From 5b86da85f358199d80436005d104607a7fed867d Mon Sep 17 00:00:00 2001
From: Steve Yen <steve.yen@gmail.com>
Date: Tue, 6 Mar 2018 08:06:12 -0800
Subject: [PATCH] scorch zap optimize postings itr with tf/loc reader/decoder
 reuse

---
 index/scorch/segment/zap/posting.go | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/index/scorch/segment/zap/posting.go b/index/scorch/segment/zap/posting.go
index 2dab4166..589c7cb8 100644
--- a/index/scorch/segment/zap/posting.go
+++ b/index/scorch/segment/zap/posting.go
@@ -45,7 +45,25 @@ func (p *PostingsList) iterator(rv *PostingsIterator) *PostingsIterator {
 	if rv == nil {
 		rv = &PostingsIterator{}
 	} else {
+		freqNormReader := rv.freqNormReader
+		if freqNormReader != nil {
+			freqNormReader.Reset([]byte(nil))
+		}
+		freqNormDecoder := rv.freqNormDecoder
+
+		locReader := rv.locReader
+		if locReader != nil {
+			locReader.Reset([]byte(nil))
+		}
+		locDecoder := rv.locDecoder
+
 		*rv = PostingsIterator{} // clear the struct
+
+		rv.freqNormReader = freqNormReader
+		rv.freqNormDecoder = freqNormDecoder
+
+		rv.locReader = locReader
+		rv.locDecoder = locDecoder
 	}
 	rv.postings = p