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/*
* 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.rules
import org.apache.spark.util.Utils
/**
* A collection of generators that build custom bytecode at runtime for performing the evaluation
* of catalyst expression.
*/
package object codegen {
/** Canonicalizes an expression so those that differ only by names can reuse the same code. */
object ExpressionCanonicalizer extends rules.RuleExecutor[Expression] {
val batches =
Batch("CleanExpressions", FixedPoint(20), CleanExpressions) :: Nil
object CleanExpressions extends rules.Rule[Expression] {
def apply(e: Expression): Expression = e transform {
case Alias(c, _) => c
}
}
}
// Commented out because the nsc import doesn't work with 2.12
/**
* Dumps the bytecode from a class to the screen using javap.
*/
/*
object DumpByteCode {
import scala.sys.process._
val dumpDirectory = Utils.createTempDir()
dumpDirectory.mkdir()
def apply(obj: Any): Unit = {
val generatedClass = obj.getClass
val classLoader =
generatedClass
.getClassLoader
.asInstanceOf[scala.tools.nsc.interpreter.AbstractFileClassLoader]
val generatedBytes = classLoader.classBytes(generatedClass.getName)
val packageDir = new java.io.File(dumpDirectory, generatedClass.getPackage.getName)
if (!packageDir.exists()) { packageDir.mkdir() }
val classFile =
new java.io.File(packageDir, generatedClass.getName.split("\\.").last + ".class")
val outfile = new java.io.FileOutputStream(classFile)
outfile.write(generatedBytes)
outfile.close()
// scalastyle:off println
println(
s"javap -p -v -classpath ${dumpDirectory.getCanonicalPath} ${generatedClass.getName}".!!)
// scalastyle:on println
}
}
*/
}
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