MongoDB - datetime type for mongosqld

Question

I have a collection in MongoDB that have a Date field:

date: 2021-02-17T18:40:01.000+00:00

I want to expose this collection to a BI tool thanks to MongoDB BI Connector, mongosqld . I used mongodrdl to create the data model.

mongodrdl converts MongoDB's Date type to MySQL's timestamp type. When i read the date column in a BI application, the time is only zeros:

17/02/2021 00:00:00

This is catastrophic because i need the time. I tried to edit the drdl generated by mongodrdl and put the SqlType to datetime . But when i restart mongosqld i get the following error:

unable to create column "date" from drdl: unsupported SQL type: "datetime" on column "date"

How can i preserve the time for this date field to be properly exposed to BI tools?

Answer 1

date: 2021-02-17T18:40:01.000+00:00

This is a stringified (iso8601) representation of a timestamp. If this is how your timestamps are stored , they are of the wrong type (string, not timestamp) and hence produce zeroed SQL timestamps.

To fix, store the timestamps as timestamps (BSON date type).