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From: Tom Lane <[email protected]>
To: Michael Paquier <[email protected]>
Cc: Sami Imseih <[email protected]>
Cc: Christoph Berg <[email protected]>
Cc: Lukas Fittl <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Cc: ma lz <[email protected]>
Subject: Re: query_id: jumble names of temp tables for better pg_stat_statement UX
Date: Tue, 25 Mar 2025 19:24:20 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
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Michael Paquier <[email protected]> writes:
> [ v6-0001-Add-custom-query-jumble-function-for-RangeTblEntr.patch ]

Couple of minor review comments ...

* In 5ac462e2b, this bit:

        # node type
-       if (($t =~ /^(\w+)\*$/ or $t =~ /^struct\s+(\w+)\*$/)
+       if ($query_jumble_custom)
+       {
+           # Custom function that applies to one field of a node.
+           print $jff "\tJUMBLE_CUSTOM($n, $f);\n";
+       }
+       elsif (($t =~ /^(\w+)\*$/ or $t =~ /^struct\s+(\w+)\*$/)

fails to honor $query_jumble_ignore as the other if-branches do.
Perhaps it's unlikely that a node would have both query_jumble_custom
and query_jumble_ignore annotations, but still, the script would emit
completely incorrect code if it did.  Also, the "# node type" comment
should probably be moved down to within the first "elsif" block.

* In the v6 patch, this doesn't read very smoothly:

+     * Expanded reference names.  This uses a custom query jumble function so
+     * as the table name is included in the computation, not its list of
+     * columns.

Perhaps better

+     * Expanded reference names.  This uses a custom query jumble function so
+     * that the table name is included in the computation, but not its list of
+     * columns.

* Also, here:

+   considered the same. However, if the alias for a table is different
+   for semantically similar queries, these queries will be considered
+   distinct.

I'd change "semantically similar queries" to "otherwise-similar
queries"; I think writing "semantically" will just confuse people.

Otherwise LGTM.

			regards, tom lane

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