-> Columnstore tables typically do not push data into a compressed columnstore segment until there are more than 1 million rows per table. If a CCI table has many open rowgroups with a total number of rows that do not meet the threshold for compression (1 million rows), these rowgroups will remain open and be stored as row data. Consequently, this will increase the distribution database size as they are not compressed. Moreover, these open rowgroups will not benefit from the CCI and will require more resources to maintain. It may be advisable to use the [ALTER INDEX REORGANIZE](https://learn.microsoft.com/sql/t-sql/statements/alter-index-transact-sql?view=sql-server-ver16#reorganize-a-columnstore-index).
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