presto-jdbc/src/main/java/io/prestosql/jdbc/PrestoResultSet.java/PrestoResultSet/getArray
class PrestoResultSet:    @Override
    public Array getArray(int columnIndex)
            throws SQLException
    {
        Object value = column(columnIndex);
        if (value == null) {
            return null;
        }

        ColumnInfo columnInfo = columnInfo(columnIndex);
        String elementTypeName = getOnlyElement(columnInfo.getColumnTypeSignature().getArguments()).toString();
        int elementType = getOnlyElement(columnInfo.getColumnParameterTypes());
        return new PrestoArray(elementTypeName, elementType, (List<?>) value);
    }