Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/10733#discussion_r50932944
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/CreateViewAsSelect.scala
---
@@ -44,55 +48,96 @@ private[hive] case class CreateViewAsSelect(
override def run(sqlContext: SQLContext): Seq[Row] = {
val hiveContext = sqlContext.asInstanceOf[HiveContext]
- if (hiveContext.catalog.tableExists(tableIdentifier)) {
- if (allowExisting) {
- // view already exists, will do nothing, to keep consistent with
Hive
- } else if (orReplace) {
- hiveContext.catalog.client.alertView(prepareTable())
- } else {
+ hiveContext.catalog.tableExists(tableIdentifier) match {
+ case true if allowExisting =>
+ // Handles `CREATE VIEW IF NOT EXISTS v0 AS SELECT ...`. Does
nothing when the target view
+ // already exists.
+
+ case true if orReplace =>
+ // Handles `CREATE OR REPLACE VIEW v0 AS SELECT ...`
+ hiveContext.catalog.client.alertView(prepareTable(sqlContext))
+
+ case true =>
+ // 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 {
- hiveContext.catalog.client.createView(prepareTable())
+
+ case false =>
+ hiveContext.catalog.client.createView(prepareTable(sqlContext))
}
Seq.empty[Row]
}
- private def prepareTable(): HiveTable = {
- // setup column types according to the schema of child.
- val schema = if (tableDesc.schema == Nil) {
- childSchema.map { attr =>
- HiveColumn(attr.name,
HiveMetastoreTypes.toMetastoreType(attr.dataType), null)
- }
+ private def prepareTable(sqlContext: SQLContext): HiveTable = {
+ val expandedText = if (sqlContext.conf.canonicalView) {
+ rebuildViewQueryString(sqlContext).getOrElse(wrapViewTextWithSelect)
} else {
- childSchema.zip(tableDesc.schema).map { case (attr, col) =>
- HiveColumn(col.name,
HiveMetastoreTypes.toMetastoreType(attr.dataType), col.comment)
+ wrapViewTextWithSelect
+ }
+
+ val viewSchema = {
+ if (tableDesc.schema.isEmpty) {
+ childSchema.map { attr =>
+ HiveColumn(attr.name,
HiveMetastoreTypes.toMetastoreType(attr.dataType), null)
+ }
+ } else {
+ childSchema.zip(tableDesc.schema).map { case (attr, col) =>
--- End diff --
I just realized that we do the check at
https://github.com/apache/spark/pull/10733/files#diff-074b1d8480e0d0d7c212bc4461f3d4acR43
(`assert(tableDesc.schema == Nil || tableDesc.schema.length ==
childSchema.length)`)
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