| Commit message (Collapse) | Author | Age |
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Previously, workers sent data to the leader using the client encoding.
That mostly worked, but the leader the converted the data back to the
server encoding. Since not all encoding conversions are reversible,
that could provoke failures. Fix by using the database encoding for
all communication between worker and leader.
Also, while temporary changes to GUC settings, as from the SET clause
of a function, are in general OK for parallel query, changing
client_encoding this way inside of a parallel worker is not OK.
Previously, that would have confused the leader; with these changes,
it would not confuse the leader, but it wouldn't do anything either.
So refuse such changes in parallel workers.
Also, the previous code naively assumed that when it received a
NotifyResonse from the worker, it could pass that directly back to the
user. But now that worker-to-leader communication always uses the
database encoding, that's clearly no longer correct - though,
actually, the old way was always broken for V2 clients. So
disassemble and reconstitute the message instead.
Issues reported by Peter Eisentraut. Patch by me, reviewed by
Peter Eisentraut.
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This looks like it would cause changes from subtransactions to be missed
by the iterator being constructed, if those changes had been spilled to
disk previously. This implies that large subtransactions might be lost
(in whole or in part) by logical replication. Found and fixed by
Petru-Florin Mihancea, per bug #14208.
Report: <20160622144830.5791.22512@wrigleys.postgresql.org>
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VS2013 apparently has a problem with taking the address of a formal
parameter in some cases. We do that elsewhere without trouble, but
in this case the address is being passed to a subroutine that will
probably get inlined, so maybe the combination of those things is
what tickles the bug. Anyway, introducing an extra copy of the
parameter value is enough to work around it. Per trouble report
from Umair Shahid.
Report: <CAM184AcjqKYZSdQqBHDrnENXHhW=mXbUC46QYPJ=nAh0gUHCGA@mail.gmail.com>
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In non-text output formats, parallelized aggregates were reporting
"Partial" or "Finalize" as a field named "Operation", which might be all
right in the absence of any context --- but other plan node types use that
field to report SQL-visible semantics, such as Select/Insert/Update/Delete.
So that naming choice didn't seem good to me. I changed it to "Partial
Mode".
Also, the field did not appear at all for a non-parallelized Agg plan node,
which is contrary to expectation in non-text formats. We're notionally
producing objects that conform to a schema, so the set of fields for a
given node type and EXPLAIN mode should be well-defined. I set it up to
fill in "Simple" in such cases.
Other fields that were added for parallel query, namely "Parallel Aware"
and Gather's "Single Copy", had not gotten the word on that point either.
Make them appear always in non-text output.
Also, the latter two fields were nominally producing boolean output, but
were getting it wrong, because bool values shouldn't be quoted in JSON or
YAML. Somehow we'd not needed an ExplainPropertyBool formatting subroutine
before 9.6; but now we do, so invent it.
Discussion: <16002.1466972724@sss.pgh.pa.us>
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Per buildfarm.
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Commit b1a9bad9e744 introduced a stats view to provide insight into the
running WAL receiver, but neglected to include the connection string in
it, as reported by Michaël Paquier. This commit fixes that omission.
(Any security-sensitive information is not disclosed).
While at it, close the mild security hole that we were exposing the
password in the connection string in shared memory. This isn't
user-accessible, but it still looks like a good idea to avoid having the
cleartext password in memory.
Author: Michaël Paquier, Álvaro Herrera
Review by: Vik Fearing
Discussion: https://www.postgresql.org/message-id/CAB7nPqStg4M561obo7ryZ5G+fUydG4v1Ajs1xZT1ujtu+woRag@mail.gmail.com
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Since get_relation_foreign_keys doesn't try to determine whether RTEs
are actually part of the query semantics, it might make FK info records
linking to RTEs that won't have a RelOptInfo at all. Cope with that.
Per bug #14219 from Andrew Gierth.
Report: <20160629183338.1397.43514@wrigleys.postgresql.org>
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Fix some now-obsolete statements that were overlooked in commits
6734a1cac, 3dbbd0f02, 028350f61. Document the behavior of <0>.
Also do a little bit of rearranging and copy-editing for clarity.
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Commit 3bd261ca18c67eafe18088e58fab511e3b965418 should have updated
this, but didn't.
Extracted from a larger patch by Piotr Stefaniak.
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Oleg Bartunov
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Reported-by: Manlio Perillo
Bug: 14016
Discussion: 20160311163928.6674.94707@wrigleys.postgresql.org
Reviewed-by: David G. Johnston
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SSDs are no longer exotic, so recommend a default in the hundreds for
them.
