Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/12424#discussion_r59936989
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/commands.scala
---
@@ -528,3 +530,20 @@ case class SetDatabaseCommand(databaseName: String)
extends RunnableCommand {
override val output: Seq[Attribute] = Seq.empty
}
+
+
+/**
+ * Returns the current database of metadataHive.
+ */
+@ExpressionDescription(
+ usage = "_FUNC_() - Returns the current database.",
+ extended = "> SELECT _FUNC_()")
+private[sql] case class CurrentDatabase(ctx: SQLContext)
--- End diff --
i'm afraid this is too convoluted -- why don't we just have this function
doesn't take any arguments, and then in the optimizer (which should take a
SessionState) replace it with a literal? similar to how we compute CurrentDate.
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