Github user vasia commented on a diff in the pull request: https://github.com/apache/flink/pull/1827#discussion_r57075247 --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/api/java/table/TableEnvironment.scala --- @@ -87,5 +90,72 @@ class TableEnvironment { new JavaBatchTranslator(config).translate[T](table.relNode)(typeInfo) } -} + /** + * Registers a DataSet under a unique name, so that it can be used in SQL queries. + * The fields of the DataSet type are used to name the Table fields. + * @param name the Table name + * @param dataset the DataSet to register + */ + def registerDataSet[T](name: String, dataset: DataSet[T]): Unit = { + + val (fieldNames, fieldIndexes) = TranslationContext.getFieldInfo[T](dataset.getType) + val dataSetTable = new DataSetTable[T]( + dataset, + fieldIndexes, + fieldNames + ) + TranslationContext.addAndRegisterDataSet(dataSetTable, name) + } + + /** + * Registers a DataSet under a unique name, so that it can be used in SQL queries. + * The fields of the DataSet type are renamed to the given set of fields. + * + * @param name the Table name + * @param dataset the DataSet to register + * @param fields the Table field names + */ + def registerDataSet[T](name: String, dataset: DataSet[T], fields: String): Unit = { + + val exprs = ExpressionParser + .parseExpressionList(fields) + .toArray + + val (fieldNames, fieldIndexes) = TranslationContext.getFieldInfo[T](dataset.getType, exprs) + val dataSetTable = new DataSetTable[T]( + dataset, + fieldIndexes.toArray, + fieldNames.toArray + ) + TranslationContext.addAndRegisterDataSet(dataSetTable, name) + } + + /** + * Registers a Table under a unique name, so that it can be used in SQL queries. + * @param name the Table name + * @param table the Table to register + */ + def registerTable[T](name: String, table: Table): Unit = { + val tableTable = new TableTable(table.getRelNode()) + TranslationContext.registerTable(tableTable, name) + } + + /** + * Retrieve a registered Table. + * @param tableName the name under which the Table has been registered + * @return the Table object + */ + @throws[TableException] + def scan(tableName: String): Table = { + if (TranslationContext.isRegistered(tableName)) { + val relBuilder = TranslationContext.getRelBuilder + relBuilder.scan(tableName) + new Table(relBuilder.build(), relBuilder) + } + else { + throw new TableException("Table \"" + tableName + "\" was not found in the registry.") --- End diff -- That's much nicer than my Java-ish way :S
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