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The idea is to encourage more the use of these new routines across the
tree, as these offer stronger type safety guarantees than palloc().
The following paths are included in this batch, treating all the areas
proposed by the author for the most trivial changes, except src/backend
(by far the largest batch):
src/bin/
src/common/
src/fe_utils/
src/include/
src/pl/
src/test/
src/tutorial/
Similar work has been done in 31d3847a37be.
The code compiles the same before and after this commit, with the
following exceptions due to changes in line numbers because some of the
new allocation formulas are shorter:
blkreftable.c
pgfnames.c
pl_exec.c
Author: David Geier <geidav.pg@gmail.com>
Discussion: https://postgr.es/m/ad0748d4-3080-436e-b0bc-ac8f86a3466a@gmail.com
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Up to now we've contented ourselves with a one-size-fits-all error
hint when we fail to find any match to a function or procedure call.
That was mostly okay in the beginning, but it was never great, and
since the introduction of named arguments it's really not adequate.
We at least ought to distinguish "function name doesn't exist" from
"function name exists, but not with those argument names". And the
rules for named-argument matching are arcane enough that some more
detail seems warranted if we match the argument names but the call
still doesn't work.
This patch creates a framework for dealing with these problems:
FuncnameGetCandidates and related code will now pass back a bitmask of
flags showing how far the match succeeded. This allows a considerable
amount of granularity in the reports. The set-bits-in-a-bitmask
approach means that when there are multiple candidate functions, the
report will reflect the match(es) that got the furthest, which seems
correct. Also, we can avoid mentioning "maybe add casts" unless
failure to match argument types is actually the issue.
Extend the same return-a-bitmask approach to OpernameGetCandidates.
The issues around argument names don't apply to operator syntax,
but it still seems worth distinguishing between "there is no
operator of that name" and "we couldn't match the argument types".
While at it, adjust these messages and related ones to more strictly
separate "detail" from "hint", following our message style guidelines'
distinction between those.
Reported-by: Dominique Devienne <ddevienne@gmail.com>
Author: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Robert Haas <robertmhaas@gmail.com>
Discussion: https://postgr.es/m/1756041.1754616558@sss.pgh.pa.us
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This is allowed in C11, so we don't need the workaround guards against
it anymore. This effectively reverts commit 382092a0cd2 that put
these guards in place.
Reviewed-by: Chao Li <li.evan.chao@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/10d32190-f31b-40a5-b177-11db55597355@eisentraut.org
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format_procedure leaks memory, so run it in a short-lived context
not the session-lifespan cache context for the PL/pgSQL function.
parse_datatype called the core parser in the function's cache context,
thus leaking potentially a lot of storage into that context. We were
also being a bit careless with the TypeName structures made in that
code path and others. Most of the time we don't need to retain the
TypeName, so make sure it is made in the short-lived temp context,
and copy it only if we do need to retain it.
These are far from the only leaks in PL/pgSQL compilation, but
they're the biggest as far as I've seen, and further improvement
looks like it'd require delicate and bug-prone surgery.
Author: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/285483.1746756246@sss.pgh.pa.us
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The warning, visible when building with -O3 and a recent-ish gcc, is due to
gcc not realizing that found is a byvalue type and therefore will never be
interpreted as a varlena type.
Discussion: https://postgr.es/m/3prdb6hkep3duglhsujrn52bkvnlkvhc54fzvph2emrsm4vodl@77yy6j4hkemb
Discussion: https://postgr.es/m/20230316172818.x6375uvheom3ibt2%40awork3.anarazel.de
Discussion: https://postgr.es/m/20240207203138.sknifhlppdtgtxnk%40awork3.anarazel.de
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pl/pgsql's notion of an "expression" is very broad, encompassing
any SQL SELECT query that returns a single column and no more than
one row. So there are cases, for example evaluation of an aggregate
function, where the query involves significant work and it'd be useful
to run it with parallel workers. This used to be possible, but
commits 3eea7a0c9 et al unintentionally disabled it.
The simplest fix is to make exec_eval_expr() pass maxtuples = 0
rather than 2 to exec_run_select(). This avoids the new rule that
we will never use parallelism when a nonzero "count" limit is passed
to ExecutorRun(). (Note that the pre-3eea7a0c9 behavior was indeed
unsafe, so reverting that rule is not in the cards.) The reason
for passing 2 before was that exec_eval_expr() will throw an error
if it gets more than one returned row, so we figured that as soon
as we have two rows we know that will happen and we might as well
stop running the query. That choice was cost-free when it was made;
but disabling parallelism is far from cost-free, so now passing 2
amounts to optimizing a failure case at the expense of useful cases.
An expression query that can return more than one row is certainly
broken. People might now need to wait a bit longer to discover such
breakage; but hopefully few will use enormously expensive cases as
their first test of new pl/pgsql logic.
