chore: change Result to Option to avoid bring error stack (#13901)

Author: BohuTANG

src/query/catalog/src/plan/stream_column.rs

@@ -78,12 +78,8 @@ impl StreamTablePart {
         }))
     }
 
-    pub fn from_part(info: &PartInfoPtr) -> Result<&StreamTablePart> {
-        info.as_any()
-            .downcast_ref::<StreamTablePart>()
-            .ok_or(ErrorCode::Internal(
-                "Cannot downcast from PartInfo to StreamTablePart.",
-            ))
+    pub fn from_part(info: &PartInfoPtr) -> Option<&StreamTablePart> {
+        info.as_any().downcast_ref::<StreamTablePart>()
     }
 
     pub fn inner(&self) -> Partitions {

src/query/sql/src/executor/table_read_plan.rs

@@ -113,7 +113,7 @@ impl ToReadDataSourcePlan for dyn Table {
         let mut base_block_ids = None;
         if parts.partitions.len() == 1 {
             let part = parts.partitions[0].clone();
-            if let Ok(part) = StreamTablePart::from_part(&part) {
+            if let Some(part) = StreamTablePart::from_part(&part) {
                 parts = part.inner();
                 base_block_ids = Some(part.base_block_ids());
             }