Github user ericl commented on a diff in the pull request:
https://github.com/apache/spark/pull/16090#discussion_r90590350
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/createDataSourceTables.scala
---
@@ -58,13 +58,21 @@ case class CreateDataSourceTableCommand(table:
CatalogTable, ignoreIfExists: Boo
// Create the relation to validate the arguments before writing the
metadata to the metastore,
// and infer the table schema and partition if users didn't specify
schema in CREATE TABLE.
val pathOption = table.storage.locationUri.map("path" -> _)
+ // Fill in some default table options from the session conf
+ val uncreatedTable = table.copy(
+ identifier = table.identifier.copy(
+ database = Some(
+
table.identifier.database.getOrElse(sessionState.catalog.getCurrentDatabase))),
+ tracksPartitionsInCatalog =
sparkSession.sessionState.conf.manageFilesourcePartitions)
val dataSource: BaseRelation =
DataSource(
sparkSession = sparkSession,
userSpecifiedSchema = if (table.schema.isEmpty) None else
Some(table.schema),
+ partitionColumns = table.partitionColumnNames,
--- End diff --
You don't want to do that though. Resolve relation also does not always
scan the filesystem if you pass in a user defined schema.
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