Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/12036#discussion_r57770133
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala ---
@@ -86,13 +87,50 @@ case class DescribeDatabase(
extended: Boolean)(sql: String)
extends NativeDDLCommand(sql) with Logging
+/**
+ * The DDL command that creates a function.
+ * alias: the class name that implements the created function.
+ * resources: Jars, files, or archives which need to be added to the
environment when the function
+ * is referenced for the first time by a session.
+ * isTemp: indicates if it is a temporary function.
+ */
case class CreateFunction(
databaseName: Option[String],
functionName: String,
alias: String,
resources: Seq[(String, String)],
isTemp: Boolean)(sql: String)
- extends NativeDDLCommand(sql) with Logging
+ extends NativeDDLCommand(sql) with Logging {
+
+ override def run(sqlContext: SQLContext): Seq[Row] = {
+ val func = FunctionIdentifier(functionName, databaseName)
+ val catalogFunc = CatalogFunction(func, alias)
+ if (isTemp) {
+ // Set `ignoreIfExists` to false, so if the temporary function
already exists,
+ // an exception will be thrown.
+ val (info, builder) =
+
sqlContext.sessionState.functionRegistry.getFunctionBuilderAndInfo(functionName,
alias)
+ sqlContext.sessionState.catalog.createTempFunction(functionName,
info, builder, false)
+ } else {
+ // Check if the function to create is already existing. If so, throw
exception.
+ var funcExisting: Boolean = true
+ try {
+ if (sqlContext.sessionState.catalog.getFunction(func) == null) {
+ funcExisting = false
+ }
+ } catch {
+ case _: NoSuchFunctionException => funcExisting = false
+ }
--- End diff --
this is pretty round about way to write it. You can simplify this:
```
val funcExists =
try {
sqlContext.sessionState.catalog.getFunction(func) != null
} catch {
case _: NoSuchFunctionException => false
}
```
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