dongjoon-hyun commented on a change in pull request #24043: [SPARK-11412][SQL]
Support merge schema for ORC
URL: https://github.com/apache/spark/pull/24043#discussion_r281843997
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/orc/OrcUtils.scala
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@@ -81,14 +82,97 @@ object OrcUtils extends Logging {
: Option[StructType] = {
val ignoreCorruptFiles = sparkSession.sessionState.conf.ignoreCorruptFiles
val conf = sparkSession.sessionState.newHadoopConf()
- // TODO: We need to support merge schema. Please see SPARK-11412.
files.toIterator.map(file => readSchema(file.getPath, conf,
ignoreCorruptFiles)).collectFirst {
case Some(schema) =>
logDebug(s"Reading schema from file $files, got Hive schema string:
$schema")
CatalystSqlParser.parseDataType(schema.toString).asInstanceOf[StructType]
}
}
+ /**
+ * Read single ORC file schema using native version of ORC
+ */
+ def singleFileSchemaReader(file: String, conf: Configuration,
ignoreCorruptFiles: Boolean)
+ : Option[StructType] = {
+ OrcUtils.readSchema(new Path(file), conf, ignoreCorruptFiles)
+ .map(s =>
CatalystSqlParser.parseDataType(s.toString).asInstanceOf[StructType])
+ }
+
+ /**
+ * Figures out a merged ORC schema with a distributed Spark job.
+ * This function is used by both
`org.apache.spark.sql.hive.orc.OrcFileFormat`
+ * and `org.apache.spark.sql.execution.datasources.orc.OrcFileFormat`.
Review comment:
What happens for `OrcDataSourceV2`?
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