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https://issues.apache.org/jira/browse/DRILL-5033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17652985#comment-17652985
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ASF GitHub Bot commented on DRILL-5033:
---------------------------------------
cgivre commented on PR #2731:
URL: https://github.com/apache/drill/pull/2731#issuecomment-1367677557
@unical1988
You actually don't have to modify the code to get this data to read
properly. As I mentioned on the user group, the easiest way would probably be
to provide a schema. The good news is that you can do this at query time.
Take a look here:
https://drill.apache.org/docs/plugin-configuration-basics/#specifying-the-schema-as-table-function-parameter
An example query might be:
```sql
select * from table(dfs.tmp.`file.json`(
schema => 'inline=(col0 varchar, col1 date properties {`drill.format` =
`yyyy-MM-dd`})
properties {`drill.strict` = `false`}'))
```
> Query on JSON that has null as value for each key
> -------------------------------------------------
>
> Key: DRILL-5033
> URL: https://issues.apache.org/jira/browse/DRILL-5033
> Project: Apache Drill
> Issue Type: Bug
> Components: Storage - JSON
> Affects Versions: 1.9.0
> Reporter: Khurram Faraaz
> Priority: Major
>
> Drill 1.9.0 git commit ID : 83513daf
> Drill returns same result with or without `store.json.all_text_mode`=true
> Note that each key in the JSON has null as its value.
> [root@cent01 null_eq_joins]# cat right_all_nulls.json
> {
> "intKey" : null,
> "bgintKey": null,
> "strKey": null,
> "boolKey": null,
> "fltKey": null,
> "dblKey": null,
> "timKey": null,
> "dtKey": null,
> "tmstmpKey": null,
> "intrvldyKey": null,
> "intrvlyrKey": null
> }
> [root@cent01 null_eq_joins]#
> Querying the above JSON file results in null as query result.
> - We should see each of the keys in the JSON as a column in query result.
> - And in each column the value should be a null value.
> Current behavior does not look right.
> {noformat}
> 0: jdbc:drill:schema=dfs.tmp> select * from `right_all_nulls.json`;
> +-------+
> | * |
> +-------+
> | null |
> +-------+
> 1 row selected (0.313 seconds)
> {noformat}
> Adding comment from [~julianhyde]
> IMHO it is similar but not the same as DRILL-1256. Worth logging an issue and
> let [~jnadeau] (or someone) put on the record what should be the behavior of
> an empty record (empty JSON map) when it is top-level (as in this case) or in
> a collection.
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