Author: Dipesh Dhameliya <dipeshdhameliya125@gmail.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CABgZEgdfbnq9t6xXJnmXbChNTcWFjeM_6nuig41tm327gYi2ig@mail.gmail.com
Backpatch-through: 13
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The current code in resolve_column_ref (dating to commits 01f7d2990
and fe24d7816) believes that not finding a RECFIELD datum is a
can't-happen case, in consequence of which I didn't spend a whole lot
of time considering what to do if it did happen. But it turns out
that it *can* happen if the would-be field name is a fully-reserved
PL/pgSQL keyword. Change the error message to describe that
situation, and add a test case demonstrating it.
This might need further refinement if anyone can find other ways to
trigger a failure here; but without an example it's not clear what
other error to throw.
Author: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Pavel Stehule <pavel.stehule@gmail.com>
Discussion: https://postgr.es/m/2185258.1745617445@sss.pgh.pa.us
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On close inspection, there does not seem to be a strong reason
why these should be fully-reserved keywords. I guess they just
escaped consideration in previous attempts to minimize PL/pgSQL's
list of reserved words.
Author: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Pavel Stehule <pavel.stehule@gmail.com>
Discussion: https://postgr.es/m/2185258.1745617445@sss.pgh.pa.us
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In pl_comp.c, initially create the plpgsql function's cache context
under the assumed-short-lived caller's context, and reparent it under
CacheMemoryContext only upon success. This avoids a process-lifespan
leak of 8kB or more if the function contains syntax errors. (This
leakage has existed for a long time without many complaints, but as
we move towards a possibly multi-threaded future, getting rid of
process-lifespan leaks grows more important.)
In funccache.c, arrange to reclaim the CachedFunction struct in case
the language-specific compile callback function throws an error;
previously, that resulted in an independent process-lifespan leak.
This is arguably a new bug in v18, since the leakage now occurred
for SQL-language functions as well as plpgsql.
Also, don't fill fn_xmin/fn_tid/dcallback until after successful
completion of the compile callback. This avoids a scenario where a
partially-built function cache might appear already valid upon later
inspection, and another scenario where dcallback might fail upon being
presented with an incomplete cache entry. We would have to reach such
a faulty cache entry via a pre-existing fn_extra pointer, so I'm not
sure these scenarios correspond to any live bug. (The predecessor
code in pl_comp.c never took any care about this, and we've heard no
complaints about that.) Still, it's better to be careful.
Given the lack of field complaints, I'm not very excited about
back-patching any of this; but it seems still in-scope for v18.
Discussion: https://postgr.es/m/999171.1748300004@sss.pgh.pa.us
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Source-Git-URL: https://git.postgresql.org/git/pgtranslation/messages.git
Source-Git-Hash: f90ee4803c30491e5c49996b973b8a30de47bfb2
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In the historical implementation of SQL functions (if they don't get
inlined), we built plans for all the contained queries at first call
within an outer query, and then re-used those plans for the duration
of the outer query, and then forgot everything. This was not ideal,
not least because the plans could not be customized to specific values
of the function's parameters. Our plancache infrastructure seems
mature enough to be used here. That will solve both the problem with
not being able to build custom plans and the problem with not being
able to share work across successive outer queries.
Aside from those performance concerns, this change fixes a
longstanding bugaboo with SQL functions: you could not write DDL that
would affect later statements in the same function. That's mostly
still true with new-style SQL functions, since the results of parse
analysis are baked into the stored query trees (and protected by
dependency records). But for old-style SQL functions, it will now
work much as it does with PL/pgSQL functions, because we delay parse
analysis and planning of each query until we're ready to run it.
Some edge cases that require replanning are now handled better too;
see for example the new rowsecurity test, where we now detect an RLS
context change that was previously missed.
One other edge-case change that might be worthy of a release note
is that we now insist that a SQL function's result be generated
by the physically-last query within it. Previously, if the last
original query was deleted by a DO INSTEAD NOTHING rule, we'd be
willing to take the result from the preceding query instead.
This behavior was undocumented except in source-code comments,
and it seems hard to believe that anyone's relying on it.
Along the way to this feature, we needed a few infrastructure changes:
* The plancache can now take either a raw parse tree or an
analyzed-but-not-rewritten Query as the starting point for a
CachedPlanSource. If given a Query, it is caller's responsibility
that nothing will happen to invalidate that form of the query.
We use this for new-style SQL functions, where what's in pg_proc is
serialized Query(s) and we trust the dependency mechanism to disallow
DDL that would break those.
* The plancache now offers a way to invoke a post-rewrite callback
to examine/modify the rewritten parse tree when it is rebuilding
the parse trees after a cache invalidation. We need this because
SQL functions sometimes adjust the parse tree to make its output
exactly match the declared result type; if the plan gets rebuilt,
that has to be re-done.
* There is a new backend module utils/cache/funccache.c that
abstracts the idea of caching data about a specific function
usage (a particular function and set of input data types).
