diff --git a/Cargo.lock b/Cargo.lock
index c4b2612875..64e3fa91ca 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,23 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "async-trait"
+version = "0.1.53"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed6aa3524a2dfcf9fe180c51eae2b58738348d819517ceadf95789c51fff7600"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
 [[package]]
 name = "common"
 version = "0.1.0"
@@ -9,23 +26,136 @@ version = "0.1.0"
 [[package]]
 name = "datanode"
 version = "0.1.0"
+dependencies = [
+ "snafu",
+]
 
 [[package]]
 name = "datatypes"
 version = "0.1.0"
 
+[[package]]
+name = "doc-comment"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fea41bba32d969b513997752735605054bc0dfa92b4c56bf1189f2e174be7a10"
+
+[[package]]
+name = "heck"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6d621efb26863f0e9924c6ac577e8275e5e6b77455db64ffa6c65c904e9e132c"
+dependencies = [
+ "unicode-segmentation",
+]
+
+[[package]]
+name = "log"
+version = "0.4.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6389c490849ff5bc16be905ae24bc913a9c8892e19b2341dbc175e14c341c2b8"
+dependencies = [
+ "cfg-if",
+]
+
 [[package]]
 name = "log-store"
 version = "0.1.0"
 
+[[package]]
+name = "logical-plans"
+version = "0.1.0"
+
 [[package]]
 name = "object-store"
 version = "0.1.0"
 
+[[package]]
+name = "proc-macro2"
+version = "1.0.37"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec757218438d5fda206afc041538b2f6d889286160d649a86a24d37e1235afd1"
+dependencies = [
+ "unicode-xid",
+]
+
 [[package]]
 name = "query"
 version = "0.1.0"
 
+[[package]]
+name = "quote"
+version = "1.0.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1feb54ed693b93a84e14094943b84b7c4eae204c512b7ccb95ab0c66d278ad1"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "snafu"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2eba135d2c579aa65364522eb78590cdf703176ef71ad4c32b00f58f7afb2df5"
+dependencies = [
+ "doc-comment",
+ "snafu-derive",
+]
+
+[[package]]
+name = "snafu-derive"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a7fe9b0669ef117c5cabc5549638528f36771f058ff977d7689deb517833a75"
+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "sql"
+version = "0.1.0"
+dependencies = [
+ "sqlparser",
+]
+
+[[package]]
+name = "sqlparser"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7e9a527b68048eb95495a1508f6c8395c8defcff5ecdbe8ad4106d08a2ef2a3c"
+dependencies = [
+ "log",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.91"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b683b2b825c8eef438b77c36a06dc262294da3d5a5813fac20da149241dcd44d"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
 [[package]]
 name = "table"
 version = "0.1.0"
+dependencies = [
+ "async-trait",
+]
+
+[[package]]
+name = "unicode-segmentation"
+version = "1.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7e8820f5d777f6224dc4be3632222971ac30164d4a258d595640799554ebfd99"
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
diff --git a/Cargo.toml b/Cargo.toml
index 7da6ac97a7..b63440d6e3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,7 +4,9 @@ members = [
     "src/datanode",
     "src/datatypes",
     "src/log-store",
+    "src/logical-plans",
     "src/object-store",
     "src/query",
+    "src/sql",
     "src/table",
 ]
diff --git a/src/datanode/Cargo.toml b/src/datanode/Cargo.toml
index c8417dd799..ec6162f968 100644
--- a/src/datanode/Cargo.toml
+++ b/src/datanode/Cargo.toml
@@ -6,3 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+snafu = "0.7"
diff --git a/src/datanode/src/catalog.rs b/src/datanode/src/catalog.rs
new file mode 100644
index 0000000000..8b13789179
--- /dev/null
+++ b/src/datanode/src/catalog.rs
@@ -0,0 +1 @@
+
diff --git a/src/datanode/src/error.rs b/src/datanode/src/error.rs
new file mode 100644
index 0000000000..d7815b56db
--- /dev/null
+++ b/src/datanode/src/error.rs
@@ -0,0 +1,8 @@
+use snafu::Snafu;
+
+/// business error of datanode.
+#[derive(Debug, Snafu)]
+#[snafu(display("DataNode error"))]
+pub struct Error;
+
+pub type Result<T> = std::result::Result<T, Error>;
diff --git a/src/datanode/src/lib.rs b/src/datanode/src/lib.rs
index 8b13789179..f12076ea06 100644
--- a/src/datanode/src/lib.rs
+++ b/src/datanode/src/lib.rs
@@ -1 +1,21 @@
+mod catalog;
+mod error;
+mod processors;
+mod rpc;
 
