How to create empty table

Apache Druid Q&A Operations
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#1

we need to create an empty table in druid datasource. Is there any way to create that table. Also how to add dimension which having null/empty values initially.

Use case :
we are creating default dashboard and segments when deploying the apps (in which Druid used a query engine) that why we required table/s should be present else these will giving error while rollout apps.

Moreover, we give reset functionality to the user so that one can reset data after some initial experiments.

Thanks.

#2

How is the data ingested when it is? I’m guessing batch ingestion? Do users overwrite with new data each time, or add to it (appendToExisting: true)? If they overwrite, your best bet might be to have a job that ingests a dummy row with data that’s clearly a placeholder, then overwrite with real data later. I don’t know that you can have an empty table, unless maybe it’s a realtime ingestion. (Glad to be corrected if you can.)

#3

Thanks, Ben its a good suggestion.