Github user twalthr commented on a diff in the pull request: https://github.com/apache/flink/pull/2653#discussion_r88493178 --- 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 --- End diff -- As I said earlier this and following lines are very error-prone. We should keep calls to the TypeExtractor to a very minimum. The TypeExtractor is only intended for Java not Scala.
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