filer: fail the request, not the process, when chunks cannot be resolved (#11685)

* filer: fail the request, not the process, when chunks cannot be resolved

CompactFileChunks and ViewFromChunks discarded the error from
NonOverlappingVisibleIntervals and iterated the nil interval list it
returns on failure. A CreateEntry or UpdateEntry whose context was
cancelled therefore panicked in SeparateGarbageChunks and took the whole
filer down, losing the metadata log it had not yet flushed.

Both functions now return the error. cleanupChunks fails the request
with it, the mount flush paths return it, the replication sinks and the
S3 SSE range reader return it, and a ChunkStreamReader that cannot build
its view fails every read with it and reports it as its SourceError
instead of reading as an empty file.

Fixes #11682

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* filer: propagate chunk resolution failures in scan paths

NonOverlappingVisibleIntervals can fail without a cancelled context; the
query engine and log-store callers discarded the error and dereferenced
nil intervals.

* query: propagate chunk resolution errors instead of skipping files

When a manifest cannot be resolved, ReadParquetStatistics,
countLiveLogRowsExcludingParquetSources, and computeLiveLogMinMax logged a
warning and skipped the failed file, so queries returned understated counts
and wrong min/max values. Surface the errors instead: the fast-path
aggregation collector now returns a DataSourceError so the engine falls
back to a full scan, and the row-count helpers return the error rather
than a partial total.

---------

Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Co-authored-by: Chris Lu <chrislusf@users.noreply.github.com>
Co-authored-by: Chris Lu <chris.lu@gmail.com>

weed/query/engine/engine.go

@@ -3894,8 +3894,7 @@ func (e *SQLEngine) computeLiveLogMinMax(partitionPath string, columnName string
 		// Scan this log file for MIN/MAX values
 		fileMin, fileMax, err := e.computeFileMinMax(filerClient, filePath, columnName)
 		if err != nil {
-			fmt.Printf("Warning: failed to compute min/max for file %s: %v\n", filePath, err)
-			return nil // Continue with other files
+			return err
 		}
 
 		// Update global min/max
@@ -4030,7 +4029,10 @@ func (e *SQLEngine) eachLogEntryInFile(filerClient filer_pb.FilerClient, filePat
 
 	// Read file chunks and process them (pattern from countRowsInLogFile)
 	fileSize := filer.FileSize(fileEntry)
-	visibleIntervals, _ := filer.NonOverlappingVisibleIntervals(context.Background(), lookupFileIdFn, fileEntry.Chunks, 0, int64(fileSize))
+	visibleIntervals, err := filer.NonOverlappingVisibleIntervals(context.Background(), lookupFileIdFn, fileEntry.Chunks, 0, int64(fileSize))
+	if err != nil {
+		return err
+	}
 	chunkViews := filer.ViewFromVisibleIntervals(visibleIntervals, 0, int64(fileSize))
 
 	for x := chunkViews.Front(); x != nil; x = x.Next {
@@ -4185,8 +4187,7 @@ func (e *SQLEngine) countLiveLogRowsExcludingParquetSources(ctx context.Context,
 		// Count rows in live log file
 		rowCount, err := e.countRowsInLogFile(filerClient, partitionPath, entry)
 		if err != nil {
-			fmt.Printf("Warning: failed to count rows in %s/%s: %v\n", partitionPath, entry.Name, err)
-			return nil // Continue with other files
+			return err
 		}
 		totalRows += rowCount
 		return nil
@@ -4354,7 +4355,10 @@ func (e *SQLEngine) countRowsInLogFile(filerClient filer_pb.FilerClient, partiti
 
 	// Read file chunks and process them (pattern from read_log_from_disk.go)
 	fileSize := filer.FileSize(entry)
-	visibleIntervals, _ := filer.NonOverlappingVisibleIntervals(context.Background(), lookupFileIdFn, entry.Chunks, 0, int64(fileSize))
+	visibleIntervals, err := filer.NonOverlappingVisibleIntervals(context.Background(), lookupFileIdFn, entry.Chunks, 0, int64(fileSize))
+	if err != nil {
+		return 0, err
+	}
 	chunkViews := filer.ViewFromVisibleIntervals(visibleIntervals, 0, int64(fileSize))
 
 	for x := chunkViews.Front(); x != nil; x = x.Next {
@@ -4456,23 +4460,22 @@ func (e *SQLEngine) getTopicTotalRowCount(ctx context.Context, namespace, topicN
 	// For each partition, count both parquet and live log rows
 	for _, partition := range partitions {
 		// Count parquet rows
-		parquetStats, parquetErr := hybridScanner.ReadParquetStatistics(partition)
-		if parquetErr == nil {
-			for _, stats := range parquetStats {
-				totalRowCount += stats.RowCount
-			}
+		parquetStats, err := hybridScanner.ReadParquetStatistics(partition)
+		if err != nil {
+			return 0, fmt.Errorf("read parquet statistics for %s: %w", partition, err)
+		}
+		for _, stats := range parquetStats {
+			totalRowCount += stats.RowCount
 		}
 
 		// Count live log rows (with deduplication)
-		parquetSourceFiles := make(map[string]bool)
-		if parquetErr == nil {
-			parquetSourceFiles = e.extractParquetSourceFiles(parquetStats)
-		}
+		parquetSourceFiles := e.extractParquetSourceFiles(parquetStats)
 
-		liveLogCount, liveLogErr := e.countLiveLogRowsExcludingParquetSources(ctx, partition, parquetSourceFiles)
-		if liveLogErr == nil {
-			totalRowCount += liveLogCount
+		liveLogCount, err := e.countLiveLogRowsExcludingParquetSources(ctx, partition, parquetSourceFiles)
+		if err != nil {
+			return 0, fmt.Errorf("count live log rows for %s: %w", partition, err)
 		}
+		totalRowCount += liveLogCount
 	}
 
 	return totalRowCount, nil
@@ -4509,17 +4512,18 @@ func (e *SQLEngine) getActualRowsScannedForFastPath(ctx context.Context, namespa
 	// (parquet files use metadata/statistics, so they contribute 0 to scan count)
 	for _, partition := range partitions {
 		// Get parquet files to determine what was converted
-		parquetStats, parquetErr := hybridScanner.ReadParquetStatistics(partition)
-		parquetSourceFiles := make(map[string]bool)
-		if parquetErr == nil {
-			parquetSourceFiles = e.extractParquetSourceFiles(parquetStats)
+		parquetStats, err := hybridScanner.ReadParquetStatistics(partition)
+		if err != nil {
+			return 0, fmt.Errorf("read parquet statistics for %s: %w", partition, err)
 		}
+		parquetSourceFiles := e.extractParquetSourceFiles(parquetStats)
 
 		// Count only live log rows that haven't been converted to parquet
-		liveLogCount, liveLogErr := e.countLiveLogRowsExcludingParquetSources(ctx, partition, parquetSourceFiles)
-		if liveLogErr == nil {
-			totalScannedRows += liveLogCount
+		liveLogCount, err := e.countLiveLogRowsExcludingParquetSources(ctx, partition, parquetSourceFiles)
+		if err != nil {
+			return 0, fmt.Errorf("count live log rows for %s: %w", partition, err)
 		}
+		totalScannedRows += liveLogCount
 
 		// Note: Parquet files contribute 0 to scan count since we use their metadata/statistics
 	}