@Override
    public Instant getTimestampInstant(final int columnIndex) {
        if (isNull(columnIndex)) {
            return null;
        }
        int offset = getOffset(columnIndex);
        long sec = pageSlice.getLong(offset);
        int nsec = pageSlice.getInt(offset + 8);
        return Instant.ofEpochSecond(sec, nsec);
    }
Returns a Timestamp value.

@deprecated Use {@link #getTimestampInstant(int)} instead.
embulk-core/src/main/java/org/embulk/spi/PageReaderImpl.java