggingExpression {
override protected def withNewChildInternal(newChild: Expression): KnownFloatingPointNormalized =
copy(child = newChild)
}
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