From 02994bccd5c92fa3c8c214d1eedcb370ff7ebd39 Mon Sep 17 00:00:00 2001
From: Erica Fischer <enf@felt.com>
Date: Fri, 11 Apr 2025 10:35:53 -0700
Subject: [PATCH] Get rid of the "segment" field of the index, which is no
 longer used

---
 main.hpp   | 11 ++++++-----
 serial.cpp |  1 -
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/main.hpp b/main.hpp
index 714af5c3..6b979cfa 100644
--- a/main.hpp
+++ b/main.hpp
@@ -11,15 +11,16 @@
 #include "serial.hpp"
 
 struct index {
-	long long start = 0;
+	long long start = 0;  // offset of data in geom file
 	long long end = 0;
-	unsigned long long ix = 0;
-	short segment = 0;
-	unsigned short t : 2;
-	unsigned long long seq : (64 - 18);  // pack with segment and t to stay in 32 bytes
+	unsigned long long ix = 0;		// quadkey or hilbert index
+	unsigned short t : 2;			// geometry type
+	unsigned short dup : 8;			// instance number of identical geometry
+	unsigned long long seq : (64 - 2 - 8);	// input sequence number; pack with t and dup to stay in 32 bytes
 
 	index()
 	    : t(0),
+	      dup(0),
 	      seq(0) {
 	}
 };
diff --git a/serial.cpp b/serial.cpp
index 5afc2ed2..224cd886 100644
--- a/serial.cpp
+++ b/serial.cpp
@@ -882,7 +882,6 @@ int serialize_feature(struct serialization_state *sst, serial_feature &sf, std::
 	struct index index;
 	index.start = geomstart;
 	index.end = r->geompos;
-	index.segment = sst->segment;
 	index.seq = *(sst->layer_seq);
 	index.t = sf.t;
 	index.ix = bbox_index;