tianchen92 commented on a change in pull request #7568:
URL: https://github.com/apache/arrow/pull/7568#discussion_r446812811



##########
File path: cpp/src/arrow/ipc/metadata_internal.cc
##########
@@ -257,6 +259,9 @@ Status ConcreteTypeFromFlatbuffer(flatbuf::Type type, const 
void* type_data,
       return Status::OK();
     case flatbuf::Type::Decimal: {
       auto dec_type = static_cast<const flatbuf::Decimal*>(type_data);
+      if (dec_type->bitWidth() != kDecimalBitWidth) {
+        return Status::Invalid("Library only supports 128-bit decimal values");

Review comment:
       sorry, bitWidth should return 128 if no value is set. LGTM

##########
File path: cpp/src/arrow/ipc/metadata_internal.cc
##########
@@ -257,6 +259,9 @@ Status ConcreteTypeFromFlatbuffer(flatbuf::Type type, const 
void* type_data,
       return Status::OK();
     case flatbuf::Type::Decimal: {
       auto dec_type = static_cast<const flatbuf::Decimal*>(type_data);
+      if (dec_type->bitWidth() != kDecimalBitWidth) {
+        return Status::Invalid("Library only supports 128-bit decimal values");

Review comment:
       should also handle the case when bitWidth == null?




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