Re: Add SPLIT PARTITION/MERGE PARTITIONS commands - Mailing list pgsql-hackers

From Alexander Korotkov
Subject Re: Add SPLIT PARTITION/MERGE PARTITIONS commands
Date
Msg-id CAPpHfdshkf0C2h09S00TVB8h3x8UT+GZyQ6LK2WGg1hOjnNE4g@mail.gmail.com
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In response to Re: Add SPLIT PARTITION/MERGE PARTITIONS commands  (Dmitry Koval <d.koval@postgrespro.ru>)
List pgsql-hackers
Hi Dmitry.

On Mon, Sep 1, 2025 at 2:04 PM Dmitry Koval <d.koval@postgrespro.ru> wrote:
> Hi!
> Thank you for the notes and patch!

Some additional notes from me.

1) src/backend/parser/parse_utilcmd.c includes are not alphabetically ordered here
+#include "partitioning/partdesc.h"
+#include "partitioning/partbounds.h"

2) There is unicode dash in the comment of ATExecMergePartitions() here.  I suggest we should stick to ascii.

+   /*
+    * Check ownership of merged partitions — partitions with different
+    * owners cannot be merged. Also, collect the OIDs of these partitions
+    * during the check.
+    */

3) Regarding 17bcf4f545, I see btnamecmp() is collation-aware.  Should we also specify COLLATE "C" every time we do "ORDER BY relname"?

4) This comment sounds misleading.  Probably it should say "are contained".

+/*
+ * check_parent_values_in_new_partitions
+ *
+ * (function for BY LIST partitioning)
+ *
+ * Checks that all values of split partition (with Oid partOid) contains in new
+ * partitions.
+ *

5) Given what latter items say, I think the 1. should say "The DEFAULT partition must be at most one."

/*
 * check_partitions_for_split
 *
 * Checks new partitions for SPLIT PARTITIONS command:
 * 1. DEFAULT partition should be one.

6) Regarding the isolation tests.  I see we are exercising INSERTs and intra-partition UPDATEs.  Should we also try some cross-partition UPDATEs?

------
Regards,
Alexander Korotkov
Supabase

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