Github user clohfink commented on a diff in the pull request:
https://github.com/apache/cassandra/pull/284#discussion_r232325693
--- Diff: src/java/org/apache/cassandra/db/virtual/DescribeTables.java ---
@@ -0,0 +1,306 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.cassandra.db.virtual;
+
+import java.nio.ByteBuffer;
+import java.util.Collection;
+import java.util.List;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Streams;
+
+import org.apache.cassandra.cql3.functions.Function;
+import org.apache.cassandra.cql3.functions.FunctionName;
+import org.apache.cassandra.cql3.functions.UDAggregate;
+import org.apache.cassandra.cql3.functions.UDFunction;
+import org.apache.cassandra.db.DecoratedKey;
+import org.apache.cassandra.db.Keyspace;
+import org.apache.cassandra.db.SchemaCQLHelper;
+import org.apache.cassandra.db.marshal.CompositeType;
+import org.apache.cassandra.db.marshal.UTF8Type;
+import org.apache.cassandra.db.marshal.UserType;
+import org.apache.cassandra.dht.LocalPartitioner;
+import org.apache.cassandra.schema.Functions;
+import org.apache.cassandra.schema.IndexMetadata;
+import org.apache.cassandra.schema.Schema;
+import org.apache.cassandra.schema.TableMetadata;
+import org.apache.cassandra.schema.Types;
+import org.apache.cassandra.schema.ViewMetadata;
+import org.apache.cassandra.utils.ByteBufferUtil;
+
+public class DescribeTables
+{
+ private static final String KEYSPACE = "keyspace_name";
+ private static final String CQL = "cql";
+
+ private static final CompositeType utfComposite =
CompositeType.getInstance(UTF8Type.instance, UTF8Type.instance);
+
+ public static Collection<VirtualTable> getAll(String name)
+ {
+ return ImmutableList.of(new DescribeKeyspaceTable(name),
+ new DescribeIndexesTable(name),
+ new DescribeTypesTable(name),
+ new DescribeAggregatesTable(name),
+ new DescribeFunctionsTable(name),
+ new DescribeViewsTable(name),
+ new DescribeTablesTable(name));
+ }
+
+ static final class DescribeKeyspaceTable extends AbstractVirtualTable
+ {
+ DescribeKeyspaceTable(String keyspace)
+ {
+ super(TableMetadata.builder(keyspace, "describe_keyspace")
+ .comment("cql for keyspace metadata")
+ .kind(TableMetadata.Kind.VIRTUAL)
+ .partitioner(new
LocalPartitioner(UTF8Type.instance))
+ .addPartitionKeyColumn(KEYSPACE,
UTF8Type.instance)
+ .addRegularColumn(CQL, UTF8Type.instance)
+ .build());
+ }
+
+ @Override
+ public DataSet data(DecoratedKey partitionKey)
+ {
+ String keyspace =
UTF8Type.instance.compose(partitionKey.getKey());
+
+ SimpleDataSet result = new SimpleDataSet(metadata());
+ result.row(keyspace)
+ .column(CQL, SchemaCQLHelper.getKeyspaceAsCQL(keyspace));
+ return result;
+ }
+
+ public DataSet data()
+ {
+ SimpleDataSet result = new SimpleDataSet(metadata());
+ for (String keyspace : Schema.instance.getKeyspaces())
+ {
+ result.row(keyspace)
+ .column(CQL,
SchemaCQLHelper.getKeyspaceAsCQL(keyspace));
+ }
+ return result;
+ }
+ }
+
+ static abstract class AbstractDescribeTable extends
AbstractVirtualTable
+ {
+ AbstractDescribeTable(String keyspace, String name)
+ {
+ super(TableMetadata.builder(keyspace, "describe_" + name)
--- End diff --
complexity there is there are things like having a UDT with same name as a
table in the same keyspace. We can have something like ((type), keyspace, name)
so that way we can provide uniqueness to everything and it would only be funny
for keyspaces.
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