The code in it is moved almost verbatim from PL/pgSQL, which
has done that for a long time. We use that logic now for
SQL-language functions too, and maybe other PLs will have use
for it in the future.
Author: Alexander Pyhalov <a.pyhalov@postgrespro.ru>
Co-authored-by: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Pavel Stehule <pavel.stehule@gmail.com>
Discussion: https://postgr.es/m/8216639.NyiUUSuA9g@aivenlaptop
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It seems potentially useful to label our shared libraries with version
information, now that a facility exists for retrieving that. This
patch labels them with the PG_VERSION string. There was some
discussion about using semantic versioning conventions, but that
doesn't seem terribly helpful for modules with no SQL-level presence;
and for those that do have SQL objects, we typically expect them
to support multiple revisions of the SQL definitions, so it'd still
not be very helpful.
I did not label any of src/test/modules/. It seems unnecessary since
we don't install those, and besides there ought to be someplace that
still provides test coverage for the original PG_MODULE_MAGIC macro.
Author: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/dd4d1b59-d0fe-49d5-b28f-1e463b68fa32@gmail.com
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The catchall exception condition OTHERS was represented as
sqlerrstate == 0, which was a poor choice because that comes
out the same as SQLSTATE '00000'. While we don't issue that
as an error code ourselves, there isn't anything particularly
stopping users from doing so. Use -1 instead, which can't
match any allowed SQLSTATE string.
While at it, invent a macro PLPGSQL_OTHERS to use instead of
a hard-coded magic number.
While this seems like a bug fix, I'm inclined not to back-patch.
It seems barely possible that someone has written code like this
and would be annoyed by changing the behavior in a minor release.
Reported-by: David Fiedler <david.fido.fiedler@gmail.com>
Author: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CAHjN70-=H5EpTOuZVbC8mPvRS5EfZ4MY2=OUdVDWoyGvKhb+Rw@mail.gmail.com
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Commit 682ce911f modified exec_save_simple_expr to accept a Param
in the tlist of a Gather node, rather than the normal case of a Var
referencing the Gather's input. It turns out that this was a kluge
to work around the bug later fixed in 0f7ec8d9c, namely that setrefs.c
was failing to replace Params in upper plan nodes with Var references
to the same Params appearing in the child tlists. With that fixed,
there seems no reason to continue to allow a Param here. (Moreover,
even if we did expect a Param here, the semantically correct thing
to do would be to take the Param as the expression being sought.
Whatever it may represent, it is *not* a reference to the child.)
Hence, revert that part of 682ce911f.
That all happened a long time ago. However, since the net effect
here is just to tighten an Assert condition, I'm content to change
it only in master.
Discussion: https://postgr.es/m/1565347.1742572349@sss.pgh.pa.us
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exec_save_simple_expr did not account for the possibility that
standard_planner would stick a Materialize node atop the plan
of even a simple Result, if CURSOR_OPT_SCROLL is set. This led
to an "unexpected plan node type" error.
This is a very old bug, but it'd only be reached by declaring a
cursor for a "SELECT simple-expression" query and explicitly
marking it scrollable, which is an odd thing to do. So the lack
of prior reports isn't too surprising.
Bug: #18859
Reported-by: Olleg Samoylov <splarv@ya.ru>
Author: Andrei Lepikhov <lepihov@gmail.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/18859-0d5f28ac99a37059@postgresql.org
Backpatch-through: 13
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We want to support a "noreturn" decoration on more compilers besides
just GCC-compatible ones, but for that we need to move the decoration
in front of the function declaration instead of either behind it or
wherever, which is the current style afforded by GCC-style attributes.
Also rename the macro to "pg_noreturn" to be similar to the C11
standard "noreturn".
pg_noreturn is now supported on all compilers that support C11 (using
_Noreturn), as well as GCC-compatible ones (using __attribute__, as
before), as well as MSVC (using __declspec). (When PostgreSQL
requires C11, the latter two variants can be dropped.)
Now, all supported compilers effectively support pg_noreturn, so the
extra code for !HAVE_PG_ATTRIBUTE_NORETURN can be dropped.
This also fixes a possible problem if third-party code includes
stdnoreturn.h, because then the current definition of
#define pg_attribute_noreturn() __attribute__((noreturn))
would cause an error.
Note that the C standard does not support a noreturn attribute on
function pointer types. So we have to drop these here. There are
only two instances at this time, so it's not a big loss. In one case,
we can make up for it by adding the pg_noreturn to a wrapper function
and adding a pg_unreachable(), in the other case, the latter was
already done before.
Reviewed-by: Dagfinn Ilmari Mannsåker <ilmari@ilmari.org>
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://www.postgresql.org/message-id/flat/pxr5b3z7jmkpenssra5zroxi7qzzp6eswuggokw64axmdixpnk@zbwxuq7gbbcw
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Formerly we only provided the column number, but it's frequently
more useful to mention the column name. The input tupdesc often
doesn't have useful column names, but the output tupdesc usually
contains user-supplied names, so report that one.
