MINOR: [C++][Parquet] fix dict_length for ReadDictionary when not hav…

…ing dict (apache#41344) ### Rationale for this change `dictionary_length = 0` is used when page doesn't have dictionary, however, this should be a nop. ### What changes are included in this PR? Change `dictionary_length = 0` to `*dictionary_length = 0`. ### Are these changes tested? No? ### Are there any user-facing changes? no Authored-by: mwish <[email protected]> Signed-off-by: mwish <[email protected]>
mathworks · Apr 25, 2024 · 774f10d · 774f10d
1 parent 610ab9c
commit 774f10d
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/cpp/src/parquet/column_reader.cc b/cpp/src/parquet/column_reader.cc
@@ -1340,7 +1340,7 @@ class TypedRecordReader : public TypedColumnReaderImpl<DType>,
 
   const void* ReadDictionary(int32_t* dictionary_length) override {
     if (this->current_decoder_ == nullptr && !this->HasNextInternal()) {
-      dictionary_length = 0;
+      *dictionary_length = 0;
       return nullptr;
     }
     // Verify the current data page is dictionary encoded. The current_encoding_ should