JingsongLi commented on a change in pull request #9971: [FLINK-14490][table]
Add methods for interacting with temporary objects
URL: https://github.com/apache/flink/pull/9971#discussion_r339393982
##########
File path:
flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/descriptors/ConnectTableDescriptor.java
##########
@@ -60,37 +65,98 @@ public ConnectTableDescriptor withSchema(Schema schema) {
* Searches for the specified table source, configures it accordingly,
and registers it as
* a table under the given name.
*
+ * <p>Temporary objects can shadow permanent ones. If a permanent
object in a given path exists, it will
+ * be inaccessible in the current session. To make the permanent object
available again you can drop the
+ * corresponding temporary object.
+ *
* @param name table name to be registered in the table environment
+ * @deprecated use {@link #createTemporaryTable(String)}
*/
+ @Deprecated
public void registerTableSource(String name) {
Preconditions.checkNotNull(name);
TableSource<?> tableSource =
TableFactoryUtil.findAndCreateTableSource(this);
- tableEnv.registerTableSource(name, tableSource);
+ registration.createTableSource(name, tableSource);
}
/**
* Searches for the specified table sink, configures it accordingly,
and registers it as
* a table under the given name.
*
+ * <p>Temporary objects can shadow permanent ones. If a permanent
object in a given path exists, it will
+ * be inaccessible in the current session. To make the permanent object
available again you can drop the
+ * corresponding temporary object.
+ *
* @param name table name to be registered in the table environment
+ * @deprecated use {@link #createTemporaryTable(String)}
*/
+ @Deprecated
public void registerTableSink(String name) {
Preconditions.checkNotNull(name);
TableSink<?> tableSink =
TableFactoryUtil.findAndCreateTableSink(this);
- tableEnv.registerTableSink(name, tableSink);
+ registration.createTableSink(name, tableSink);
}
/**
* Searches for the specified table source and sink, configures them
accordingly, and registers
* them as a table under the given name.
*
+ * <p>Temporary objects can shadow permanent ones. If a permanent
object in a given path exists, it will
+ * be inaccessible in the current session. To make the permanent object
available again you can drop the
+ * corresponding temporary object.
+ *
* @param name table name to be registered in the table environment
+ * @deprecated use {@link #createTemporaryTable(String)}
*/
+ @Deprecated
public void registerTableSourceAndSink(String name) {
registerTableSource(name);
registerTableSink(name);
}
+ /**
+ * Registers the table described by underlying properties in a given
path.
+ *
+ * <p>There is no distinction between source and sink at the descriptor
level anymore as this
+ * method does not perform actual class lookup. It only stores the
underlying properties. The
+ * actual source/sink lookup is performed when the table is used.
+ *
+ * <p>Temporary objects can shadow permanent ones. If a permanent
object in a given path exists, it will
+ * be inaccessible in the current session. To make the permanent object
available again you can drop the
+ * corresponding temporary object.
+ *
+ * <p><b>NOTE:</b> The schema must be explicitly defined.
+ *
+ * @param path path where to register the temporary table
+ */
+ public void createTemporaryTable(String path) {
+ if (schemaDescriptor == null) {
+ throw new TableException(
+ "Table schema must be explicitly defined. To
derive schema from the underlying connector" +
+ " use
registerTableSource/registerTableSink/registerTableSourceAndSink.");
+ }
+
+ Map<String, String> schemaProperties =
schemaDescriptor.toProperties();
+ TableSchema tableSchema = getTableSchema(schemaProperties);
+
+ Map<String, String> properties = new HashMap<>(toProperties());
+ schemaProperties.keySet().forEach(properties::remove);
+
+ CatalogTableImpl catalogTable = new CatalogTableImpl(
Review comment:
Maybe we can use `CatalogTableBuilder` here?
Looks like there some bugs in `CatalogTableBuilder`, it not remove
`schemaProperties` in `properties`?
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