Hi,
Try something like
SELECT
CASE WHEN field1_old is not null THEN field1_old
ELSE field1_renamed as field1,
field2,
field3
FROM yourjsonfiles;
On 15 January 2018 at 04:09, Divya Gehlot <divya.htco...@gmail.com> wrote:
> Hi,
> I am processing json data files in Apache Drill.
>
> Earlier the format of files were
>
> {
> "field2": [
> "296dOmWrTK-dunFoei2gQg"
> ],
> "field3": {
> "name": "SE_21",
> "count": 0
> },
> "field1_old": "Qsa87PoaTgCIEab0z8VmgQ",
> "timestamp": 1514105922659
> }
>
> Later the files format changes to
>
> {
> "field1_renamed": "OiJ4FeiMEeexdAaIPcVKTA",
> "filed2": [
> "kwj5GD3EQYa1joxIWrPWEw"
> ],
> "filed3": {
> "name": "SE_16",
> "count": 0
> },
> "timestamp": 1515545336591
>
>
> The only change in the files data is field1_old and field1_renamed
> I know I can process the files in two queries and name field 1_old and
> field _renamed as field1
> I am looking for better ideas to process these files in one query .
>
> Thanks,
> Divya
>
