Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21774#discussion_r203938730
--- Diff:
external/avro/src/main/scala/org/apache/spark/sql/avro/AvroDataToCatalyst.scala
---
@@ -0,0 +1,64 @@
+/*
+ * 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
+
+import org.apache.avro.generic.GenericDatumReader
+import org.apache.avro.io.{BinaryDecoder, DecoderFactory}
+
+import org.apache.spark.sql.avro.{AvroDeserializer, SchemaConverters,
SerializableSchema}
+import org.apache.spark.sql.catalyst.expressions.{ExpectsInputTypes,
Expression, UnaryExpression}
+import org.apache.spark.sql.catalyst.expressions.codegen.{CodegenContext,
CodeGenerator, ExprCode}
+import org.apache.spark.sql.types.{AbstractDataType, BinaryType, DataType}
+
+case class AvroDataToCatalyst(child: Expression, avroType:
SerializableSchema)
+ extends UnaryExpression with ExpectsInputTypes {
+
+ override def inputTypes: Seq[AbstractDataType] = Seq(BinaryType)
+
+ override lazy val dataType: DataType =
+ SchemaConverters.toSqlType(avroType.value).dataType
+
+ override def nullable: Boolean = true
+
+ @transient private lazy val reader = new
GenericDatumReader[Any](avroType.value)
+
+ @transient private lazy val deserializer = new
AvroDeserializer(avroType.value, dataType)
+
+ @transient private var decoder: BinaryDecoder = _
+
+ @transient private var result: Any = _
+
+ override def nullSafeEval(input: Any): Any = {
+ val binary = input.asInstanceOf[Array[Byte]]
+ decoder = DecoderFactory.get().binaryDecoder(binary, 0, binary.length,
decoder)
+ result = reader.read(result, decoder)
+ deserializer.deserialize(result)
+ }
+
+ override def simpleString: String = {
+ s"from_avro(${child.sql}, ${dataType.simpleString})"
--- End diff --
IIRC `simpleString` will be used in the plan string and should not be too
long.
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