jackc/pgx · error

cannot scan %T

Error message

cannot scan %T

What it means

Error "cannot scan %T" thrown in jackc/pgx.

Source

Thrown at pgtype/polygon.go:48

}

// PolygonValue implements the [PolygonValuer] interface.
func (p Polygon) PolygonValue() (Polygon, error) {
	return p, nil
}

// Scan implements the [database/sql.Scanner] interface.
func (p *Polygon) Scan(src any) error {
	if src == nil {
		*p = Polygon{}
		return nil
	}

	if src, ok := src.(string); ok {
		return scanPlanTextAnyToPolygonScanner{}.Scan([]byte(src), p)
	}

	return fmt.Errorf("cannot scan %T", src)
}

// Value implements the [database/sql/driver.Valuer] interface.
func (p Polygon) Value() (driver.Value, error) {
	if !p.Valid {
		return nil, nil
	}

	buf, err := PolygonCodec{}.PlanEncode(nil, 0, TextFormatCode, p).Encode(p, nil)
	if err != nil {
		return nil, err
	}

	return string(buf), err
}

type PolygonCodec struct{}

View on GitHub (pinned to ec1a0befd2)

When it happens

Trigger: Thrown at pgtype/polygon.go:48 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/d4bf794ad8a57c88.json. Report an issue: GitHub.