wuchong commented on a change in pull request #13972:
URL: https://github.com/apache/flink/pull/13972#discussion_r519653107
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File path: docs/dev/table/connectors/formats/json.md
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@@ -117,6 +117,26 @@ Format Options
</ul>
</td>
</tr>
+ <tr>
+ <td><h5>json.map-null-key.mode</h5></td>
+ <td>optional</td>
+ <td style="word-wrap: break-word;"><code>'FAIL'</code></td>
+ <td>String</td>
+ <td>Specify the handling mode when serializing null keys for map data.
Currently supported values are <code>'FAIL'</code>, <code>'DROP'</code> and
<code>'LITERAL'</code>:
+ <ul>
+ <li>Option <code>'FAIL'</code> will throw exception when encountering
map with null key.</li>
+ <li>Option <code>'DROP'</code> will drop null key entries for map
data.</li>
+ <li>Option <code>'LITERAL'</code> will replace null key with string
literal.</li>
+ </ul>
+ </td>
+ </tr>
+ <tr>
+ <td><h5>json.map-null-key.literal</h5></td>
+ <td>optional</td>
+ <td style="word-wrap: break-word;">'null'</td>
+ <td>String</td>
+ <td>Specify string literal to replace null key when
<code>'json.map-null-key.literal'</code> is LITERAL.</td>
Review comment:
json.map-null-key.mode
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