Author: Marcos Pegoraro <marcos@f10.com.br>
Co-authored-by: jian he <jian.universality@gmail.com>
Co-authored-by: Tom Lane <tgl@sss.pgh.pa.us>
Co-authored-by: Erik Wienhold <ewie@ewie.name>
Reviewed-by: Vladlen Popolitov <v.popolitov@postgrespro.ru>
Discussion: https://postgr.es/m/CAB-JLwanky28gjAMdnMh1CjyO1b2zLdr6UOA1-oY9G7PVL9KKQ@mail.gmail.com
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We've traditionally accepted "name := value" syntax for
cursor arguments in plpgsql. But it turns out that the
equivalent statements in Oracle use "name => value".
Since we accept both forms of punctuation for function
arguments, it makes sense to do the same here.
Author: Pavel Stehule <pavel.stehule@gmail.com>
Reviewed-by: Gilles Darold <gilles@darold.net>
Discussion: https://postgr.es/m/CAFj8pRA3d0ARQEMbABa1n6q25AUdNmyO8aGs56XNf9pD4sRMjQ@mail.gmail.com
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Commit 1dc5ebc90 allowed PL/pgSQL to perform in-place updates
of expanded-object variables that are being updated with
assignments like "x := f(x, ...)". However this was allowed
only for a hard-wired list of functions f(), since we need to
be sure that f() will not modify the variable if it fails.
It was always envisioned that we should make that extensible,
but at the time we didn't have a good way to do so. Since
then we've invented the idea of "support functions" to allow
attaching specialized optimization knowledge to functions,
and that is a perfect mechanism for doing this.
Hence, adjust PL/pgSQL to use a support function request instead
of hard-wired logic to decide if in-place update is safe.
Preserve the previous optimizations by creating support functions
for the three functions that were previously hard-wired.
Author: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Andrey Borodin <x4mmm@yandex-team.ru>
Reviewed-by: Pavel Borisov <pashkin.elfe@gmail.com>
Discussion: https://postgr.es/m/CACxu=vJaKFNsYxooSnW1wEgsAO5u_v1XYBacfVJ14wgJV_PYeg@mail.gmail.com
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If a read/write expanded variable is declared locally to the
assignment statement that is updating it, and it is referenced
exactly once in the assignment RHS, then we can optimize the
operation as a direct update of the expanded value, whether
or not the function(s) operating on it can be trusted not to
modify the value before throwing an error. This works because
if an error does get thrown, we no longer care what value the
variable has.
In cases where that doesn't work, fall back to the previous
rule that checks for safety of the top-level function.
In any case, postpone determination of whether these optimizations
are feasible until we are executing a Param referencing the target
variable and that variable holds a R/W expanded object. While the
previous incarnation of exec_check_rw_parameter was pretty cheap,
this is a bit less so, and our plan to invoke support functions
will make it even less so. So avoiding the check for variables
where it couldn't be useful should be a win.
Author: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Andrey Borodin <x4mmm@yandex-team.ru>
Reviewed-by: Pavel Borisov <pashkin.elfe@gmail.com>
Discussion: https://postgr.es/m/CACxu=vJaKFNsYxooSnW1wEgsAO5u_v1XYBacfVJ14wgJV_PYeg@mail.gmail.com
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Mark whether the target of a potentially optimizable assignment
is "local", in the sense of being declared inside any exception
block that could trap an error thrown from the assignment.
(This implies that we needn't preserve the variable's value
in case of an error. This patch doesn't do anything with the
knowledge, but the next one will.)
Normally, this requires a post-parsing scan of the function's
parse tree, since we don't know while parsing a BEGIN ...
construct whether we will find EXCEPTION at its end. However,
if there are no BEGIN ... EXCEPTION blocks in the function at
all, then all assignments are local, even those to variables
representing function arguments. We optimize that common case
by initializing the target_is_local flags to "true", and fixing
them up with a post-scan only if we found EXCEPTION.
Note that variables' default-value expressions are never interesting
for expanded-variable optimization, since they couldn't contain a
reference to the target variable anyway. But the code is set up
to compute their target_param and target_is_local correctly anyway,
for consistency and in case someone thinks of a use for that data.
I added a bit of plpgsql_dumptree support to help verify that this
code sets the flags as expected. I also added a plpgsql_dumptree
call in plpgsql_compile_inline. It was at best an oversight that
"#option dump" didn't work in a DO block; now it does.
Author: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Andrey Borodin <x4mmm@yandex-team.ru>
Reviewed-by: Pavel Borisov <pashkin.elfe@gmail.com>
Discussion: https://postgr.es/m/CACxu=vJaKFNsYxooSnW1wEgsAO5u_v1XYBacfVJ14wgJV_PYeg@mail.gmail.com
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This short and boring patch simply moves the responsibility for
initializing PLpgSQL_expr.target_param into plpgsql parsing,
rather than doing it at first execution of the expr as before.
