Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/2653#discussion_r88346802
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/validate/FunctionCatalog.scala
---
@@ -47,13 +52,50 @@ class FunctionCatalog {
sqlFunctions += sqlFunction
}
+ /** Register multiple sql functions at one time. The functions has the
same name. **/
+ def registerSqlFunctions(functions: Seq[SqlFunction]): Unit = {
+ if (functions.nonEmpty) {
+ sqlFunctions --= sqlFunctions.filter(_.getName ==
functions.head.getName)
+ sqlFunctions ++= functions
+ }
+ }
+
def getSqlOperatorTable: SqlOperatorTable =
ChainedSqlOperatorTable.of(
new BasicOperatorTable(),
new ListSqlOperatorTable(sqlFunctions)
)
/**
+ * Lookup table function and create an TableFunctionCall if we find a
match.
+ */
+ def lookupTableFunction[T](name: String, children: Seq[Expression]):
TableFunctionCall[T] = {
+ val funcClass = functionBuilders
+ .getOrElse(name.toLowerCase, throw ValidationException(s"Undefined
function: $name"))
+ funcClass match {
+ // user-defined table function call
+ case tf if classOf[TableFunction[T]].isAssignableFrom(tf) =>
+
Try(UserDefinedFunctionUtils.instantiate(tf.asInstanceOf[Class[TableFunction[T]]]))
match {
+ case Success(tableFunction) => {
+ val clazz: Type = tableFunction.getClass.getGenericSuperclass
+ val generic = clazz match {
+ case cls: ParameterizedType =>
cls.getActualTypeArguments.toSeq.head
+ case _ => throw new TableException(
+ "New TableFunction classes need to inherit from
TableFunction class," +
+ " and statement the generic type.")
+ }
+ implicit val typeInfo: TypeInformation[T] =
TypeExtractor.createTypeInfo(generic)
+ .asInstanceOf[TypeInformation[T]]
+ TableFunctionCall(tableFunction, children, None)
+ }
+ case Failure(e) => throw ValidationException(e.getMessage)
+ }
+ case _ =>
+ throw ValidationException("Unsupported table function.")
--- End diff --
I think this exception message could be improved. It is throw if the
registered method does not implement the `TableFunction` interface.
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