jackc/pgx · error

cannot losslessly convert %v to int64

Error message

cannot losslessly convert %v to int64

What it means

Error "cannot losslessly convert %v to int64" thrown in jackc/pgx.

Source

Thrown at pgtype/float8.go:296

type scanPlanBinaryFloat8ToInt64Scanner struct{}

func (scanPlanBinaryFloat8ToInt64Scanner) Scan(src []byte, dst any) error {
	s := (dst).(Int64Scanner)

	if src == nil {
		return s.ScanInt64(Int8{})
	}

	raw, err := pgio.Uint64Exact(src)
	if err != nil {
		return fmt.Errorf("float8: %w", err)
	}

	ui64 := int64(raw)
	f64 := math.Float64frombits(uint64(ui64))
	i64 := int64(f64)
	if f64 != float64(i64) {
		return fmt.Errorf("cannot losslessly convert %v to int64", f64)
	}

	return s.ScanInt64(Int8{Int64: i64, Valid: true})
}

type scanPlanBinaryFloat8ToTextScanner struct{}

func (scanPlanBinaryFloat8ToTextScanner) Scan(src []byte, dst any) error {
	s := (dst).(TextScanner)

	if src == nil {
		return s.ScanText(Text{})
	}

	raw, err := pgio.Uint64Exact(src)
	if err != nil {
		return fmt.Errorf("float8: %w", err)
	}

View on GitHub (pinned to ec1a0befd2)

When it happens

Trigger: Thrown at pgtype/float8.go:296 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: /data/errors/43d0a8a282a0cfdc.json. Report an issue: GitHub.