refactor: remove the SQL execution interfaces in Datanode (#1135)

* refactor: remove the SQL execution interfaces in Datanode

src/script/src/python/engine.rs

@@ -279,7 +279,8 @@ impl Script for PyScript {
             );
             let plan = self
                 .query_engine
-                .statement_to_plan(stmt, Arc::new(QueryContext::new()))
+                .planner()
+                .plan(stmt, QueryContext::arc())
                 .await?;
             let res = self.query_engine.execute(&plan).await?;
             let copr = self.copr.clone();

src/script/src/python/ffi_types/copr.rs

@@ -367,7 +367,8 @@ impl PyQueryEngine {
                 let handle = rt.handle().clone();
                 let res = handle.block_on(async {
                     let plan = engine
-                        .statement_to_plan(stmt, Default::default())
+                        .planner()
+                        .plan(stmt, Default::default())
                         .await
                         .map_err(|e| e.to_string())?;
                     let res = engine

src/script/src/table.rs

@@ -160,7 +160,8 @@ impl ScriptsTable {
 
         let plan = self
             .query_engine
-            .statement_to_plan(stmt, Arc::new(QueryContext::new()))
+            .planner()
+            .plan(stmt, QueryContext::arc())
             .await
             .unwrap();