Hi Kaigai-san, > -----Original Message----- > From: Kohei KaiGai [mailto:kai...@kaigai.gr.jp] > Sent: Monday, June 25, 2012 9:49 PM > To: Etsuro Fujita > Cc: Robert Haas; pgsql-hackers@postgresql.org > Subject: Re: [HACKERS] WIP Patch: Selective binary conversion of CSV file > foreign tables > > Fujita-san, > > The revised patch is almost good for me. > Only point I noticed is the check for redundant or duplicated options I pointed > out on the previous post. > So, if you agree with the attached patch, I'd like to hand over this patch for > committers.
OK I agree with you. Thanks for the revision!
Besides the revision, I modified check_selective_binary_conversion() to run
heap_close() in the whole-row-reference case. Attached is an updated version of
the patch.
Thanks.
Best regards,
Etsuro Fujita
> All I changed is:
> --- a/src/backend/commands/copy.c
> +++ b/src/backend/commands/copy.c
> @@ -122,6 +122,11 @@ typedef struct CopyStateData @@ -217,7 +221,7 @@ index
> 98bcb2f..0143d81 100644
> }
> + else if (strcmp(defel->defname, "convert_binary") == 0)
> + {
> -+ if (cstate->convert_binary)
> ++ if (cstate->convert_selectively)
> + ereport(ERROR,
> + (errcode(ERRCODE_SYNTAX_ERROR),
> + errmsg("conflicting or redundant options")));
>
> Thanks,
>
> 2012/6/20 Etsuro Fujita <fujita.ets...@lab.ntt.co.jp>:
> > Hi KaiGai-san,
> >
> > Thank you for the review.
> >
> >> -----Original Message-----
> >> From: pgsql-hackers-ow...@postgresql.org
> >> [mailto:pgsql-hackers-ow...@postgresql.org] On Behalf Of Kohei KaiGai
> >> Sent: Wednesday, June 20, 2012 1:26 AM
> >> To: Etsuro Fujita
> >> Cc: Robert Haas; pgsql-hackers@postgresql.org
> >> Subject: Re: [HACKERS] WIP Patch: Selective binary conversion of CSV
> >> file foreign tables
> >>
> >> Hi Fujita-san,
> >>
> >> Could you rebase this patch towards the latest tree?
> >> It was unavailable to apply the patch cleanly.
> >
> > Sorry, I updated the patch. Please find attached an updated version
> > of the patch.
> >
> >> I looked over the patch, then noticed a few points.
> >>
> >> At ProcessCopyOptions(), defel->arg can be NIL, isn't it?
> >> If so, cstate->convert_binary is not a suitable flag to check
> >> redundant option. It seems to me cstate->convert_selectively is more
> >> suitable flag to check it.
> >>
> >> + else if (strcmp(defel->defname, "convert_binary") == 0)
> >> + {
> >> + if (cstate->convert_binary)
> >> + ereport(ERROR,
> >> + (errcode(ERRCODE_SYNTAX_ERROR),
> >> + errmsg("conflicting or redundant
> >> + options")));
> >> + cstate->convert_selectively = true;
> >> + if (defel->arg == NULL || IsA(defel->arg, List))
> >> + cstate->convert_binary = (List *) defel->arg;
> >> + else
> >> + ereport(ERROR,
> >> + (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
> >> + errmsg("argument to option \"%s\" must be a
> >> list of column names",
> >> + defel->defname)));
> >> + }
> >
> > Yes, defel->arg can be NIL. defel->arg is a List structure listing
> > all the columns needed to be converted to binary representation, which
> > is NIL for the case where no columns are needed to be converted. For
> > example,
> > defel->arg is NIL for SELECT COUNT(*). In this case, while
> > cstate->convert_selectively is set to true, no columns are converted
> > cstate->at
> > NextCopyFrom(). Most efficient case! In short,
> > cstate->convert_selectively represents whether to do selective binary
> > conversion at NextCopyFrom(), and
> > cstate->convert_binary represents all the columns to be converted at
> > NextCopyFrom(), that can be NIL.
> >
> >> At NextCopyFrom(), this routine computes default values if configured.
> >> In case when these values are not referenced, it might be possible to
> >> skip unnecessary calculations.
> >> Is it unavailable to add logic to avoid to construct cstate->defmap
> >> on unreferenced columns at BeginCopyFrom()?
> >
> > I think that we don't need to add the above logic because file_fdw
> > does
> > BeginCopyFrom() with attnamelist = NIL, in which case, BeginCopyFrom()
> > doesn't construct cstate->defmap at all.
> >
> > I fixed a bug plus some minor optimization in
> > check_binary_conversion() that is renamed to
> > check_selective_binary_conversion() in the updated version, and now
> > file_fdw gives up selective binary conversion for the following
> > cases:
> >
> > a) BINARY format
> > b) CSV/TEXT format and whole row reference
> > c) CSV/TEXT format and all the user attributes needed
> >
> >
> > Best regards,
> > Etsuro Fujita
> >
> >> Thanks,
> >>
> >> 2012/5/11 Etsuro Fujita <fujita.ets...@lab.ntt.co.jp>:
> >> >> -----Original Message-----
> >> >> From: Robert Haas [mailto:robertmh...@gmail.com]
> >> >> Sent: Friday, May 11, 2012 1:36 AM
> >> >> To: Etsuro Fujita
> >> >> Cc: pgsql-hackers@postgresql.org
> >> >> Subject: Re: [HACKERS] WIP Patch: Selective binary conversion of
> >> >> CSV file foreign tables
> >> >>
> >> >> On Tue, May 8, 2012 at 7:26 AM, Etsuro Fujita
> >> > <fujita.ets...@lab.ntt.co.jp>
> >> >> wrote:
> >> >> > I would like to propose to improve parsing efficiency of
> >> >> > contrib/file_fdw by selective parsing proposed by Alagiannis et
> >> >> > al.[1], which means that for a CSV/TEXT file foreign table,
> >> >> > file_fdw performs binary conversion only for the columns needed
> >> >> > for query processing. Attached is a WIP patch implementing the
feature.
> >> >>
> >> >> Can you add this to the next CommitFest? Looks interesting.
> >> >
> >> > Done.
> >> >
> >> > Best regards,
> >> > Etsuro Fujita
> >> >
> >> >> --
> >> >> Robert Haas
> >> >> EnterpriseDB: http://www.enterprisedb.com The Enterprise
> >> >> PostgreSQL Company
> >> >>
> >> >
> >> >
> >> >
> >> > --
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> >> > To make changes to your subscription:
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> >>
> >>
> >>
> >> --
> >> KaiGai Kohei <kai...@kaigai.gr.jp>
> >>
> >> --
> >> Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To
> >> make changes to your subscription:
> >> http://www.postgresql.org/mailpref/pgsql-hackers
> >>
> >
> >
> >
> >
>
>
>
> --
> KaiGai Kohei <kai...@kaigai.gr.jp>
file_fdw_sel_bin_conv_v4.patch
Description: Binary data
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