chore: initialize mito2 crate (#1875)

Cargo.toml

@@ -33,6 +33,7 @@ members = [
     "src/meta-client",
     "src/meta-srv",
     "src/mito",
+    "src/mito2",
     "src/object-store",
     "src/partition",
     "src/promql",

src/mito2/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "mito2"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+
+[dependencies]

src/mito2/README.md

@@ -0,0 +1,9 @@
+# Mito
+
+Mito is GreptimeDB's default region engine.
+
+## About Mito
+The Alfa Romeo [MiTo](https://en.wikipedia.org/wiki/Alfa_Romeo_MiTo) is a front-wheel drive, three-door supermini designed by Centro Stile Alfa Romeo.
+
+> "You can't be a true petrolhead until you've owned an Alfa Romeo."
+> <div align="right">-- by Jeremy Clarkson</div>

src/mito2/src/engine.rs

@@ -0,0 +1,17 @@
+// Copyright 2023 Greptime Team
+//
+// Licensed 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.
+
+/// Region engine implementation for timeseries data.
+#[derive(Clone)]
+pub struct MitoEngine {}

src/mito2/src/lib.rs

@@ -0,0 +1,15 @@
+// Copyright 2023 Greptime Team
+//
+// Licensed 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.
+
+pub mod engine;