diff --git a/sql/hive/src/main/scala/org/apache/spark/sql/hive/TableReader.scala b/sql/hive/src/main/scala/org/apache/spark/sql/hive/TableReader.scala index f60bc3788e3e42105accc782f660a0b72f62ed6d..c368715f7c6f58117b2edd278bed7dce044afae6 100644 --- a/sql/hive/src/main/scala/org/apache/spark/sql/hive/TableReader.scala +++ b/sql/hive/src/main/scala/org/apache/spark/sql/hive/TableReader.scala @@ -57,10 +57,15 @@ class HadoopTableReader( @transient hiveExtraConf: HiveConf) extends TableReader { - // Choose the minimum number of splits. If mapred.map.tasks is set, then use that unless - // it is smaller than what Spark suggests. - private val _minSplitsPerRDD = math.max( - sc.hiveconf.getInt("mapred.map.tasks", 1), sc.sparkContext.defaultMinPartitions) + // Hadoop honors "mapred.map.tasks" as hint, but will ignore when mapred.job.tracker is "local". + // https://hadoop.apache.org/docs/r1.0.4/mapred-default.html + // + // In order keep consistency with Hive, we will let it be 0 in local mode also. + private val _minSplitsPerRDD = if (sc.sparkContext.isLocal) { + 0 // will splitted based on block by default. + } else { + math.max(sc.hiveconf.getInt("mapred.map.tasks", 1), sc.sparkContext.defaultMinPartitions) + } // TODO: set aws s3 credentials. diff --git a/sql/hive/src/test/resources/golden/file_split_for_small_table-0-7a45831bf96814d9a7fc3d78fb7bd8dc b/sql/hive/src/test/resources/golden/file_split_for_small_table-0-7a45831bf96814d9a7fc3d78fb7bd8dc new file mode 100644 index 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+44,14 @@ class HiveTableScanSuite extends HiveComparisonTest { |SELECT * from part_scan_test; """.stripMargin) + // In unit test, kv1.txt is a small file and will be loaded as table src + // Since the small file will be considered as a single split, we assume + // Hive / SparkSQL HQL has the same output even for SORT BY + createQueryTest("file_split_for_small_table", + """ + |SELECT key, value FROM src SORT BY key, value + """.stripMargin) + test("Spark-4041: lowercase issue") { TestHive.sql("CREATE TABLE tb (KEY INT, VALUE STRING) STORED AS ORC") TestHive.sql("insert into table tb select key, value from src") @@ -68,5 +76,4 @@ class HiveTableScanSuite extends HiveComparisonTest { === Array(Row(java.sql.Timestamp.valueOf("2014-12-11 00:00:00")),Row(null))) TestHive.sql("DROP TABLE timestamp_query_null") } - }