From 6e7de3c8d922b4b75db0ba1f80f2c676c4b36e4f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Albert=C2=B7Gou?= <ggq89@qq.com>
Date: Fri, 11 Sep 2020 16:52:48 +0800
Subject: [PATCH 1/3] optimize definition of state_heights

In the same parentstateroot, the one with the smallest height should be selected
---
 cmd/lotus-chainwatch/syncer/sync.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/cmd/lotus-chainwatch/syncer/sync.go b/cmd/lotus-chainwatch/syncer/sync.go
index 52a36fc9e..306cf8b3e 100644
--- a/cmd/lotus-chainwatch/syncer/sync.go
+++ b/cmd/lotus-chainwatch/syncer/sync.go
@@ -136,7 +136,8 @@ create unique index if not exists block_cid_uindex
 	on blocks (cid,height);
 
 create materialized view if not exists state_heights
-    as select distinct height, parentstateroot from blocks;
+    as select b.parentstateroot, min(b.height) height
+	from blocks b group by b.parentstateroot;
 
 create index if not exists state_heights_height_index
 	on state_heights (height);

From e45a7749b0d03c98fef4dd160edefff89306fe42 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Albert=C2=B7Gou?= <ggq89@qq.com>
Date: Mon, 14 Sep 2020 16:20:01 +0800
Subject: [PATCH 2/3] Update sync.go

---
 cmd/lotus-chainwatch/syncer/sync.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/cmd/lotus-chainwatch/syncer/sync.go b/cmd/lotus-chainwatch/syncer/sync.go
index 306cf8b3e..19ceddda9 100644
--- a/cmd/lotus-chainwatch/syncer/sync.go
+++ b/cmd/lotus-chainwatch/syncer/sync.go
@@ -5,6 +5,7 @@ import (
 	"context"
 	"database/sql"
 	"fmt"
+	cid "github.com/ipfs/go-cid/_rsrch/cidiface"
 	"sync"
 	"time"
 
@@ -136,7 +137,7 @@ create unique index if not exists block_cid_uindex
 	on blocks (cid,height);
 
 create materialized view if not exists state_heights
-    as select b.parentstateroot, min(b.height) height
+    as select min(b.height) height, b.parentstateroot
 	from blocks b group by b.parentstateroot;
 
 create index if not exists state_heights_height_index

From 747b34c2c89d83b91bdb45d279e58c4329aa181a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Albert=C2=B7Gou?= <ggq89@qq.com>
Date: Mon, 14 Sep 2020 18:00:17 +0800
Subject: [PATCH 3/3] Update sync.go

---
 cmd/lotus-chainwatch/syncer/sync.go | 1 -
 1 file changed, 1 deletion(-)

diff --git a/cmd/lotus-chainwatch/syncer/sync.go b/cmd/lotus-chainwatch/syncer/sync.go
index 19ceddda9..609b71088 100644
--- a/cmd/lotus-chainwatch/syncer/sync.go
+++ b/cmd/lotus-chainwatch/syncer/sync.go
@@ -5,7 +5,6 @@ import (
 	"context"
 	"database/sql"
 	"fmt"
-	cid "github.com/ipfs/go-cid/_rsrch/cidiface"
 	"sync"
 	"time"