This doesn't save anything in terms of runtime, since the work was
trivial and done only once per expr anyway. But it makes the info
available during parsing, which will be useful for the next step.
Likewise set PLpgSQL_expr.func during parsing. According to the
comments, this was once impossible; but it's certainly possible
since we invented the plpgsql_curr_compile variable. Again, this
saves little runtime, but it seems far cleaner conceptually.
While at it, I reordered stuff in struct PLpgSQL_expr to make it
clearer which fields are filled when, and merged some duplicative
code in pl_gram.y.
Author: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Andrey Borodin <x4mmm@yandex-team.ru>
Reviewed-by: Pavel Borisov <pashkin.elfe@gmail.com>
Discussion: https://postgr.es/m/CACxu=vJaKFNsYxooSnW1wEgsAO5u_v1XYBacfVJ14wgJV_PYeg@mail.gmail.com
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We haven't done this up to now because there was only one use-case,
namely plpgsql_free_function_memory's search for expressions to clean
up. However an upcoming patch has another need for walking plpgsql
functions' statement trees, so let's create sharable tree-walker
infrastructure in the same style as expression_tree_walker().
This patch actually makes the code shorter, although that's
mainly down to having used a more compact coding style. (I didn't
write a separate subroutine for each statement type, and I made
use of some newer notations like foreach_ptr.)
Author: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Andrey Borodin <x4mmm@yandex-team.ru>
Reviewed-by: Pavel Borisov <pashkin.elfe@gmail.com>
Discussion: https://postgr.es/m/CACxu=vJaKFNsYxooSnW1wEgsAO5u_v1XYBacfVJ14wgJV_PYeg@mail.gmail.com
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Some places spelled it "it's", which is short for "it is".
In passing, fix a couple other nearby grammatical errors.
Author: Jacob Brazeal <jacob.brazeal@gmail.com>
Discussion: https://postgr.es/m/CA+COZaAO8g1KJCV0T48=CkJMjAnnfTGLWOATz+2aCh40c2Nm+g@mail.gmail.com
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Instead of passing the parse result from yyparse() via a global
variable, pass it via a function output argument.
This complements earlier work to make the parsers reentrant.
Discussion: Discussion: https://www.postgresql.org/message-id/flat/eb6faeac-2a8a-4b69-9189-c33c520e5b7b@eisentraut.org
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The plpgsql scanner is a wrapper around the core scanner, which
already uses the flex %option reentrant. This patch only pushes up a
few levels the place where the scanner handle is allocated. Before,
it was allocated in pl_scanner.c in a global variable, so to the
outside the scanner was not reentrant. Now, it is allocated in
pl_comp.c and is passed as an argument to yyparse(), similar to how it
is handled in other reentrant scanners.
Also use flex yyextra to handle context information, instead of global
variables. Again, this uses the existing yyextra support in the core
scanner. This complements the other changes to make the scanner
reentrant.
The bison option %pure-parser is used to make the generated parser
pure. This happens in the usual way, since plpgsql has its own bison
parser definition.
Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi>
Discussion: https://www.postgresql.org/message-id/flat/eb6faeac-2a8a-4b69-9189-c33c520e5b7b@eisentraut.org
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This function apparently never existed.
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Backpatch-through: 13
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This was evidently missed in 05346c131, which renamed that
file to pl_gram.y.
Japin Li
Discussion: https://postgr.es/m/ME0P300MB0445F7CA7456C2AC67D37A01B6092@ME0P300MB0445.AUSP300.PROD.OUTLOOK.COM
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Rename "core_yy_extra_type core_yy" to "core_yy_extra". The previous
name was a bit unclear and confusing. The new name matches the name
used elsewhere for the same purpose, for example in
src/backend/parser/gramparse.h.
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Trying to clean up the code a bit while we're working on these files
for the reentrant scanner/pure parser patches. This cleanup only
touches the code sections after the second '%%' in each file, via a
manually-supervised and locally hacked up pgindent.
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Per git log, the last time someone tried to do something with
pgrminclude was around 2011. Many (not all) of the "pgrminclude
ignore" annotations are of a newer date but seem to have just been
copied around during refactorings and file moves and don't seem to
reflect an actual need anymore.
There have been some parallel experiments with include-what-you-use
(IWYU) annotations, but these don't seem to correspond very strongly
to pgrminclude annotations, so there is no value in keeping the
existing ones even for that kind of thing.
So, wipe them all away. We can always add new ones in the future
based on actual needs.
Discussion: https://www.postgresql.org/message-id/flat/2d4dc7b2-cb2e-49b1-b8ca-ba5f7024f05b%40eisentraut.org
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Many of them just seem to have been copied around for no real reason.
