Github user lw-lin commented on the issue:
https://github.com/apache/spark/pull/14118
I think @HyukjinKwon has made a good point: it's kind of strange null
strings can be written out, but can not be read back as nulls.
So for `StringType`:
<table>
<tr>
<td align="center"></td>
<td align="center">nulls write & read</td>
<td align="center">consistent with 1.6?</td>
</tr>
<tr>
<td align="center">option (a)</td>
<td align="center">null strings can be written out,<br/>but can
<strong>NOT</strong> be read back as nulls</td>
<td align="center">yes</td>
</tr>
<tr>
<td align="center">option (b)</td>
<td align="center">null strings can be written out,<br/> and can be
read back as nulls</td>
<td align="center"><strong>NO</strong></td>
</tr>
</table>
@HyukjinKwon and I are somewhat inclined to option(b) because it sounds
reasonable to end users. @rxin would you make a final decision? Thanks!
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