feat: add decimal value representation (#182)

Author: zhjwpku

LICENSE

@@ -250,6 +250,14 @@ The file src/iceberg/util/visit_type.h contains code adapted from
 
 https://github.com/apache/arrow/blob/main/cpp/src/arrow/visit_type_inline.h
 
+The file src/iceberg/util/decimal.h contains code adapted from
+
+https://github.com/apache/arrow/blob/main/cpp/src/arrow/util/decimal.h
+
+The file src/iceberg/util/decimal.cc contains code adapted from
+
+https://github.com/apache/arrow/blob/main/cpp/src/arrow/util/decimal.cc
+
 Copyright: 2016-2025 The Apache Software Foundation.
 Home page: https://arrow.apache.org/
 License: https://www.apache.org/licenses/LICENSE-2.0

src/iceberg/CMakeLists.txt

@@ -49,6 +49,7 @@ set(ICEBERG_SOURCES
     manifest_reader_internal.cc
     manifest_writer.cc
     arrow_c_data_guard_internal.cc
+    util/decimal.cc
     util/murmurhash3_internal.cc
     util/timepoint.cc
     util/gzip_internal.cc)

src/iceberg/inheritable_metadata.cc

@@ -19,7 +19,6 @@
 
 #include "iceberg/inheritable_metadata.h"
 
-#include <cassert>
 #include <utility>
 
 #include <iceberg/result.h>

src/iceberg/result.h

@@ -32,6 +32,7 @@ enum class ErrorKind {
   kAlreadyExists,
   kCommitStateUnknown,
   kDecompressError,
+  kInvalid,  // For general invalid errors
   kInvalidArgument,
   kInvalidArrowData,
   kInvalidExpression,
@@ -79,6 +80,7 @@ using Status = Result<void>;
 DEFINE_ERROR_FUNCTION(AlreadyExists)
 DEFINE_ERROR_FUNCTION(CommitStateUnknown)
 DEFINE_ERROR_FUNCTION(DecompressError)
+DEFINE_ERROR_FUNCTION(Invalid)
 DEFINE_ERROR_FUNCTION(InvalidArgument)
 DEFINE_ERROR_FUNCTION(InvalidArrowData)
 DEFINE_ERROR_FUNCTION(InvalidExpression)