Their presence causes (small) risks of hiding actual type mismatches
or silently discarding qualifiers
Discussion: https://www.postgresql.org/message-id/flat/461ea37c-8b58-43b4-9736-52884e862820@eisentraut.org
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as determined by IWYU
Similar to commit dbbca2cf299, but for contrib, pl, and src/test/.
Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://www.postgresql.org/message-id/flat/0df1d5b1-8ca8-4f84-93be-121081bde049%40eisentraut.org
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If a R/W expanded-object pointer is passed as a function parameter,
take ownership of the object, regardless of its type. Previously
this happened only for expanded arrays, but that was a result of
sloppy thinking. (If the plpgsql function did not end by returning
the object, the result would be to leak the object until the
surrounding memory context is cleaned up. That's not awful,
since non-expanded values have always been managed that way,
but we can do better.)
Per discussion with Michel Pelletier. There's a lot more to do
here to make plpgsql work efficiently with expanded objects that
aren't arrays, but this is an easy first step.
Discussion: https://postgr.es/m/CACxu=vJaKFNsYxooSnW1wEgsAO5u_v1XYBacfVJ14wgJV_PYeg@mail.gmail.com
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Commit 2dc1deaea turns out to have been still a brick shy of a load,
because CALL statements executing within a plpgsql exception block
could still pass the wrong snapshot to stable functions within the
CALL's argument list. That happened because standard_ProcessUtility
forces isAtomicContext to true if IsTransactionBlock is true, which
it always will be inside a subtransaction. Then ExecuteCallStmt
would think it does not need to push a new snapshot --- but
_SPI_execute_plan didn't do so either, since it thought it was in
nonatomic mode.
The best fix for this seems to be for _SPI_execute_plan to operate
in atomic execution mode if IsSubTransaction() is true, even when the
SPI context as a whole is non-atomic. This makes _SPI_execute_plan
have the same rules about when non-atomic execution is allowed as
_SPI_commit/_SPI_rollback have about when COMMIT/ROLLBACK are allowed,
which seems appropriately symmetric. (If anyone ever tries to allow
COMMIT/ROLLBACK inside a subtransaction, this would all need to be
rethought ... but I'm unconvinced that such a thing could be logically
consistent at all.)
For further consistency, also check IsSubTransaction() in
SPI_inside_nonatomic_context. That does not matter for its
one present-day caller StartTransaction, which can't be reached
inside a subtransaction. But if any other callers ever arise,
they'd presumably want this definition.
Per bug #18656 from Alexander Alehin. Back-patch to all
supported branches, like previous fixes in this area.
Discussion: https://postgr.es/m/18656-cade1780866ef66c@postgresql.org
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SPI_connect/SPI_connect_ext have not returned any value other than
SPI_OK_CONNECT since commit 1833f1a1c in v10; any errors are thrown
via ereport. (The most likely failure is out-of-memory, which has
always been thrown that way, so callers had better be prepared for
such errors.) This makes it somewhat pointless to check these
functions' result, and some callers within our code haven't been
bothering; indeed, the only usage example within spi.sgml doesn't
bother. So it's likely that the omission has propagated into
extensions too.
Hence, let's standardize on not checking, and document the return
value as historical, while not actually changing these functions'
behavior. (The original proposal was to change their return type
to "void", but that would needlessly break extensions that are
conforming to the old practice.) This saves a small amount of
boilerplate code in a lot of places.
Stepan Neretin
Discussion: https://postgr.es/m/CAMaYL5Z9Uk8cD9qGz9QaZ2UBJFOu7jFx5Mwbznz-1tBbPDQZow@mail.gmail.com
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Author: Pavel Stehule <pavel.stehule@gmail.com>
Reviewed-by: Stepan Neretin <sncfmgg@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/CAFj8pRAw+OkVW=FgMKHKyvY3CgtWy3cWdY7XT+S5TJaTttu=oA@mail.gmail.com
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If the plancache entry for the CALL statement is already stale,
it's possible for us to fetch an old procedure OID out of it,
and then fail with "cache lookup failed for function NNN".
In ordinary usage this never happens because make_callstmt_target
is called just once immediately after building the plancache
entry. It can be forced however by setting up an erroneous CALL
(that causes make_callstmt_target itself to report an error),
then dropping/recreating the target procedure, then repeating
the erroneous CALL.
To fix, use SPI_plan_get_cached_plan() to fetch the plancache's
plan, rather than assuming we can use SPI_plan_get_plan_sources().
This shouldn't add any noticeable overhead in the normal case,
and in the stale-plan case we'd have had to replan anyway a little
further down.
The other callers of SPI_plan_get_plan_sources() seem OK, because
either they don't need up-to-date plans or they know that the
query was just (re) planned. But add some commentary in hopes
of not falling into this trap again.
Per bug #18574 from Song Hongyu. Back-patch to v14 where this coding
was introduced. (Older branches have comparable code, but it's run
after any required replanning, so there's no issue.)