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These arguments became unused in commit 2c03216d8311. Noticed while
skimming code for unrelated development.
This is cosmetic, so no backpatch.
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This is a followup to commit 6d8b2aa83af70e20323caf23961667dc4c149276.
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Used to say "character set conversion"
Reported-by: Tatsuo Ishii
Discussion: 20160618.210417.343199294611427151.t-ishii@sraoss.co.jp
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UT1 was incorrectly specified as our time representation. (UT1 is
astronomical time.) We are not actually UTC either because we ignore
leap seconds.
Reported-by: Thomas Munro
Discussion: CAEepm=3-TW9PLwGZhqjSSiEQ9UzJEKE-HELQDzRE0QUSCp8dgw@mail.gmail.com
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If we need to use a gating Result node for pseudoconstant quals,
create_scan_plan() intentionally suppresses use_physical_tlist's checks
on whether there are matches for sortgroupref labels, on the grounds that
we don't need matches because we can label the Result's projection output
properly. However, it then called apply_pathtarget_labeling_to_tlist
anyway. This oversight was harmless when written, but in commit aeb9ae645
I made that function throw an error if there was no match. Thus, the
combination of a table scan, pseudoconstant quals, and a non-simple-Var
sortgroupref column threw the dreaded "ORDER/GROUP BY expression not found
in targetlist" error. To fix, just skip applying the labeling in this
case. Per report from Rushabh Lathia.
Report: <CAGPqQf2iLB8t6t-XrL-zR233DFTXxEsfVZ4WSqaYfLupEoDxXA@mail.gmail.com>
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Michael Paquier
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Previously, these commands always planned the given query and went through
executor startup before deciding not to actually run the query if WITH NO
DATA is specified. This behavior is problematic for pg_dump because it
may cause errors to be raised that we would rather not see before a
REFRESH MATERIALIZED VIEW command is issued. See for example bug #13907
from Marian Krucina. This change is not sufficient to fix that particular
bug, because we also need to tweak pg_dump to issue the REFRESH later,
but it's a necessary step on the way.
A user-visible side effect of doing things this way is that the returned
command tag for WITH NO DATA cases will now be "CREATE MATERIALIZED VIEW"
or "CREATE TABLE AS", not "SELECT 0". We could preserve the old behavior
but it would take more code, and arguably that was just an implementation
artifact not intended behavior anyhow.
In 9.5 and HEAD, also get rid of the static variable CreateAsReladdr, which
was trouble waiting to happen; there is not any prohibition on nested
CREATE commands.
Back-patch to 9.3 where CREATE MATERIALIZED VIEW was introduced.
Michael Paquier and Tom Lane
Report: <20160202161407.2778.24659@wrigleys.postgresql.org>
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<-> operator now have higher predecence than & (AND) operator. This change
was motivated by unexpected difference of similar queries:
'a & b <-> c'::tsquery and 'b <-> c & a'. Before first query means
(a & b) <-> c and second one - '(b <-> c) & a', now phrase operator evaluates
first.
Per suggestion from Tom Lane 32260.1465402409@sss.pgh.pa.us
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If there is no positional information of lexemes then phrase operator will not
fallback to AND operator. This change makes needing to modify TS_execute()
interface, because somewhere (in indexes, for example) positional information
is unaccesible and in this cases we need to force fallback to AND.
Per discussion c19fcfec308e6ccd952cdde9e648b505@mail.gmail.com
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Phrase operator now requires exact distance betweens lexems instead of
less-or-equal.
Per discussion c19fcfec308e6ccd952cdde9e648b505@mail.gmail.com
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It's rather silly to make a separate pass over the tlist + HAVING qual,
and a separate set of visits to the syscache, when get_agg_clause_costs
already has all the required information in hand. This nets out as less
code as well as fewer cycles.
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The original coding had three separate booleans representing partial
aggregation behavior, which was confusing, unreadable, and error-prone,
not least because the booleans weren't always listed in the same order.
It was also inadequate for the allegedly-desirable future extension to
support intermediate partial aggregation, because we'd need separate
markers for serialization and deserialization in such a case.
Merge these bools into an enum "AggSplit" to provide symbolic names for
the supported operating modes (and document what those are). By assigning
the values of the enum constants carefully, we can treat AggSplit values
as options bitmasks so that tests of what to do aren't noticeably more
expensive than before.
