Github user NathanHowell commented on a diff in the pull request:

    https://github.com/apache/spark/pull/16386#discussion_r100098008
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/json/JsonSuite.scala
 ---
    @@ -1764,4 +1769,125 @@ class JsonSuite extends QueryTest with 
SharedSQLContext with TestJsonData {
         val df2 = spark.read.option("PREfersdecimaL", "true").json(records)
         assert(df2.schema == schema)
       }
    +
    +  test("SPARK-18352: Parse normal multi-line JSON files (compressed)") {
    +    withTempDir { dir =>
    +      dir.delete()
    +      val path = dir.getCanonicalPath
    +      primitiveFieldAndType
    +        .toDF("value")
    +        .write
    +        .option("compression", "GzIp")
    +        .text(path)
    +
    +      new File(path).listFiles() match {
    +        case compressedFiles =>
    +          assert(compressedFiles.exists(_.getName.endsWith(".gz")))
    +      }
    +
    +      val jsonDF = spark.read.option("wholeFile", true).json(path)
    +      val jsonDir = new File(dir, "json").getCanonicalPath
    +      jsonDF.coalesce(1).write
    +        .format("json")
    +        .option("compression", "gZiP")
    +        .save(jsonDir)
    +
    +      new File(jsonDir).listFiles() match {
    +        case compressedFiles =>
    +          assert(compressedFiles.exists(_.getName.endsWith(".json.gz")))
    +      }
    +
    +      val jsonCopy = spark.read
    +        .format("json")
    +        .load(jsonDir)
    +
    +      assert(jsonCopy.count === jsonDF.count)
    +      val jsonCopySome = jsonCopy.selectExpr("string", "long", "boolean")
    +      val jsonDFSome = jsonDF.selectExpr("string", "long", "boolean")
    +      checkAnswer(jsonCopySome, jsonDFSome)
    +    }
    +  }
    +
    +  test("SPARK-18352: Parse normal multi-line JSON files (uncompressed)") {
    +    withTempDir { dir =>
    +      dir.delete()
    +      val path = dir.getCanonicalPath
    +      primitiveFieldAndType
    +        .toDF("value")
    +        .write
    +        .text(path)
    +
    +      val jsonDF = spark.read.option("wholeFile", true).json(path)
    +      val jsonDir = new File(dir, "json").getCanonicalPath
    +      jsonDF.coalesce(1).write
    +        .format("json")
    +        .save(jsonDir)
    +
    +      val compressedFiles = new File(jsonDir).listFiles()
    +      assert(compressedFiles.exists(_.getName.endsWith(".json")))
    +
    +      val jsonCopy = spark.read
    +        .format("json")
    +        .load(jsonDir)
    +
    +      assert(jsonCopy.count === jsonDF.count)
    +      val jsonCopySome = jsonCopy.selectExpr("string", "long", "boolean")
    +      val jsonDFSome = jsonDF.selectExpr("string", "long", "boolean")
    +      checkAnswer(jsonCopySome, jsonDFSome)
    +    }
    +  }
    +
    +  test("SPARK-18352: Expect one JSON document per file") {
    +    // the json parser terminates as soon as it sees a matching END_OBJECT 
or END_ARRAY token.
    +    // this might not be the optimal behavior but this test verifies that 
only the first value
    +    // is parsed and the rest are discarded.
    +
    +    // alternatively the parser could continue parsing following objects, 
which may further reduce
    +    // allocations by skipping the line reader entirely
    +
    +    withTempDir { dir =>
    +      dir.delete()
    +      val path = dir.getCanonicalPath
    +      primitiveFieldAndType
    +        .flatMap(Iterator.fill(3)(_) ++ Iterator("\n{invalid}"))
    --- End diff --
    
    sure


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