From e4758e0183139c0a236138e1d6252b2983d71d51 Mon Sep 17 00:00:00 2001
From: AlexDuan <417921451@qq.com>
Date: Fri, 10 Sep 2021 12:59:50 +0800
Subject: [PATCH] ifndef MPI then define

---
 src/query/inc/tdigest.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/query/inc/tdigest.h b/src/query/inc/tdigest.h
index 582ad338ac..ef347f1b9e 100644
--- a/src/query/inc/tdigest.h
+++ b/src/query/inc/tdigest.h
@@ -22,6 +22,10 @@
 #ifndef TDIGEST_H
 #define TDIGEST_H
 
+#ifndef M_PI
+#define M_PI        3.14159265358979323846264338327950288   /* pi             */
+#endif
+
 #define COMPRESSION 400
 #define GET_CENTROID(compression)  (ceil(compression * M_PI / 2) + 1)
 #define GET_THRESHOLD(compression) (7.5 + 0.37 * compression - 2e-4 * pow(compression, 2))
-- 
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