feat: implement InMemoryCatalog as a subclass of SqlCatalog

Author: hussein-awala

pyiceberg/catalog/memory.py

@@ -0,0 +1,32 @@
+# 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.
+
+from pyiceberg.catalog.sql import SqlCatalog
+
+
+class InMemoryCatalog(SqlCatalog):
+    """
+    An in-memory catalog implementation that uses SqlCatalog with SQLite in-memory database.
+
+    This is useful for test, demo, and playground but not in production as data is not persisted.
+    """
+
+    def __init__(self, name: str, warehouse: str = "file:///tmp/warehouse", **kwargs: str) -> None:
+        self._warehouse_location = warehouse
+        if "uri" not in kwargs:
+            kwargs["uri"] = "sqlite:///:memory:"
+        super().__init__(name=name, warehouse=warehouse, **kwargs)