add comment for SetData

mapleFU · May 7, 2024 · ddd0cde · ddd0cde
1 parent 788bbed
commit ddd0cde
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/cpp/src/parquet/encoding.h b/cpp/src/parquet/encoding.h
@@ -255,6 +255,10 @@ class Decoder {
 
   // Sets the data for a new page. This will be called multiple times on the same
   // decoder and should reset all internal state.
+  //
+  // In current implementations, `num_values` is the `num_values` field in the
+  // data page header, which may greater than the number of values in the data
+  // buffer.
   virtual void SetData(int num_values, const uint8_t* data, int len) = 0;
 
   // Returns the number of values left (for the last call to SetData()). This is