Обсуждение: UPDATE ... SET
Modify rewriteTargetList() to deal with a SetToDefault node InsertDefault renamed. Teach updateTargetListEntry() to use the columns type rather than calling exprType for it, since SetToDefault does not have a type but is stored in (TargetEntry *)->expr Remove special case in insert code. Let the default request flow through the same as the update case. On Thu, 2003-06-05 at 16:45, Tom Lane wrote: > Rod Taylor <rbt@rbt.ca> writes: > > It would seem a new primnode (change InsertDef into SetDefault or > > similar) will be required with some executor logic. > > It is not the executor's business to know about defaults. The rewriter > is the place where defaults get inserted - see rewriteTargetList(). > > Note that default NULL will have to be treated a little differently from > what we do for INSERT, since the, um, default behavior of UPDATE is to > preserve columns rather than replace 'em with nulls. > > regards, tom lane -- Rod Taylor <rbt@rbt.ca> PGP Key: http://www.rbt.ca/rbtpub.asc
Вложения
Your patch has been added to the PostgreSQL unapplied patches list at:
http://momjian.postgresql.org/cgi-bin/pgpatches
I will try to apply it within the next 48 hours.
---------------------------------------------------------------------------
Rod Taylor wrote:
-- Start of PGP signed section.
> Modify rewriteTargetList() to deal with a SetToDefault node
> InsertDefault renamed.
>
> Teach updateTargetListEntry() to use the columns type rather than
> calling exprType for it, since SetToDefault does not have a type but is
> stored in (TargetEntry *)->expr
>
> Remove special case in insert code. Let the default request flow
> through the same as the update case.
>
>
> On Thu, 2003-06-05 at 16:45, Tom Lane wrote:
> > Rod Taylor <rbt@rbt.ca> writes:
> > > It would seem a new primnode (change InsertDef into SetDefault or
> > > similar) will be required with some executor logic.
> >
> > It is not the executor's business to know about defaults. The rewriter
> > is the place where defaults get inserted - see rewriteTargetList().
> >
> > Note that default NULL will have to be treated a little differently from
> > what we do for INSERT, since the, um, default behavior of UPDATE is to
> > preserve columns rather than replace 'em with nulls.
> >
> > regards, tom lane
>
> --
> Rod Taylor <rbt@rbt.ca>
>
> PGP Key: http://www.rbt.ca/rbtpub.asc
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--
Bruce Momjian | http://candle.pha.pa.us
pgman@candle.pha.pa.us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073
Patch applied. Thanks. --------------------------------------------------------------------------- Rod Taylor wrote: -- Start of PGP signed section. > Modify rewriteTargetList() to deal with a SetToDefault node > InsertDefault renamed. > > Teach updateTargetListEntry() to use the columns type rather than > calling exprType for it, since SetToDefault does not have a type but is > stored in (TargetEntry *)->expr > > Remove special case in insert code. Let the default request flow > through the same as the update case. > > > On Thu, 2003-06-05 at 16:45, Tom Lane wrote: > > Rod Taylor <rbt@rbt.ca> writes: > > > It would seem a new primnode (change InsertDef into SetDefault or > > > similar) will be required with some executor logic. > > > > It is not the executor's business to know about defaults. The rewriter > > is the place where defaults get inserted - see rewriteTargetList(). > > > > Note that default NULL will have to be treated a little differently from > > what we do for INSERT, since the, um, default behavior of UPDATE is to > > preserve columns rather than replace 'em with nulls. > > > > regards, tom lane > > -- > Rod Taylor <rbt@rbt.ca> > > PGP Key: http://www.rbt.ca/rbtpub.asc [ Attachment, skipping... ] -- End of PGP section, PGP failed! -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073