spark CatalystDataToAvro 源码
spark CatalystDataToAvro 代码
文件路径：/connector/avro/src/main/scala/org/apache/spark/sql/avro/CatalystDataToAvro.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.avro
import java.io.ByteArrayOutputStream
import org.apache.avro.Schema
import org.apache.avro.generic.GenericDatumWriter
import org.apache.avro.io.{BinaryEncoder, EncoderFactory}
import org.apache.spark.sql.catalyst.expressions.{Expression, UnaryExpression}
import org.apache.spark.sql.catalyst.expressions.codegen.{CodegenContext, ExprCode}
import org.apache.spark.sql.types.{BinaryType, DataType}
private[avro] case class CatalystDataToAvro(
child: Expression,
jsonFormatSchema: Option[String]) extends UnaryExpression {
override def dataType: DataType = BinaryType
@transient private lazy val avroType =
jsonFormatSchema
.map(new Schema.Parser().setValidateDefaults(false).parse)
.getOrElse(SchemaConverters.toAvroType(child.dataType, child.nullable))
@transient private lazy val serializer =
new AvroSerializer(child.dataType, avroType, child.nullable)
@transient private lazy val writer =
new GenericDatumWriter[Any](avroType)
@transient private var encoder: BinaryEncoder = _
@transient private lazy val out = new ByteArrayOutputStream
override def nullSafeEval(input: Any): Any = {
out.reset()
encoder = EncoderFactory.get().directBinaryEncoder(out, encoder)
val avroData = serializer.serialize(input)
writer.write(avroData, encoder)
encoder.flush()
out.toByteArray
}
override def prettyName: String = "to_avro"
override protected def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
val expr = ctx.addReferenceObj("this", this)
defineCodeGen(ctx, ev, input =>
s"(byte[]) $expr.nullSafeEval($input)")
}
override protected def withNewChildInternal(newChild: Expression): CatalystDataToAvro =
copy(child = newChild)
}
相关信息
相关文章
0
赞
- 所属分类： 前端技术
- 本文标签：
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
6、 golang
-
7、 openharmony