Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/12872#discussion_r62136126
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/views.scala ---
@@ -71,29 +87,59 @@ case class CreateViewCommand(
require(tableDesc.schema == Nil || tableDesc.schema.length ==
analyzedPlan.output.length)
val sessionState = sparkSession.sessionState
- if (sessionState.catalog.tableExists(tableIdentifier)) {
- if (allowExisting) {
- // Handles `CREATE VIEW IF NOT EXISTS v0 AS SELECT ...`. Does
nothing when the target view
- // already exists.
- } else if (replace) {
- // Handles `CREATE OR REPLACE VIEW v0 AS SELECT ...`
- sessionState.catalog.alterTable(prepareTable(sparkSession,
analyzedPlan))
+ if (isTemporary) {
+ createTemporaryView(tableDesc.identifier, sparkSession, analyzedPlan)
+ } else {
+ // Adds default database for permanent table if it doesn't exist, so
that tableExists()
+ // only check permanent tables.
+ val database = tableDesc.identifier.database.getOrElse(
+ sessionState.catalog.getCurrentDatabase)
+ val tableIdentifier = tableDesc.identifier.copy(database =
Option(database))
+
+ if (sessionState.catalog.tableExists(tableIdentifier)) {
+ if (allowExisting) {
+ // Handles `CREATE VIEW IF NOT EXISTS v0 AS SELECT ...`. Does
nothing when the target view
+ // already exists.
+ } else if (replace) {
+ // Handles `CREATE OR REPLACE VIEW v0 AS SELECT ...`
+ sessionState.catalog.alterTable(prepareTable(sparkSession,
analyzedPlan))
+ } else {
+ // Handles `CREATE VIEW v0 AS SELECT ...`. Throws exception when
the target view already
+ // exists.
+ throw new AnalysisException(
+ s"View $tableIdentifier already exists. If you want to update
the view definition, " +
+ "please use ALTER VIEW AS or CREATE OR REPLACE VIEW AS")
+ }
} else {
- // Handles `CREATE VIEW v0 AS SELECT ...`. Throws exception when
the target view already
- // exists.
- throw new AnalysisException(s"View $tableIdentifier already
exists. " +
- "If you want to update the view definition, please use ALTER
VIEW AS or " +
- "CREATE OR REPLACE VIEW AS")
+ // Create the view if it doesn't exist.
+ sessionState.catalog.createTable(
+ prepareTable(sparkSession, analyzedPlan), ignoreIfExists = false)
}
- } else {
- // Create the view if it doesn't exist.
- sessionState.catalog.createTable(
- prepareTable(sparkSession, analyzedPlan), ignoreIfExists = false)
}
-
Seq.empty[Row]
}
+ private def createTemporaryView(
+ table: TableIdentifier, sparkSession: SparkSession, analyzedPlan:
LogicalPlan): Unit = {
+
+ val sessionState = sparkSession.sessionState
+ val catalog = sessionState.catalog
+
+ // Projects column names to alias names
+ val logicalPlan = {
+ if (tableDesc.schema.isEmpty) {
+ analyzedPlan
+ } else {
+ val projectList = analyzedPlan.output.zip(tableDesc.schema).map {
--- End diff --
we already check the lenght
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