Hi,
While working on CIC for partitioned tables [1], I noticed that REINDEX for partitioned tables is not tracking keeping progress of partitioned tables, so I'm creating a separate thread for this fix as suggested.
The way REINDEX for partitioned tables works now ReindexMultipleInternal treats every partition as an independent table without keeping track of partition_done/total counts, because this is just generic code for processing multiple tables. The patch addresses that by passing down the knowledge a flag to distinguish partitions from independent tables in ReindexMultipleInternal and its callees. I also noticed that the partitioned CREATE INDEX progress tracking could also benefit from progress_index_partition_done function that zeroizes params in addition to incrementing the counter, so I applied it there as well.
[1] https://www.postgresql.org/message-id/55cfae76-2ffa-43ed-a7e7-901bffbebee4%40gmail.com