Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18142#discussion_r119014081
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
---
@@ -17,51 +17,74 @@
package org.apache.spark.sql.catalyst.analysis
-import java.lang.reflect.Modifier
+import java.util.Locale
+import javax.annotation.concurrent.GuardedBy
+import scala.collection.mutable
import scala.language.existentials
import scala.reflect.ClassTag
import scala.util.{Failure, Success, Try}
import org.apache.spark.sql.AnalysisException
+import org.apache.spark.sql.catalyst.FunctionIdentifier
import
org.apache.spark.sql.catalyst.analysis.FunctionRegistry.FunctionBuilder
import org.apache.spark.sql.catalyst.expressions._
import org.apache.spark.sql.catalyst.expressions.aggregate._
import org.apache.spark.sql.catalyst.expressions.xml._
-import org.apache.spark.sql.catalyst.util.StringKeyHashMap
import org.apache.spark.sql.types._
/**
* A catalog for looking up user defined functions, used by an
[[Analyzer]].
*
- * Note: The implementation should be thread-safe to allow concurrent
access.
+ * Note:
+ * 1) The implementation should be thread-safe to allow concurrent
access.
+ * 2) the database name is always case-sensitive here, callers are
responsible to
+ * format the database name w.r.t. case-sensitive config.
*/
trait FunctionRegistry {
- final def registerFunction(name: String, builder: FunctionBuilder): Unit
= {
- registerFunction(name, new
ExpressionInfo(builder.getClass.getCanonicalName, name), builder)
+ final def registerFunction(name: FunctionIdentifier, builder:
FunctionBuilder): Unit = {
+ val info = new ExpressionInfo(
+ builder.getClass.getCanonicalName, name.database.orNull,
name.funcName)
+ registerFunction(name, info, builder)
}
- def registerFunction(name: String, info: ExpressionInfo, builder:
FunctionBuilder): Unit
+ def registerFunction(
+ name: FunctionIdentifier,
+ info: ExpressionInfo,
+ builder: FunctionBuilder): Unit
+
+ /* Create or replace a temporary function. */
+ final def createOrReplaceTempFunction(name: String, builder:
FunctionBuilder): Unit = {
--- End diff --
Since we already expose `FunctionRegistry` to the stable class
`UDFRegistration`, I added this extra API for a helper function.
Ideally, this function should only exist in `SessionCatalog`.
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