Discussion: https://postgr.es/m/18574-2ce7ba3249221389@postgresql.org
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Before Bison 3.4, the generated parser implementation files run afoul
of -Wmissing-variable-declarations (in spite of commit ab61c40bfa2)
because declarations for yylval and possibly yylloc are missing. The
generated header files contain an extern declaration, but the
implementation files don't include the header files. Since Bison 3.4,
the generated implementation files automatically include the generated
header files, so then it works.
To make this work with older Bison versions as well, include the
generated header file from the .y file.
(With older Bison versions, the generated implementation file contains
effectively a copy of the header file pasted in, so including the
header file is redundant. But we know this works anyway because the
core grammar uses this arrangement already.)
Discussion: https://www.postgresql.org/message-id/flat/e0a62134-83da-4ba4-8cdb-ceb0111c95ce@eisentraut.org
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This adds extern declarations for some global variables produced by
Bison that are not already declared in its generated header file.
This is a workaround to be able to add -Wmissing-variable-declarations
to the global set of warning options in the near future.
Another longer-term solution would be to convert these grammars to
"pure" parsers in Bison, to avoid global variables altogether. Note
that the core grammar is already pure, so this patch did not need to
touch it.
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://www.postgresql.org/message-id/flat/e0a62134-83da-4ba4-8cdb-ceb0111c95ce@eisentraut.org
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We were not being clear about which variants of the "direction"
clause are permitted in MOVE. Also, the text seemed to be
written with only the FETCH/MOVE NEXT case in mind, so it
didn't apply very well to other variants.
Also, document that "MOVE count IN cursor" only works if count
is a constant. This is not the whole truth, because some other
cases such as a parenthesized expression will also work, but
we want to push people to use "MOVE FORWARD count" instead.
The constant case is enough to cover what we allow in plain SQL,
and that seems sufficient to claim support for.
Update a comment in pl_gram.y claiming that we don't document
that point.
Per gripe from Philipp Salvisberg.
Discussion: https://postgr.es/m/172155553388.702.7932496598218792085@wrigleys.postgresql.org
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These probably should have been static all along, it was only
forgotten out of sloppiness.
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://www.postgresql.org/message-id/flat/e0a62134-83da-4ba4-8cdb-ceb0111c95ce@eisentraut.org
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The previous coding here assumed that we didn't need to recheck any
of the querytree tests made in exec_simple_check_plan(). I think
we supposed that those properties were fully determined by the
syntax of the source text and hence couldn't change. That is true
for most of them, but at least hasTargetSRFs and hasAggs can change
by dint of forcibly dropping an originally-referenced function and
recreating it with new properties. That leads to "unexpected plan
node type" or similar failures.
These tests are pretty cheap compared to the cost of replanning, so
rather than sweat over exactly which properties need to be rechecked,
let's just recheck them all. Hence, factor out those tests into a new
function exec_is_simple_query(), and rearrange callers as needed.
A second problem in the same area was that if we failed during
replanning or during exec_save_simple_expr(), we'd potentially
leave behind now-dangling pointers to the old simple expression,
potentially resulting in crashes later. To fix, clear those pointers
before replanning.
The v12 code looks quite different in this area but still has the
bug about needing to recheck query simplicity. I chose to back-patch
all of the plpgsql_simple.sql test script, which formerly didn't exist
in this branch.
Per bug #18497 from Nikita Kalinin. Back-patch to all supported
branches.
Discussion: https://postgr.es/m/18497-fe93b6da82ce31d4@postgresql.org
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If the CALL is within an atomic context (e.g. there's an outer
transaction block), _SPI_execute_plan should acquire a fresh snapshot
to execute any such functions with. We failed to do that and instead
passed them the Portal snapshot, which had been acquired at the start
of the current SQL command. This'd lead to seeing stale values of
rows modified since the start of the command.
This is arguably a bug in 84f5c2908: I failed to see that "are we in
non-atomic mode" needs to be defined the same way as it is further
down in _SPI_execute_plan, i.e. check !_SPI_current->atomic not just
options->allow_nonatomic. Alternatively the blame could be laid on
plpgsql, which is unconditionally passing allow_nonatomic = true
for CALL/DO even when it knows it's in an atomic context. However,
fixing it in spi.c seems like a better idea since that will also fix
the problem for any extensions that may have copied plpgsql's coding
pattern.
While here, update an obsolete comment about _SPI_execute_plan's
snapshot management.
Per report from Victor Yegorov. Back-patch to all supported versions.
Discussion: https://postgr.es/m/CAGnEboiRe+fG2QxuBO2390F7P8e2MQ6UyBjZSL_w1Cej+E4=Vw@mail.gmail.com
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Most of the infrastructure for procedure arguments was already
okay with polymorphic output arguments, but it turns out that
CallStmtResultDesc() was a few bricks shy of a load here. It thought
all it needed to do was call build_function_result_tupdesc_t, but
that function specifically disclaims responsibility for resolving
polymorphic arguments. Failing to handle that doesn't seem to be
a problem for CALL in plpgsql, but CALL from plain SQL would get
errors like "cannot display a value of type anyelement", or even
crash outright.
