Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/16386#discussion_r93732800
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/json/JsonDataSource.scala
---
@@ -0,0 +1,204 @@
+/*
+ * 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.execution.datasources.json
+
+import java.io.InputStream
+
+import scala.reflect.ClassTag
+
+import com.fasterxml.jackson.core.{JsonFactory, JsonParser}
+import org.apache.hadoop.conf.Configuration
+import org.apache.hadoop.fs.{FileStatus, Path}
+import org.apache.hadoop.io.{LongWritable, Text}
+import org.apache.hadoop.mapreduce.Job
+import org.apache.hadoop.mapreduce.lib.input.{FileInputFormat,
TextInputFormat}
+
+import org.apache.spark.TaskContext
+import org.apache.spark.input.{PortableDataStream, StreamInputFormat}
+import org.apache.spark.rdd.{BinaryFileRDD, RDD}
+import org.apache.spark.sql.{AnalysisException, SparkSession}
+import org.apache.spark.sql.catalyst.InternalRow
+import org.apache.spark.sql.catalyst.json.{CreateJacksonParser,
JacksonParser, JSONOptions}
+import org.apache.spark.sql.execution.datasources.{CodecStreams,
HadoopFileLinesReader, PartitionedFile}
+import org.apache.spark.sql.types.StructType
+
+/**
+ * Common functions for parsing JSON files
+ * @tparam T A datatype containing the unparsed JSON, such as [[Text]] or
[[String]]
+ */
+abstract class JsonDataSource[T] extends Serializable {
+ def isSplitable: Boolean
+
+ /**
+ * Parse a [[PartitionedFile]] into 0 or more [[InternalRow]] instances
+ */
+ def readFile(
+ conf: Configuration,
+ file: PartitionedFile,
+ parser: JacksonParser): Iterator[InternalRow]
+
+ /**
+ * Create an [[RDD]] that handles the preliminary parsing of [[T]]
records
+ */
+ protected def createBaseRdd(
+ sparkSession: SparkSession,
+ inputPaths: Seq[FileStatus]): RDD[T]
+
+ /**
+ * A generic wrapper to invoke the correct [[JsonFactory]] method to
allocate a [[JsonParser]]
+ * for an instance of [[T]]
+ */
+ def createParser(jsonFactory: JsonFactory, value: T): JsonParser
+
+ final def infer(
+ sparkSession: SparkSession,
+ inputPaths: Seq[FileStatus],
+ parsedOptions: JSONOptions): Option[StructType] = {
+ val jsonSchema = InferSchema.infer(
+ createBaseRdd(sparkSession, inputPaths),
+ parsedOptions,
+ createParser)
+ checkConstraints(jsonSchema)
+
+ if (jsonSchema.fields.nonEmpty) {
--- End diff --
It seems this changes existing behaviour (not allowing empty schema).
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