While at it, get rid of Aggref.aggoutputtype. That's not needed since
commit 59a3795c2 got rid of setrefs.c's special-purpose Aggref comparison
code, and it likewise seemed more confusing than helpful.
Assorted comment cleanup as well (there's still more that I want to do
in that line).
catversion bump for change in Aggref node contents. Should be the last
one for partial-aggregation changes.
Discussion: <29309.1466699160@sss.pgh.pa.us>
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Commit e06a38965's original coding for constructing the execution-time
expression tree for a combining aggregate was rather messy, involving
duplicating quite a lot of code in setrefs.c so that it could inject
a nonstandard matching rule for Aggrefs. Get rid of that in favor of
explicitly constructing a combining Aggref with a partial Aggref as input,
then allowing setref's normal matching logic to match the partial Aggref
to the output of the lower plan node and hence replace it with a Var.
In passing, rename and redocument make_partialgroup_input_target to have
some connection to what it actually does.
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After pg_upgrade, it is possible that some tuples' Xmax have multixacts
corresponding to the old installation; such multixacts cannot have
running members anymore. In many code sites we already know not to read
them and clobber them silently, but at least when VACUUM tries to freeze
a multixact or determine whether one needs freezing, there's an attempt
to resolve it to its member transactions by calling GetMultiXactIdMembers,
and if the multixact value is "in the future" with regards to the
current valid multixact range, an error like this is raised:
ERROR: MultiXactId 123 has not been created yet -- apparent wraparound
and vacuuming fails. Per discussion with Andrew Gierth, it is completely
bogus to try to resolve multixacts coming from before a pg_upgrade,
regardless of where they stand with regards to the current valid
multixact range.
It's possible to get from under this problem by doing SELECT FOR UPDATE
of the problem tuples, but if tables are large, this is slow and
tedious, so a more thorough solution is desirable.
To fix, we realize that multixacts in xmax created in 9.2 and previous
have a specific bit pattern that is never used in 9.3 and later (we
already knew this, per comments and infomask tests sprinkled in various
places, but we weren't leveraging this knowledge appropriately).
Whenever the infomask of the tuple matches that bit pattern, we just
ignore the multixact completely as if Xmax wasn't set; or, in the case
of tuple freezing, we act as if an unwanted value is set and clobber it
without decoding. This guarantees that no errors will be raised, and
that the values will be progressively removed until all tables are
clean. Most callers of GetMultiXactIdMembers are patched to recognize
directly that the value is a removable "empty" multixact and avoid
calling GetMultiXactIdMembers altogether.
To avoid changing the signature of GetMultiXactIdMembers() in back
branches, we keep the "allow_old" boolean flag but rename it to
"from_pgupgrade"; if the flag is true, we always return an empty set
instead of looking up the multixact. (I suppose we could remove the
argument in the master branch, but I chose not to do so in this commit).
This was broken all along, but the error-facing message appeared first
because of commit 8e9a16ab8f7f and was partially fixed in a25c2b7c4db3.
This fix, backpatched all the way back to 9.3, goes approximately in the
same direction as a25c2b7c4db3 but should cover all cases.
Bug analysis by Andrew Gierth and Álvaro Herrera.
A number of public reports match this bug:
https://www.postgresql.org/message-id/20140330040029.GY4582@tamriel.snowman.net
https://www.postgresql.org/message-id/538F3D70.6080902@publicrelay.com
https://www.postgresql.org/message-id/556439CF.7070109@pscs.co.uk
https://www.postgresql.org/message-id/SG2PR06MB0760098A111C88E31BD4D96FB3540@SG2PR06MB0760.apcprd06.prod.outlook.com
https://www.postgresql.org/message-id/20160615203829.5798.4594@wrigleys.postgresql.org
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When the index is predicted to need more than NBuffers buckets,
CREATE INDEX attempts to sort the index entries by hash key before
insertion, so as to reduce thrashing. This code path got broken by
commit 9f03ca915196dfc8, which overlooked that _hash_form_tuple() is not
just an alias for index_form_tuple(). The index got built anyway, but
with garbage data, so that searches for pre-existing tuples always
failed. Fix by refactoring to separate construction of the indexable
data from calling index_form_tuple().
Per bug #14210 from Daniel Newman. Back-patch to 9.5 where the
bug was introduced.
Report: <20160623162507.17237.39471@wrigleys.postgresql.org>
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something.* IS NOT NULL means that every attribute of the row is not
NULL, not that the row itself is non-NULL (e.g. because it's coming
from below an outer join. Use (somevar.*)::pg_catalog.text IS NOT
NULL instead.
