From 945ce9583f1b74a69811299f6685441044815267 Mon Sep 17 00:00:00 2001
From: myang6 <myang6@hdfgroup.org>
Date: Tue, 27 Jan 2026 16:37:02 -0500
Subject: [PATCH] HYRAX-1951, implement a BES key to turn off the compression
 of floating-point data in the fileout netCDF.

---
 modules/fileout_netcdf/FONcArray.cc          | 5 +++++
 modules/fileout_netcdf/FONcNames.h           | 3 +++
 modules/fileout_netcdf/FONcRequestHandler.cc | 3 +++
 modules/fileout_netcdf/FONcRequestHandler.h  | 1 +
 4 files changed, 12 insertions(+)

diff --git a/modules/fileout_netcdf/FONcArray.cc b/modules/fileout_netcdf/FONcArray.cc
index 8ba73ec086..d8d952777b 100644
--- a/modules/fileout_netcdf/FONcArray.cc
+++ b/modules/fileout_netcdf/FONcArray.cc
@@ -699,6 +699,10 @@ void FONcArray::define(int ncid) {
                         FONcRequestHandler::use_shuffle)                
                         shuffle = 1;
                     
+                    if (NC_SHORT == d_array_type || NC_USHORT == d_array_type || NC_INT == d_array_type ||
+                        NC_UINT == d_array_type || NC_INT64 == d_array_type || NC_UINT64 == d_array_type ||
+                        FONcRequestHandler::no_use_compression_for_float == false) {               
+                    
                     int deflate = 1;
                     int deflate_level = 4;
                     stax = nc_def_var_deflate(ncid, d_varid, shuffle, deflate, deflate_level);
@@ -708,6 +712,7 @@ void FONcArray::define(int ncid) {
                                      + d_varname;
                         FONcUtils::handle_error(stax, err, __FILE__, __LINE__);
                     }
+                    }
                 }
 
                 // We find that increasing the chunk cache size only benefits large-size character array for NASA files. 
diff --git a/modules/fileout_netcdf/FONcNames.h b/modules/fileout_netcdf/FONcNames.h
index b5c7cb5b79..ea58d35935 100644
--- a/modules/fileout_netcdf/FONcNames.h
+++ b/modules/fileout_netcdf/FONcNames.h
@@ -43,6 +43,9 @@
 #define FONC_NC3_CLASSIC_FORMAT false
 #define FONC_NC3_CLASSIC_FORMAT_KEY "FONc.NC3ClassicFormat"
 
+#define FONC_NO_COMPRESSION_FLOAT false
+#define FONC_NO_COMPRESSION_FLOAT_KEY "FONc.NoCompressionForFloat"
+
 #define FONC_RETURN_AS_NETCDF3 "netcdf"
 #define FONC_RETURN_AS_NETCDF4 "netcdf-4"
 #define FONC_NC4_CLASSIC_MODEL "NC4_CLASSIC_MODEL"
diff --git a/modules/fileout_netcdf/FONcRequestHandler.cc b/modules/fileout_netcdf/FONcRequestHandler.cc
index 13b4fe7989..cd23f78397 100644
--- a/modules/fileout_netcdf/FONcRequestHandler.cc
+++ b/modules/fileout_netcdf/FONcRequestHandler.cc
@@ -51,6 +51,7 @@ std::string FONcRequestHandler::temp_dir;
 bool FONcRequestHandler::byte_to_short;
 bool FONcRequestHandler::use_compression;
 bool FONcRequestHandler::use_shuffle;
+bool FONcRequestHandler::no_use_compression_for_float;
 unsigned long long  FONcRequestHandler::chunk_size;
 bool FONcRequestHandler::classic_model;
 bool FONcRequestHandler::reduce_dim;
@@ -159,6 +160,8 @@ FONcRequestHandler::FONcRequestHandler( const string &name )
 
     read_key_value(FONC_USE_SHUFFLE_KEY, FONcRequestHandler::use_shuffle, FONC_USE_SHUFFLE);
 
+    read_key_value(FONC_NO_COMPRESSION_FLOAT_KEY, FONcRequestHandler::no_use_compression_for_float, FONC_NO_COMPRESSION_FLOAT);
+
     read_key_value(FONC_CHUNK_SIZE_KEY, FONcRequestHandler::chunk_size, FONC_CHUNK_SIZE);
 
     read_key_value(FONC_CLASSIC_MODEL_KEY, FONcRequestHandler::classic_model, FONC_CLASSIC_MODEL);
diff --git a/modules/fileout_netcdf/FONcRequestHandler.h b/modules/fileout_netcdf/FONcRequestHandler.h
index 8f3b17cd0c..5e197d4fdb 100644
--- a/modules/fileout_netcdf/FONcRequestHandler.h
+++ b/modules/fileout_netcdf/FONcRequestHandler.h
@@ -53,6 +53,7 @@ class FONcRequestHandler: public BESRequestHandler {
     static bool byte_to_short;
     static bool use_compression;
     static bool use_shuffle;
+    static bool no_use_compression_for_float;
     static unsigned long long chunk_size;
     static bool classic_model;
     static bool reduce_dim;