core/filtermaps: fix log value search range

core/filtermaps/filtermaps.go

@@ -662,15 +662,11 @@ func (f *FilterMaps) mapRowIndex(mapIndex, rowIndex uint32) uint64 {
 }
 
 // getBlockLvPointer returns the starting log value index where the log values
-// generated by the given block are located. If blockNumber is beyond the current
-// head then the first unoccupied log value index is returned.
+// generated by the given block are located.
 //
 // Note that this function assumes that the indexer read lock is being held when
 // called from outside the indexerLoop goroutine.
 func (f *FilterMaps) getBlockLvPointer(blockNumber uint64) (uint64, error) {
-	if blockNumber >= f.indexedRange.blocks.AfterLast() && f.indexedRange.headIndexed {
-		return f.indexedRange.headDelimiter + 1, nil
-	}
 	if lvPointer, ok := f.lvPointerCache.Get(blockNumber); ok {
 		return lvPointer, nil
 	}

core/filtermaps/matcher_backend.go

@@ -82,13 +82,26 @@ func (fm *FilterMapsMatcherBackend) GetFilterMapRow(ctx context.Context, mapInde
 }
 
 // GetBlockLvPointer returns the starting log value index where the log values
-// generated by the given block are located. If blockNumber is beyond the current
-// head then the first unoccupied log value index is returned.
+// generated by the given block are located. If blockNumber is beyond the last
+// indexed block then the pointer will point right after this block, ensuring
+// that the matcher does not fail and can return a set of results where the
+// valid range is correct.
 // GetBlockLvPointer implements MatcherBackend.
 func (fm *FilterMapsMatcherBackend) GetBlockLvPointer(ctx context.Context, blockNumber uint64) (uint64, error) {
 	fm.f.indexLock.RLock()
 	defer fm.f.indexLock.RUnlock()
 
+	if blockNumber >= fm.f.indexedRange.blocks.AfterLast() {
+		if fm.f.indexedRange.headIndexed {
+			// return index after head block
+			return fm.f.indexedRange.headDelimiter + 1, nil
+		}
+		if fm.f.indexedRange.blocks.Count() > 0 {
+			// return index at the beginning of the last, partially indexed
+			// block (after the last fully indexed one)
+			blockNumber = fm.f.indexedRange.blocks.Last()
+		}
+	}
 	return fm.f.getBlockLvPointer(blockNumber)
 }