From 69a8793fa40d4785762cc00379aeaa01b3bf28ff Mon Sep 17 00:00:00 2001
From: Jasmina Malicevic <jasmina.dustinac@gmail.com>
Date: Thu, 22 Dec 2022 00:01:10 +0100
Subject: [PATCH] Added clarification comments

---
 state/indexer/block/kv/util.go | 4 ++++
 state/indexer/query_range.go   | 3 ++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/state/indexer/block/kv/util.go b/state/indexer/block/kv/util.go
index 3eac2d7b0..0f72a0f8d 100644
--- a/state/indexer/block/kv/util.go
+++ b/state/indexer/block/kv/util.go
@@ -142,6 +142,10 @@ func lookForHeight(conditions []query.Condition) (int64, bool, int) {
 	return 0, false, -1
 }
 
+// Remove all occurrences of height equality queries except one. While we are traversing the conditions, check whether the only condition in
+// addition to match events is the height equality or height range query. At the same time, if we do have a height range condition
+// ignore the height equality condition. If a height equality exists, place the condition index in the query and the desired height
+// into the heightInfo struct
 func dedupHeight(conditions []query.Condition) (dedupConditions []query.Condition, heightInfo HeightInfo, found bool) {
 	heightInfo.heightEqIdx = -1
 	heightRangeExists := false
diff --git a/state/indexer/query_range.go b/state/indexer/query_range.go
index 98931a799..5b75c04b5 100644
--- a/state/indexer/query_range.go
+++ b/state/indexer/query_range.go
@@ -77,7 +77,8 @@ func (qr QueryRange) UpperBoundValue() interface{} {
 }
 
 // LookForRanges returns a mapping of QueryRanges and the matching indexes in
-// the provided query conditions.
+// the provided query conditions. If we are matching attributes within events
+// we need to remember the height range from the condition
 func LookForRanges(conditions []query.Condition) (ranges QueryRanges, indexes []int, heightRange QueryRange) {
 	ranges = make(QueryRanges)
 	for i, c := range conditions {