add index to event.emitter_addr

chain/events/filter/index.go

@@ -46,6 +46,7 @@ var ddls = []string{
 	)`,
 
 	`CREATE INDEX IF NOT EXISTS height_tipset_key ON event (height,tipset_key)`,
+	`CREATE INDEX IF NOT EXISTS event_emitter_addr ON event (emitter_addr)`,
 
 	`CREATE TABLE IF NOT EXISTS event_entry (
 		event_id INTEGER,
@@ -327,7 +328,8 @@ func NewEventIndex(ctx context.Context, path string, chainStore *store.ChainStor
 		if version == 2 {
 			log.Infof("upgrading event index from version 1 to version 2")
 
-			// to upgrade to version 3 we only need to create an index on the event entries table (key) column
+			// to upgrade to version 3 we only need to create an index on the event_entry.key column
+			// and on the event.emitter_addr column
 			// which means we can just reapply the schema (it will not have any effect on existing data)
 			for _, ddl := range ddls {
 				if _, err := db.Exec(ddl); err != nil {