Function AppendToMaybeNullArray

pkg/sql/sem/tree/eval.go:277–290

AppendToMaybeNullArray appends an element to an array. If the first argument is NULL, an array of one element is created.

(typ *types.T, left Datum, right Datum)

// AppendToMaybeNullArray appends an element to an array. If the first
// argument is NULL, an array of one element is created.
func AppendToMaybeNullArray(typ *types.T, left Datum, right Datum) (Datum, error) {
	result := NewDArray(typ)
	if left != DNull {
		for _, e := range MustBeDArray(left).Array {
			if err := result.Append(e); err != nil {
				return nil, err
			}
		}
	}
	if err := result.Append(right); err != nil {
		return nil, err
	}
	return result, nil
}

// PrependToMaybeNullArray prepends an element in the front of an arrray.
// If the argument is NULL, an array of one element is created.