Horton

Re: ExecRTCheckPerms() and many prunable partitions

Alvaro Herrera <alvherre@alvh.no-ip.org>

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From: Alvaro Herrera <alvherre@alvh.no-ip.org>
To: Amit Langote <amitlangote09@gmail.com>
Cc: Ian Lawrence Barwick <barwick@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>, David Rowley <dgrowleyml@gmail.com>, Greg Stark <stark@mit.edu>, Julien Rouhaud <rjuju123@gmail.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2022-12-02T09:59:54Z
Lists: pgsql-hackers 
Hello,

On 2022-Dec-02, Amit Langote wrote:

> This sounds like a better idea than adding a new AttrMap, so done this
> way in the attached 0001.

Thanks for doing that!  I have pushed it, but I renamed
ri_RootToPartitionMap to ri_RootToChildMap and moved it to another spot
in ResultRelInfo, which allows to simplify the comments.

> I've also merged into 0002 the delta patch I had posted earlier to add
> a copy of RTEPermInfos into the flattened permInfos list instead of
> adding the Query's copy.

Great.  At this point I have no other comments, except that in both
parse_relation.c and rewriteManip.c you've chosen to add the new
functions at the bottom of each file, which is seldom a good choice.
I think in the case of CombineRangeTables it should be the very first
function in the file, before all the walker-type stuff; and for
Add/GetRTEPermissionInfo I would suggest that right below
addRangeTableEntryForENR might be a decent choice (need to fix the .h
files to match, of course.)

-- 
Álvaro Herrera        Breisgau, Deutschland  —  https://www.EnterpriseDB.com/
"World domination is proceeding according to plan"        (Andrew Morton)

Commits

  1. Add a test case for a316a3bc

  2. Correctly set userid of subquery relations' child rels

  3. Fix buggy recursion in flatten_rtes_walker().

  4. Remove some dead code in selfuncs.c

  5. Update outdated comment in ApplyRetrieveRule

  6. Rework query relation permission checking

  7. Generalize ri_RootToPartitionMap to use for non-partition children

  8. Stop accessing checkAsUser via RTE in some cases

  9. Add 'missing_ok' argument to build_attrmap_by_name