ConeyLiu commented on a change in pull request #23086: [SPARK-25528][SQL] data
source v2 API refactor (batch read)
URL: https://github.com/apache/spark/pull/23086#discussion_r267719800
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File path: sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala
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@@ -194,20 +194,26 @@ class DataFrameReader private[sql](sparkSession:
SparkSession) extends Logging {
}
val cls = DataSource.lookupDataSource(source,
sparkSession.sessionState.conf)
- if (classOf[DataSourceV2].isAssignableFrom(cls)) {
- val ds = cls.getConstructor().newInstance().asInstanceOf[DataSourceV2]
- if (ds.isInstanceOf[BatchReadSupportProvider]) {
- val sessionOptions = DataSourceV2Utils.extractSessionConfigs(
- ds = ds, conf = sparkSession.sessionState.conf)
- val pathsOption = {
- val objectMapper = new ObjectMapper()
- DataSourceOptions.PATHS_KEY ->
objectMapper.writeValueAsString(paths.toArray)
- }
- Dataset.ofRows(sparkSession, DataSourceV2Relation.create(
- ds, sessionOptions ++ extraOptions.toMap + pathsOption,
- userSpecifiedSchema = userSpecifiedSchema))
- } else {
- loadV1Source(paths: _*)
+ if (classOf[TableProvider].isAssignableFrom(cls)) {
+ val provider =
cls.getConstructor().newInstance().asInstanceOf[TableProvider]
+ val sessionOptions = DataSourceV2Utils.extractSessionConfigs(
+ ds = provider, conf = sparkSession.sessionState.conf)
+ val pathsOption = {
+ val objectMapper = new ObjectMapper()
+ DataSourceOptions.PATHS_KEY ->
objectMapper.writeValueAsString(paths.toArray)
+ }
+ val finalOptions = sessionOptions ++ extraOptions.toMap + pathsOption
+ val dsOptions = new DataSourceOptions(finalOptions.asJava)
+ val table = userSpecifiedSchema match {
+ case Some(schema) => provider.getTable(dsOptions, schema)
+ case _ => provider.getTable(dsOptions)
+ }
+ table match {
+ case s: SupportsBatchRead =>
+ Dataset.ofRows(sparkSession, DataSourceV2Relation.create(
+ provider, s, finalOptions, userSpecifiedSchema =
userSpecifiedSchema))
+
+ case _ => loadV1Source(paths: _*)
Review comment:
Hi @cloud-fan. I have a minor question here how we load the data that just
extend the `SupportsRead`.
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