Merge branch 'branch-24.12' into json-quote-char-parsing-fix

cpp/doxygen/developer_guide/DEVELOPER_GUIDE.md

@@ -1483,6 +1483,17 @@ struct, and therefore `cudf::struct_view` is the data type of a `cudf::column` o
 
 `cudf::type_dispatcher` dispatches to the `struct_view` data type when invoked on a `STRUCT` column.
 
+# Empty Columns
+
+The libcudf columns support empty, typed content. These columns have no data and no validity mask.
+Empty strings or lists columns may or may not contain a child offsets column.
+It is undefined behavior (UB) to access the offsets child of an empty strings or lists column.
+Nested columns like lists and structs may require other children columns to provide the
+nested structure of the empty types.
+
+Use `cudf::make_empty_column()` to create fixed-width and strings columns.
+Use `cudf::empty_like()` to create an empty column from an existing `cudf::column_view`.
+
 # cuIO: file reading and writing
 
 cuIO is a component of libcudf that provides GPU-accelerated reading and writing of data file

java/src/main/java/ai/rapids/cudf/HostMemoryBuffer.java

@@ -255,16 +255,18 @@ public final void copyFromHostBuffer(long destOffset, HostMemoryBuffer srcData,
    * @param destOffset  offset in bytes in this buffer to start copying to
    * @param in input stream to copy bytes from
    * @param byteLength number of bytes to copy
+   * @throws EOFException If there are not enough bytes in the stream to copy.
+   * @throws IOException If there is an error reading from the stream.
    */
-  final void copyFromStream(long destOffset, InputStream in, long byteLength) throws IOException {
+  public final void copyFromStream(long destOffset, InputStream in, long byteLength) throws IOException {
     addressOutOfBoundsCheck(address + destOffset, byteLength, "copy from stream");
     byte[] arrayBuffer = new byte[(int) Math.min(1024 * 128, byteLength)];
     long left = byteLength;
     while (left > 0) {
       int amountToCopy = (int) Math.min(arrayBuffer.length, left);
       int amountRead = in.read(arrayBuffer, 0, amountToCopy);
       if (amountRead < 0) {
-        throw new EOFException();
+        throw new EOFException("Unexpected end of stream, expected " + left + " more bytes");
       }
       setBytes(destOffset, arrayBuffer, 0, amountRead);
       destOffset += amountRead;