Hyukjin Kwon created SPARK-15474: ------------------------------------ Summary: ORC data source fails to write and read back empty dataframe Key: SPARK-15474 URL: https://issues.apache.org/jira/browse/SPARK-15474 Project: Spark Issue Type: Bug Components: SQL Affects Versions: 2.0.0 Reporter: Hyukjin Kwon
Currently ORC data source fails to write and read empty data. The code below: {code} val emptyDf = spark.range(10).limit(0) emptyDf.write .format("orc") .save(path.getCanonicalPath) val copyEmptyDf = spark.read .format("orc") .load(path.getCanonicalPath) copyEmptyDf.show() {code} throws an exception below: {code} Unable to infer schema for ORC at /private/var/folders/9j/gf_c342d7d150mwrxvkqnc180000gn/T/spark-5b7aa45b-a37d-43e9-975e-a15b36b370da. It must be specified manually; org.apache.spark.sql.AnalysisException: Unable to infer schema for ORC at /private/var/folders/9j/gf_c342d7d150mwrxvkqnc180000gn/T/spark-5b7aa45b-a37d-43e9-975e-a15b36b370da. It must be specified manually; at org.apache.spark.sql.execution.datasources.DataSource$$anonfun$16.apply(DataSource.scala:352) at org.apache.spark.sql.execution.datasources.DataSource$$anonfun$16.apply(DataSource.scala:352) at scala.Option.getOrElse(Option.scala:121) at org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:351) at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:130) at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:140) at org.apache.spark.sql.sources.HadoopFsRelationTest$$anonfun$32$$anonfun$apply$mcV$sp$47.apply(HadoopFsRelationTest.scala:892) at org.apache.spark.sql.sources.HadoopFsRelationTest$$anonfun$32$$anonfun$apply$mcV$sp$47.apply(HadoopFsRelationTest.scala:884) at org.apache.spark.sql.test.SQLTestUtils$class.withTempPath(SQLTestUtils.scala:114) {code} Note that this is a different case with the data below {code} val emptyDf = spark.createDataFrame(spark.sparkContext.emptyRDD[Row], schema) {code} In this case, any writer is not initialised and created. (no calls of {{WriterContainer.writeRows()}}. For Parquet and JSON, it works but ORC does not. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org