In v14 and later we can simply examine the exposed types of the
CallStmt.outargs nodes to get the right type OIDs. But it's a lot
more complicated to fix in v12/v13, because those versions don't
have CallStmt.outargs, nor do they do expand_function_arguments
until ExecuteCallStmt runs. We have to duplicatively run
expand_function_arguments, and then re-determine which elements
of the args list are output arguments.
Per bug #18463 from Drew Kimball. Back-patch to all supported
versions, since it's busted in all of them.
Discussion: https://postgr.es/m/18463-f8cd77e12564d8a2@postgresql.org
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Source-Git-URL: https://git.postgresql.org/git/pgtranslation/messages.git
Source-Git-Hash: be182cc55e6f72c66215fd9b38851969e3ce5480
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Up to now, read_sql_construct() has collected all the source text from
the statement or expression's initial token up to the character just
before the "until" token. It normally tries to strip trailing
whitespace from that, largely for neatness. If there was a "-- text"
comment after the expression, this resulted in removing the newline
that terminates the comment, which creates a hazard if we try to paste
the collected text into a larger SQL construct without inserting a
newline after it. In particular this caused our handling of CASE
constructs to fail if there's a comment after a WHEN expression.
Commit 4adead1d2 noticed a similar problem with cursor arguments,
and worked around it through the rather crude hack of suppressing
the whitespace-trimming behavior for those. Rather than do that
and leave the hazard open for future hackers to trip over, let's
fix it properly. pl_scanner.c already has enough infrastructure
to report the end location of the expression's last token, so
we can copy up to that location and never collect any trailing
whitespace or comment to begin with.
Erik Wienhold and Tom Lane, per report from Michal Bartak.
Back-patch to all supported branches.
Discussion: https://postgr.es/m/CAAVzF_FjRoi8fOVuLCZhQJx6HATQ7MKm=aFOHWZODFnLmjX-xA@mail.gmail.com
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This allows a RETURNING clause to be appended to a MERGE query, to
return values based on each row inserted, updated, or deleted. As with
plain INSERT, UPDATE, and DELETE commands, the returned values are
based on the new contents of the target table for INSERT and UPDATE
actions, and on its old contents for DELETE actions. Values from the
source relation may also be returned.
As with INSERT/UPDATE/DELETE, the output of MERGE ... RETURNING may be
used as the source relation for other operations such as WITH queries
and COPY commands.
Additionally, a special function merge_action() is provided, which
returns 'INSERT', 'UPDATE', or 'DELETE', depending on the action
executed for each row. The merge_action() function can be used
anywhere in the RETURNING list, including in arbitrary expressions and
subqueries, but it is an error to use it anywhere outside of a MERGE
query's RETURNING list.
Dean Rasheed, reviewed by Isaac Morland, Vik Fearing, Alvaro Herrera,
Gurjeet Singh, Jian He, Jeff Davis, Merlin Moncure, Peter Eisentraut,
and Wolfgang Walther.
Discussion: http://postgr.es/m/CAEZATCWePEGQR5LBn-vD6SfeLZafzEm2Qy_L_Oky2=qw2w3Pzg@mail.gmail.com
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Previously, backend ID was an index into the ProcState array, in the
shared cache invalidation manager (sinvaladt.c). The entry in the
ProcState array was reserved at backend startup by scanning the array
for a free entry, and that was also when the backend got its backend
ID. Things become slightly simpler if we redefine backend ID to be the
index into the PGPROC array, and directly use it also as an index to
the ProcState array. This uses a little more memory, as we reserve a
few extra slots in the ProcState array for aux processes that don't
need them, but the simplicity is worth it.
Aux processes now also have a backend ID. This simplifies the
reservation of BackendStatusArray and ProcSignal slots.
You can now convert a backend ID into an index into the PGPROC array
simply by subtracting 1. We still use 0-based "pgprocnos" in various
places, for indexes into the PGPROC array, but the only difference now
is that backend IDs start at 1 while pgprocnos start at 0. (The next
commmit will get rid of the term "backend ID" altogether and make
everything 0-based.)
There is still a 'backendId' field in PGPROC, now part of 'vxid' which
encapsulates the backend ID and local transaction ID together. It's
needed for prepared xacts. For regular backends, the backendId is
always equal to pgprocno + 1, but for prepared xact PGPROC entries,
it's the ID of the original backend that processed the transaction.
Reviewed-by: Andres Freund, Reid Thompson
Discussion: https://www.postgresql.org/message-id/8171f1aa-496f-46a6-afc3-c46fe7a9b407@iki.fi
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