What causes "failed to generate sequence SDL for %s.%s" in bytebase/bytebase?

Unwrap the error for the root cause

failed to generate sequence SDL for %s.%s

Error message

failed to generate sequence SDL for %s.%s

What it means

Owned sequences (those with OwnerTable and OwnerColumn set) are dumped as CREATE SEQUENCE via writeSequenceSDL. This error wraps the helper's error with schema and sequence name context and fails the database definition export. It is a pure context wrapper over the writer error.

Source

Thrown at backend/plugin/schema/pg/get_database_definition.go:4233

							return nil, errors.Wrapf(err, "failed to generate trigger comment for %s.%s.%s", schemaName, table.Name, trigger.Name)
						}
					}
				}
			}

			// Write owned sequences (non-serial/non-identity) for this table
			for _, sequence := range tableSequences {
				// Skip sequences that belong to serial or identity columns
				sequenceKey := schemaName + "." + sequence.Name
				if skipSequences[sequenceKey] {
					continue
				}

				// Only include sequences with owners (non-independent sequences)
				if sequence.OwnerTable != "" && sequence.OwnerColumn != "" {
					buf.WriteString("\n")
					if err := writeSequenceSDL(&buf, schemaName, sequence); err != nil {
						return nil, errors.Wrapf(err, "failed to generate sequence SDL for %s.%s", schemaName, sequence.Name)
					}
					buf.WriteString(";\n")

					// Add sequence comment if present
					if len(sequence.Comment) > 0 {
						buf.WriteString("\n")
						if err := writeSequenceCommentSDL(&buf, schemaName, sequence); err != nil {
							return nil, errors.Wrapf(err, "failed to generate sequence comment for %s.%s", schemaName, sequence.Name)
						}
					}

					// Add ALTER SEQUENCE OWNED BY. Skip when the owning table
					// has no columns; the OWNED BY clause would reference a
					// column absent from the dump.
					if !tableHasNoColumns(table) {
						buf.WriteString("\n")
						if err := writeAlterSequenceOwnedBy(&buf, schemaName, sequence); err != nil {
							return nil, errors.Wrapf(err, "failed to generate ALTER SEQUENCE OWNED BY for %s.%s", schemaName, sequence.Name)

View on GitHub (pinned to 1870550677)

Solutions

Unwrap the error for the root cause
Check that writeSequenceSDL's writer argument is a functioning strings.Builder
Retry if transient I/O was involved
Validate the sequence metadata (Name, OwnerTable, OwnerColumn) for anomalies
Escalate reproducible failures as bugs in backend/plugin/schema/pg

Defensive patterns

Strategy: try-catch

Validate before calling

for _, seq := range schema.Sequences {
	if seq.OwnerTable == "" || seq.OwnerColumn == "" { continue } // independent sequences handled elsewhere
}

Type guard

func isOwned(s *storepb.SequenceMetadata) bool { return s.OwnerTable != "" && s.OwnerColumn != "" }

Try / catch

if err := exportSDL(...); err != nil { return fmt.Errorf("sequence dump failed: %w", err) }

Prevention

Ensure sequence ownership metadata is populated by the metadata collector
Write sequences to in-memory buffers in tests
Unwrap to identify the failing writer call
Skip independent sequences explicitly rather than relying on the exporter

When it happens

Trigger: GetMultiFileDatabaseDefinition loops schema sequences; for each with sequence.OwnerTable != "" && sequence.OwnerColumn != "", writeSequenceSDL returns an error, wrapped as 'failed to generate sequence SDL for <schema>.<sequence>'.

Common situations: Dumping databases with identity/serial-backed sequences marked as owned; surfaces only when the buffer write fails unexpectedly.

Understand the failure class

Background: "This is a bug, please report it": internal invariant violations, unreachable panics, and SNH errors explained — this error's family across 47 libraries.

Related errors

AI-assisted analysis of bytebase/bytebase@1870550677 (2026-09-06). Data as JSON: /api/errors/060b09a6b10549c6. Report an issue: GitHub.