+use crate::error::Result;
+use crate::rpc::Services;
+
+/// DataNode service.
+pub struct DataNode {
+    services: Services,
+}
+
+impl DataNode {
+    /// Shutdown the datanode service gracefully.
+    pub async fn shutdown(&self) -> Result<()> {
+        self.services.shutdown().await?;
+
+        unimplemented!()
+    }
+}
diff --git a/src/datanode/src/processors.rs b/src/datanode/src/processors.rs
new file mode 100644
index 0000000000..8b13789179
--- /dev/null
+++ b/src/datanode/src/processors.rs
@@ -0,0 +1 @@
+
diff --git a/src/datanode/src/rpc.rs b/src/datanode/src/rpc.rs
new file mode 100644
index 0000000000..ef06c5b171
--- /dev/null
+++ b/src/datanode/src/rpc.rs
@@ -0,0 +1,10 @@
+use crate::error::Result;
+
+/// All rpc services.
+pub struct Services {}
+
+impl Services {
+    pub async fn shutdown(&self) -> Result<()> {
+        unimplemented!()
+    }
+}
diff --git a/src/datatypes/src/lib.rs b/src/datatypes/src/lib.rs
index e69de29bb2..6bde67a2b1 100644
--- a/src/datatypes/src/lib.rs
+++ b/src/datatypes/src/lib.rs
@@ -0,0 +1 @@
+mod schema;
diff --git a/src/datatypes/src/schema.rs b/src/datatypes/src/schema.rs
new file mode 100644
index 0000000000..8b13789179
--- /dev/null
+++ b/src/datatypes/src/schema.rs
@@ -0,0 +1 @@
+
diff --git a/src/logical-plans/Cargo.toml b/src/logical-plans/Cargo.toml
new file mode 100644
index 0000000000..fd20e3350b
--- /dev/null
+++ b/src/logical-plans/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "logical-plans"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/src/logical-plans/src/lib.rs b/src/logical-plans/src/lib.rs
new file mode 100644
index 0000000000..8b13789179
--- /dev/null
+++ b/src/logical-plans/src/lib.rs
@@ -0,0 +1 @@
+
diff --git a/src/query/src/executor.rs b/src/query/src/executor.rs
new file mode 100644
index 0000000000..8b13789179
--- /dev/null
+++ b/src/query/src/executor.rs
@@ -0,0 +1 @@
+
diff --git a/src/query/src/lib.rs b/src/query/src/lib.rs
index 8b13789179..c7de888be0 100644
--- a/src/query/src/lib.rs
+++ b/src/query/src/lib.rs
@@ -1 +1,4 @@
-
+mod executor;
+mod logical_optimizer;
+mod physical_optimizer;
+mod physical_planner;
diff --git a/src/query/src/logical_optimizer.rs b/src/query/src/logical_optimizer.rs
new file mode 100644
index 0000000000..8b13789179
--- /dev/null
+++ b/src/query/src/logical_optimizer.rs
@@ -0,0 +1 @@
+
diff --git a/src/query/src/physical_optimizer.rs b/src/query/src/physical_optimizer.rs
new file mode 100644
index 0000000000..8b13789179
--- /dev/null
+++ b/src/query/src/physical_optimizer.rs
@@ -0,0 +1 @@
+
diff --git a/src/query/src/physical_planner.rs b/src/query/src/physical_planner.rs
new file mode 100644
index 0000000000..8b13789179
--- /dev/null
+++ b/src/query/src/physical_planner.rs
@@ -0,0 +1 @@
+
diff --git a/src/sql/Cargo.toml b/src/sql/Cargo.toml
new file mode 100644
index 0000000000..01cdc0da6d
--- /dev/null
+++ b/src/sql/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "sql"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+sqlparser = "0.16.0"
diff --git a/src/sql/src/ast.rs b/src/sql/src/ast.rs
new file mode 100644
index 0000000000..8b13789179
--- /dev/null
+++ b/src/sql/src/ast.rs
@@ -0,0 +1 @@
+
diff --git a/src/sql/src/lib.rs b/src/sql/src/lib.rs
new file mode 100644
index 0000000000..c289ce327f
--- /dev/null
+++ b/src/sql/src/lib.rs
@@ -0,0 +1,3 @@
+mod ast;
+mod parser;
+mod planner;
diff --git a/src/sql/src/parser.rs b/src/sql/src/parser.rs
new file mode 100644
index 0000000000..8b13789179
--- /dev/null
+++ b/src/sql/src/parser.rs
@@ -0,0 +1 @@
+
diff --git a/src/sql/src/planner.rs b/src/sql/src/planner.rs
new file mode 100644
index 0000000000..8b13789179
--- /dev/null
+++ b/src/sql/src/planner.rs
@@ -0,0 +1 @@
+
diff --git a/src/table/Cargo.toml b/src/table/Cargo.toml
index 12933c68f0..6ee53b9861 100644
--- a/src/table/Cargo.toml
+++ b/src/table/Cargo.toml
@@ -6,3 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+async-trait = "0.1"
diff --git a/src/table/src/engine.rs b/src/table/src/engine.rs
new file mode 100644
index 0000000000..8b2309192c
--- /dev/null
+++ b/src/table/src/engine.rs
@@ -0,0 +1,3 @@
+/// Table engine abstraction.
+#[async_trait::async_trait]
+pub trait Engine {}
diff --git a/src/table/src/lib.rs b/src/table/src/lib.rs
index 8b13789179..804f6c9a68 100644
--- a/src/table/src/lib.rs
+++ b/src/table/src/lib.rs
@@ -1 +1,5 @@
+mod engine;
 
+/// Table abstraction.
+#[async_trait::async_trait]
+pub trait Table: Send + Sync {}