Ashutosh Bapat, per a report by Rushabh Lathia. Reviewed by
Amit Langote and Etsuro Fujita. Schema-qualification added by me.
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Etsuro Fujita
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This was inadvertantly omitted from commit
7655f4ccea570d57c4d473cd66b755c03c904942. Mea culpa.
Backpatched to 9.5 where pager_min_lines was introduced.
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A deserialize function's result is short-lived data during partial
aggregation, since we're just going to pass it to the combine function
and then it's of no use anymore. However, the built-in deserialize
functions allocated their results in the aggregate state context,
resulting in a query-lifespan memory leak. It's probably not possible for
this to amount to anything much at present, since the number of leaked
results would only be the number of worker processes. But it might become
a problem in future. To fix, don't use the same convenience subroutine for
setting up results that the aggregate transition functions use.
David Rowley
Report: <10050.1466637736@sss.pgh.pa.us>
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Add a section to xaggr.sgml, as we have done in the past for other
extensions to the aggregation functionality. Assorted wordsmithing
and other minor improvements.
David Rowley and Tom Lane
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Looks like we had some more catalog drift recently.
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The original specification for this called for the deserialization function
to have signature "deserialize(serialtype) returns transtype", which is a
security violation if transtype is INTERNAL (which it always would be in
practice) and serialtype is not (which ditto). The patch blithely overrode
the opr_sanity check for that, which was sloppy-enough work in itself,
but the indisputable reason this cannot be allowed to stand is that CREATE
FUNCTION will reject such a signature and thus it'd be impossible for
extensions to create parallelizable aggregates.
The minimum fix to make the signature type-safe is to add a second, dummy
argument of type INTERNAL. But to lock it down a bit more and make misuse
of INTERNAL-accepting functions less likely, let's get rid of the ability
to specify a "serialtype" for an aggregate and just say that the only
useful serialtype is BYTEA --- which, in practice, is the only interesting
value anyway, due to the usefulness of the send/recv infrastructure for
this purpose. That means we only have to allow "serialize(internal)
returns bytea" and "deserialize(bytea, internal) returns internal" as
the signatures for these support functions.
In passing fix bogus signature of int4_avg_combine, which I found thanks
to adding an opr_sanity check on combinefunc signatures.
catversion bump due to removing pg_aggregate.aggserialtype and adjusting
signatures of assorted built-in functions.
David Rowley and Tom Lane
Discussion: <27247.1466185504@sss.pgh.pa.us>
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Commit 0b0baf262 et al made this case print "(null)" on the grounds that
that's what happened on platforms that didn't crash. But neither behavior
was actually intentional. What we should print is just an empty string,
for compatibility with the behavior of SHOW and other ways of examining
string GUCs. Those code paths don't distinguish NULL from empty strings,
so we should not here either. Per gripe from Alain Radix.
Like the previous patch, back-patch to 9.2 where -C option was introduced.
Discussion: <CA+YdpwxPUADrmxSD7+Td=uOshMB1KkDN7G7cf+FGmNjjxMhjbw@mail.gmail.com>
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Drop test_schema at the end, because that otherwise interferes with the
collate.linux.utf8 test.
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Reported-by: David G. Johnston
Discussion: CAKFQuwZZvnxwSq9tNtvL+uyuDKGgV91zR_agtPxQHRWMWQRP8g@mail.gmail.com
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If there's anyplace in our SGML docs that explains this behavior, I can't
find it right at the moment. Add an explanation in "Dependency Tracking"
which seems like the authoritative place for such a discussion. Per
gripe from Michelle Schwan.
While at it, update this section's example of a dependency-related
error message: they last looked like that in 8.3. And remove the
explanation of dependency updates from pre-7.3 installations, which
is probably no longer worth anybody's brain cells to read.
The bogus error message example seems like an actual documentation bug,
so back-patch to all supported branches.
Discussion: <20160620160047.5792.49827@wrigleys.postgresql.org>
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The original upper-planner-pathification design (commit 3fc6e2d7f5b652b4)
assumed that we could always determine during Path formation whether or not
we would need a Result plan node to perform projection of a targetlist.
That turns out not to work very well, though, because createplan.c still
has some responsibilities for choosing the specific target list associated
with sorting/grouping nodes (in particular it might choose to add resjunk
columns for sorting). We might not ever refactor that --- doing so would
push more work into Path formation, which isn't attractive --- and we
certainly won't do so for 9.6. So, while create_projection_path and
apply_projection_to_path can tell for sure what will happen if the subpath
is projection-capable, they can't tell for sure when it isn't. This is at
least a latent bug in apply_projection_to_path, which might think it can
apply a target to a non-projecting node when the node will end up computing
something different.
