feat: query engine impl on datafusion (#10)

* feat: query engine impl on datafusion

* feat: adds physical_optimizer, physical_planner and executor

* feat: impl adpaters between datafuion and greptime query engine core APIs.

* feat: impl PhysicalPlanAdapter and ExecutionPlanAdapter

* feat: rename table datafusion mod to adapter

* fix: clippy warning

* fix: conflicts with develop branch

* feat: add database mod

* fix: CR comment

* fix: by CR comments

* fix: conflicts with develop branch

* fix: by CR comments

src/datatypes/Cargo.toml

@@ -3,9 +3,8 @@ name = "datatypes"
 version = "0.1.0"
 edition = "2021"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
 [dependencies]
 arrow2 = "0.10"
 common-base = { path = "../common/base" }
 paste = "1.0"
+serde ={ version =  "1.0.136", features = ["derive"] }

src/datatypes/src/lib.rs

@@ -3,7 +3,6 @@
 mod data_type;
 pub mod prelude;
 mod scalars;
-mod schema;
 pub mod type_id;
 mod types;
 pub mod value;
@@ -13,3 +12,4 @@ use arrow2::array::{BinaryArray, MutableBinaryArray};
 
 pub type LargeBinaryArray = BinaryArray<i64>;
 pub type MutableLargeBinaryArray = MutableBinaryArray<i64>;
+pub mod schema;

src/datatypes/src/schema.rs

@@ -1 +1,25 @@
+use std::sync::Arc;
 
+use arrow2::datatypes::Schema as ArrowSchema;
+
+#[derive(Debug, Clone)]
+pub struct Schema {
+    arrow_schema: Arc<ArrowSchema>,
+}
+
+impl Schema {
+    pub fn new(arrow_schema: Arc<ArrowSchema>) -> Self {
+        Self { arrow_schema }
+    }
+    pub fn arrow_schema(&self) -> &Arc<ArrowSchema> {
+        &self.arrow_schema
+    }
+}
+
+pub type SchemaRef = Arc<Schema>;
+
+impl From<Arc<ArrowSchema>> for Schema {
+    fn from(s: Arc<ArrowSchema>) -> Schema {
+        Schema::new(s)
+    }
+}