jackc/pgx · error

uint4

Error message

uint4: %w

What it means

scanPlanBinaryInt4ToUint8 wraps pgio.Uint32Exact: the binary int4 payload was not exactly 4 bytes, so it cannot be decoded (note the 'uint4' prefix is the plan's label for the int4 source).

Solutions

1. Treat as protocol/data corruption — verify the column is int
2. Check for driver/server version mismatch

When it happens

Trigger: Thrown at pgtype/int.go:911 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of jackc/pgx@ec1a0befd2 (2026-08-04). Data as JSON: /api/errors/f1b7c804ffaec0ad. Report an issue: GitHub.

Appendix: source

Thrown at pgtype/int.go:911

	} else if n > math.MaxInt8 {
		return fmt.Errorf("%d is greater than maximum value for int8", n)
	}

	*p = int8(n)

	return nil
}

type scanPlanBinaryInt4ToUint8 struct{}

func (scanPlanBinaryInt4ToUint8) Scan(src []byte, dst any) error {
	if src == nil {
		return fmt.Errorf("cannot scan NULL into %T", dst)
	}

	raw, err := pgio.Uint32Exact(src)
	if err != nil {
		return fmt.Errorf("uint4: %w", err)
	}

	p, ok := (dst).(*uint8)
	if !ok {
		return ErrScanTargetTypeChanged
	}

	n := int32(raw)
	if n < 0 {
		return fmt.Errorf("%d is less than minimum value for uint8", n)
	}

	if n > math.MaxUint8 {
		return fmt.Errorf("%d is greater than maximum value for uint8", n)
	}

	*p = uint8(n)

View on GitHub (pinned to ec1a0befd2)