Column type modifications in clickhouse can take a long time, since clickhouse has to migrate all data to the new type. Let's say a jdbc client initiates a column type update, and then the jvm process is killed. What happens to the update task? Please link to official sources if possible.
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If you are using a mutation the process is asynchronous and will continue in the background - assume it has been scheduled once the server responds. Use the system.mutations table to monitor progress of the execution.
You can kill the operation using KILL MUTATION
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