Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/11194#discussion_r52841904 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/csv/CSVSuite.scala --- @@ -387,4 +387,16 @@ class CSVSuite extends QueryTest with SharedSQLContext with SQLTestUtils { verifyCars(carsCopy, withHeader = true) } } + + test("Schema inference correctly identifies the datatype when data is sparse.") { + val df = sqlContext.read + .format("csv") + .option("header", "true") + .option("inferSchema", "true") + .load(testFile(simpleSparseFile)) + + assert( + df.schema.fields.map{field => field.dataType}.deep == --- End diff -- A little nit (maybe only for me) but how about using `()` instead of `{}`? I see the `{}` has been used with some indentations and new lines in Spark codes.
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