Also, I'd tied the creation of a ProjectionPath node to whether or not a
Result is needed, but it turns out that we sometimes need a ProjectionPath
node anyway to avoid modifying a possibly-shared subpath node. Callers had
to use create_projection_path for such cases, and we added code to them
that knew about the potential omission of a Result node and attempted to
adjust the cost estimates for that. That was uncertainly correct and
definitely ugly/unmaintainable.
To fix, have create_projection_path explicitly check whether a Result
is needed and adjust its cost estimate accordingly, though it creates
a ProjectionPath in either case. apply_projection_to_path is now mostly
just an optimized version that can avoid creating an extra Path node when
the input is known to not be shared with any other live path. (There
is one case that create_projection_path doesn't handle, which is pushing
parallel-safe expressions below a Gather node. We could make it do that
by duplicating the GatherPath, but there seems no need as yet.)
create_projection_plan still has to recheck the tlist-match condition,
which means that if the matching situation does get changed by createplan.c
then we'll have made a slightly incorrect cost estimate. But there seems
no help for that in the near term, and I doubt it occurs often enough,
let alone would change planning decisions often enough, to be worth
stressing about.
I added a "dummypp" field to ProjectionPath to track whether
create_projection_path thinks a Result is needed. This is not really
necessary as-committed because create_projection_plan doesn't look at the
flag; but it seems like a good idea to remember what we thought when
forming the cost estimate, if only for debugging purposes.
In passing, get rid of the target_parallel parameter added to
apply_projection_to_path by commit 54f5c5150. I don't think that's a good
idea because it involves callers in what should be an internal decision,
and opens us up to missing optimization opportunities if callers think they
don't need to provide a valid flag, as most don't. For the moment, this
just costs us an extra has_parallel_hazard call when planning a Gather.
If that starts to look expensive, I think a better solution would be to
teach PathTarget to carry/cache knowledge of parallel-safety of its
contents.
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Per report from Andreas Seltenreich. Back-patch to affected versions.
Report: <874m8nn0hv.fsf@elite.ansel.ydns.eu>
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Per buildfarm. Fortunately, it's not quite too late to squeeze this fix
into the pg_trgm 1.3 update.
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Specifically, --source-pgdata and --source-server.
Discussion: 20160617155108.GC19359@momjian.us
Reviewed-by: Michael Paquier
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There was some very strange code here, dating to commit b525bf77, that
purported to work around an ancient gcc bug by forcing a float4 comparison
to be done as int instead. Commit 5871b8848 broke that when it changed
one side of the comparison to "double" but left the comparison code alone.
Commit f576b17cd doubled down on the weirdness by introducing a "volatile"
marker, which had nothing to do with the actual problem.
Guess that the gcc bug, even if it's still present in the wild, was
triggered by comparison of float4's and can be avoided if we store the
result of cnt_sml() into a double before comparing to the double "nlimit".
This will at least work correctly on non-broken compilers, and it's way
more readable.
Per bug #14202 from Greg Navis. Add a regression test based on his
example.
Report: <20160620115321.5792.10766@wrigleys.postgresql.org>
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Source-Git-URL: git://git.postgresql.org/git/pgtranslation/messages.git
Source-Git-Hash: 0c374f8d25ed31833a10d24252bc928d41438838
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Noted by Lukas Fittl
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Dilian Palauzov pointed out in bug #14201 that the docs failed to mention
the possibility of %R producing '(' due to an unmatched parenthesis.
He proposed just adding that in the same style as the other options were
listed; but it seemed to me that the sentence was already nearly
unintelligible, so I rewrote it a bit more extensively.
Report: <20160619121113.5789.68274@wrigleys.postgresql.org>
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The annotation for "ERROR: language "foo" is not trusted" used to say
"HINT: Only superusers can use untrusted languages", which was fairly
poorly thought out. For one thing, it's not a hint about what to do,
but a statement of fact, which makes it errdetail. But also, this
fails to clarify things much, because there's a missing step in the
chain of reasoning. I think it's more useful to say "GRANT and REVOKE
are not allowed on untrusted languages, because only superusers can use
untrusted languages".
It's been like this for a long time, but given the lack of previous
complaints, I don't think this is worth back-patching.
Discussion: <1417.1466289901@sss.pgh.pa.us>
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