Copilot commented on code in PR #51692:
URL: https://github.com/apache/arrow/pull/51692#discussion_r4182829895


##########
cpp/src/parquet/column_writer.cc:
##########
@@ -775,11 +778,11 @@ class ColumnWriterImpl {
       compressor_temp_buffer_ =
           std::static_pointer_cast<ResizableBuffer>(AllocateBuffer(allocator_, 
0));
     }
-    if (properties_->content_defined_chunking_enabled()) {
-      auto cdc_options = properties_->content_defined_chunking_options();
-      content_defined_chunker_.emplace(level_info_, cdc_options.min_chunk_size,
-                                       cdc_options.max_chunk_size,
-                                       cdc_options.norm_level);
+    if (properties_->content_defined_chunking_enabled() &&
+        content_defined_chunker_ == nullptr) {
+      throw ParquetException(
+          "Content-defined chunking is not supported in ColumnWriter::Make(), 
use "
+          "ParquetFileWriter instead.");

Review Comment:
   The exported `ColumnWriter::Make()` previously supported CDC by owning its 
chunker, but the public overload now always passes `nullptr`, so existing 
low-level callers with CDC enabled fail at runtime. Preserve that API by having 
the public path create and retain its own chunker; only file-writer-created 
column writers should borrow the file-level chunker.



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