[Doc] Update partial update desc in Change data through loading doc (#…

…33112) Signed-off-by: amber-create <[email protected]> (cherry picked from commit dfb8656)
StarRocks · Oct 19, 2023 · c0a87a3 · c0a87a3
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diff --git a/docs/loading/Load_to_Primary_Key_tables.md b/docs/loading/Load_to_Primary_Key_tables.md
@@ -459,6 +459,10 @@ As shown in the preceding query result, the record whose `id` is `101` in `examp
 
 Since v2.2, StarRocks supports updating only the specified columns of a table that uses the Primary Key table. This section uses CSV as an example to describe how to perform partial updates.
 
+> **NOTICE**
+>
+> When you perform a partial update, if the row to be updated does not exist, StarRocks inserts a new row, and fills default values in fields that are empty because no data updates are inserted into them.
+
 ### Data examples
 
 1. Prepare a data file.