From e279bb3d7e5c0f578b4b386d8adbf9b817e2366f Mon Sep 17 00:00:00 2001
From: Andrew Kane <andrew@ankane.org>
Date: Sun, 25 Apr 2021 19:51:35 -0700
Subject: [PATCH] Revert "Use INFINITY instead of DBL_MAX for comparisons"

This reverts commit 0aa39a8c0cd57e7d66e04ccf38226fa865f740e6.
---
 src/ivfbuild.c  | 4 ++--
 src/ivfinsert.c | 4 ++--
 src/ivfkmeans.c | 8 ++++----
 3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/ivfbuild.c b/src/ivfbuild.c
index 34e07aa..228db3c 100644
--- a/src/ivfbuild.c
+++ b/src/ivfbuild.c
@@ -1,6 +1,6 @@
 #include "postgres.h"
 
-#include <math.h>
+#include <float.h>
 
 #include "catalog/index.h"
 #include "ivfflat.h"
@@ -110,7 +110,7 @@ BuildCallback(Relation index, CALLBACK_ITEM_POINTER, Datum *values,
 {
 	IvfflatBuildState *buildstate = (IvfflatBuildState *) state;
 	double		distance;
-	double		minDistance = INFINITY;
+	double		minDistance = DBL_MAX;
 	int			closestCenter = -1;
 	VectorArray centers = buildstate->centers;
 	TupleTableSlot *slot = buildstate->slot;
diff --git a/src/ivfinsert.c b/src/ivfinsert.c
index bd18c4e..fa10f0f 100644
--- a/src/ivfinsert.c
+++ b/src/ivfinsert.c
@@ -1,6 +1,6 @@
 #include "postgres.h"
 
-#include <math.h>
+#include <float.h>
 
 #include "ivfflat.h"
 #include "storage/bufmgr.h"
@@ -15,7 +15,7 @@ FindInsertPage(Relation rel, Datum *values, BlockNumber *insertPage, ListInfo *
 	Page		cpage;
 	IvfflatList list;
 	double		distance;
-	double		minDistance = INFINITY;
+	double		minDistance = DBL_MAX;
 	BlockNumber nextblkno = IVFFLAT_HEAD_BLKNO;
 	FmgrInfo   *procinfo;
 	Oid			collation;
diff --git a/src/ivfkmeans.c b/src/ivfkmeans.c
index 8086ca0..61dd917 100644
--- a/src/ivfkmeans.c
+++ b/src/ivfkmeans.c
@@ -1,6 +1,6 @@
 #include "postgres.h"
 
-#include <math.h>
+#include <float.h>
 
 #include "ivfflat.h"
 #include "miscadmin.h"
@@ -33,7 +33,7 @@ InitCenters(Relation index, VectorArray samples, VectorArray centers, double *lo
 	centers->length++;
 
 	for (j = 0; j < numSamples; j++)
-		weight[j] = INFINITY;
+		weight[j] = DBL_MAX;
 
 	for (i = 0; i < numCenters; i++)
 	{
@@ -219,7 +219,7 @@ ElkanKmeans(Relation index, VectorArray samples, VectorArray centers)
 	/* Assign each x to its closest initial center c(x) = argmin d(x,c) */
 	for (j = 0; j < numSamples; j++)
 	{
-		minDistance = INFINITY;
+		minDistance = DBL_MAX;
 		closestCenter = -1;
 
 		vec = VectorArrayGet(samples, j);
@@ -265,7 +265,7 @@ ElkanKmeans(Relation index, VectorArray samples, VectorArray centers)
 		/* For all centers c, compute s(c) */
 		for (j = 0; j < numCenters; j++)
 		{
-			minDistance = INFINITY;
+			minDistance = DBL_MAX;
 
 			for (k = 0; k < numCenters; k++)
 			{