refactor: Restructure project layout and clean up dependencies (#30)

This commit introduces a significant reorganization of the project structure to improve maintainability and clarity.

Key changes include:
- Adjusted the directory layout for a more logical module organization.
- Removed unused crate dependencies, reducing the overall project size and potentially speeding up build times.
- Updated import paths and configuration files to reflect the structural changes.

crates/s3select-api/src/query/logical_planner.rs

@@ -0,0 +1,54 @@
+// Copyright 2024 RustFS 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.
+
+use async_trait::async_trait;
+use datafusion::arrow::datatypes::SchemaRef;
+use datafusion::logical_expr::LogicalPlan as DFPlan;
+
+use crate::QueryResult;
+
+use super::ast::ExtStatement;
+use super::session::SessionCtx;
+
+#[derive(Clone)]
+pub enum Plan {
+    // only support query sql
+    /// Query plan
+    Query(QueryPlan),
+}
+
+impl Plan {
+    pub fn schema(&self) -> SchemaRef {
+        match self {
+            Self::Query(p) => SchemaRef::from(p.df_plan.schema().as_ref().to_owned()),
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct QueryPlan {
+    pub df_plan: DFPlan,
+    pub is_tag_scan: bool,
+}
+
+impl QueryPlan {
+    pub fn is_explain(&self) -> bool {
+        matches!(self.df_plan, DFPlan::Explain(_) | DFPlan::Analyze(_))
+    }
+}
+
+#[async_trait]
+pub trait LogicalPlanner {
+    async fn create_logical_plan(&self, statement: ExtStatement, session: &SessionCtx) -> QueryResult<Plan>;
+}