From: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
---|---|
To: | Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> |
Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Amit Langote <amitlangote09(at)gmail(dot)com>, Rajkumar Raghuwanshi <rajkumar(dot)raghuwanshi(at)enterprisedb(dot)com>, Ashutosh Bapat <ashutosh(dot)bapat(at)enterprisedb(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Declarative partitioning - another take |
Date: | 2016-10-26 02:41:02 |
Message-ID: | CAA4eK1LQLCAMmxQL6deFEm_0x1KRzM22zEg=sbpR6L2B2fxZqg@mail.gmail.com |
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On Wed, Oct 26, 2016 at 6:36 AM, Amit Langote
<Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> wrote:
>> 1.
>> @@ -1775,6 +1775,12 @@ BeginCopyTo(ParseState *pstate,
>> {
>> ..
>> + else if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
>> + ereport(ERROR,
>> + (errcode(ERRCODE_WRONG_OBJECT_TYPE),
>> + errmsg("cannot copy from partitioned table \"%s\"",
>> + RelationGetRelationName(rel)),
>> + errhint("Try the COPY (SELECT ...) TO variant.")));
>> ..
>> }
>>
>> Why is this restriction? Won't it be useful to allow it for the cases
>> when user wants to copy the data of all the partitions?
>
> Sure, CopyTo() can be be taught to scan leaf partitions when a partitioned
> table is specified, but I thought this may be fine initially.
>
Okay, I don't want to add anything to your existing work unless it is
important. However, I think there should be some agreement on which
of the restrictions are okay for first version of patch. This can
avoid such questions in future from other reviewers.
>> 2.
>> + if (!pg_strcasecmp(stmt->partspec->strategy, "list") &&
>> + partnatts > 1)
>> + ereport(ERROR,
>> + (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
>> + errmsg("cannot list partition using more than one column")));
>>
>> /cannot list/cannot use list
>
> Actually "list partition" works here as a verb, as in "to list partition".
>
I am not an expert of this matter, so probably some one having better
grip can comment. Are we using something similar in any other error
message?
--
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com
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