What to do in such error: DML operation failed, message = error code = INTERNAL, message = Exception in RPC

TQL [database=bi_ceg]> delete from db_name.schema_name.table_name where datamonth = 201907;
DML operation failed,  message = error code = INTERNAL, message = Exception in RPC
Statement=delete from db_name.schema_name.table_name where datamonth = 201907;
 returned error.

In tql and just hangs in jdbc

Having such issue. 

Retried many times with the same result

What to do? Where to look logs?

So i guess can just drop table, but do not want to do it. Table is used now by users.

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