feat: handle drop request for metric table (#3136)

* handle drop request

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

* adjust procedure manager

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

* add create table sqlness test

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

* insert/query metric table

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

* address CR comments

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

* Update src/common/meta/src/kv_backend.rs

Co-authored-by: JeremyHi <jiachun_feng@proton.me>

* fix clippy

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

* reuse region option for metadata region

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

* tweak variable name

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

---------

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>
Co-authored-by: JeremyHi <jiachun_feng@proton.me>

src/common/meta/src/ddl_manager.rs

@@ -389,15 +389,21 @@ async fn handle_drop_table_task(
     let table_metadata_manager = &ddl_manager.table_metadata_manager();
     let table_ref = drop_table_task.table_ref();
 
-    let (table_info_value, table_route_value) =
-        table_metadata_manager.get_full_table_info(table_id).await?;
+    let table_info_value = table_metadata_manager
+        .table_info_manager()
+        .get(table_id)
+        .await?;
+    let (_, table_route_value) = table_metadata_manager
+        .table_route_manager()
+        .get_physical_table_route(table_id)
+        .await?;
 
     let table_info_value = table_info_value.with_context(|| error::TableInfoNotFoundSnafu {
         table_name: table_ref.to_string(),
     })?;
 
     let table_route_value =
-        table_route_value.context(error::TableRouteNotFoundSnafu { table_id })?;
+        DeserializedValueWithBytes::from_inner(TableRouteValue::Physical(table_route_value));
 
     let id = ddl_manager
         .submit_drop_table_task(

src/common/meta/src/key.rs

@@ -354,6 +354,7 @@ impl TableMetadataManager {
         &self.kv_backend
     }
 
+    // TODO(ruihang): deprecate this
     pub async fn get_full_table_info(
         &self,
         table_id: TableId,

src/common/meta/src/kv_backend.rs

@@ -114,6 +114,7 @@ where
         Ok(!resp.kvs.is_empty())
     }
 
+    /// Returns previous key-value pair if `prev_kv` is `true`.
     async fn delete(&self, key: &[u8], prev_kv: bool) -> Result<Option<KeyValue>, Self::Error> {
         let mut req = DeleteRangeRequest::new().with_key(key.to_vec());
         if prev_kv {