|From:||Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>|
|To:||David Rowley <david(dot)rowley(at)2ndquadrant(dot)com>|
|Cc:||Rajkumar Raghuwanshi <rajkumar(dot)raghuwanshi(at)enterprisedb(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, Jesper Pedersen <jesper(dot)pedersen(at)redhat(dot)com>, Amit Langote <amitlangote09(at)gmail(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Beena Emerson <memissemerson(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>|
|Subject:||Re: [HACKERS] path toward faster partition pruning|
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Thanks for the review.
On 2018/02/21 19:15, David Rowley wrote:
> Thanks for fixing. I made a pass over v31 and only see a few small things:
> 1. In get_partitions_for_keys() why is the
> get_partitions_excluded_by_ne_datums call not part of
Hmm, there is a question of where exactly to put the call within
get_partitions_for_keys_list(). At the end would sound like an obvious
answer, but we tend to short-circuit return from that function at various
points, which it seems undesirable to change. So, I left things as is here.
> 2. Still a stray "minoff += 1;" in get_partitions_for_keys_range
I actually found a few and changed them to ++ or --, as applicable.
> 3. You're also preferring to minoff--/++, but maxoff -= 1/maxoff += 1;
> would be nice to see the style unified here.
Fixed all as mentioned above.
> 4. "other other"
> * that is, each of its fields other other than clauseinfo must be valid before
> 5. "a IS NULL" -> "an IS NULL":
> * Based on a IS NULL or IS NOT NULL clause that was matched to a partition
> 6. Can you add a warning in the header comment for
> extract_partition_clauses() to explain "Note: the 'clauses' List may
> be modified inside this function. Callers may like to make a copy of
> important lists before passing them to this function.", or something
> like that...
At least in my patch, extract_partition_clauses() is a local function with
just one caller, but I still don't see any problem with warning the
reader. So, done.
> 7. "null" -> "nulls"
> * Only allow strict operators. This will guarantee null are
> 8. "dicard" -> "discard"
> * contains a <= 2, then because 3 <= 2 is false, we dicard a < 3 as
Please find attached updated patches.
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