-- select all columnstore indexes
SELECT 
  OBJECT_SCHEMA_NAME(OBJECT_ID) SchemaName,
  OBJECT_NAME(OBJECT_ID) TableName,
  i.name AS IndexName, 
  i.type_desc IndexType
FROM sys.indexes AS i 
WHERE is_hypothetical = 0 
  AND i.index_id <> 0 
  AND i.type_desc IN ('CLUSTERED COLUMNSTORE','NONCLUSTERED COLUMNSTORE');
  
-- maintenance
ALTER INDEX [IndexName] ON [TableName] REORGANIZE WITH (COMPRESS_ALL_ROW_GROUPS = ON);  
ALTER INDEX [IndexName] ON [TableName] REBUILD PARTITION = ALL WITH (DATA_COMPRESSION = COLUMNSTORE_ARCHIVE, MAXDOP = 1);

-- get row group physical stats
SELECT *   
FROM sys.dm_db_column_store_row_group_physical_stats   
WHERE object_id  = object_id('TableName')  
ORDER BY row_group_id;  

-- get some stats around CIX - helps to see which partitions need to be rebuilt
SELECT object_name(object_id)
	,partition_number
	,FORMAT(sum(row_group_id), 'N0') AS row_group_count
	,FORMAT(sum(total_rows), 'N0') AS row_count
	,FORMAT(sum(size_in_bytes), 'N0') AS size_in_bytes
	,FORMAT(sum(size_in_bytes) / sum(total_rows), 'N0') AS size_per_row
FROM sys.dm_db_column_store_row_group_physical_stats
WHERE object_name(object_id) LIKE ' table name %'
GROUP BY object_name(object_id)
	,partition_number
ORDER BY partition_number;