Don't fail for bad GUCs in CREATE FUNCTION with check_function_bodies off.

The previous coding attempted to activate all the GUC settings specified
in SET clauses, so that the function validator could operate in the GUC
environment expected by the function body.  However, this is problematic
when restoring a dump, since the SET clauses might refer to database
objects that don't exist yet.  We already have the parameter
check_function_bodies that's meant to prevent forward references in
function definitions from breaking dumps, so let's change CREATE FUNCTION
to not install the SET values if check_function_bodies is off.

Authors of function validators were already advised not to make any
"context sensitive" checks when check_function_bodies is off, if indeed
they're checking anything at all in that mode.  But extend the
documentation to point out the GUC issue in particular.

(Note that we still check the SET clauses to some extent; the behavior
with !check_function_bodies is now approximately equivalent to what ALTER
DATABASE/ROLE have been doing for awhile with context-dependent GUCs.)

This problem can be demonstrated in all active branches, so back-patch
all the way.

diff --git a/src/backend/catalog/pg_proc.c b/src/backend/catalog/pg_proc.c
index f84bfe4f6abc6c99117f5fa3c95457405416ad2d..3a2c817a8b3e84c6b50dd9d5aec3de85760839b1 100644 (file)
--- a/src/backend/catalog/pg_proc.c
+++ b/src/backend/catalog/pg_proc.c
@@ -561,24 +561,34 @@ ProcedureCreate(const char *procedureName,
        /* Verify function body */
        if (OidIsValid(languageValidator))
        {
-               ArrayType  *set_items;
-               int                     save_nestlevel;
+               ArrayType  *set_items = NULL;
+               int                     save_nestlevel = 0;
 
                /* Advance command counter so new tuple can be seen by validator */
                CommandCounterIncrement();
 
-               /* Set per-function configuration parameters */
-               set_items = (ArrayType *) DatumGetPointer(proconfig);
-               if (set_items)          /* Need a new GUC nesting level */
+               /*
+                * Set per-function configuration parameters so that the validation is
+                * done with the environment the function expects.      However, if
+                * check_function_bodies is off, we don't do this, because that would
+                * create dump ordering hazards that pg_dump doesn't know how to deal
+                * with.  (For example, a SET clause might refer to a not-yet-created
+                * text search configuration.)  This means that the validator
+                * shouldn't complain about anything that might depend on a GUC
+                * parameter when check_function_bodies is off.
+                */
+               if (check_function_bodies)
                {
-                       save_nestlevel = NewGUCNestLevel();
-                       ProcessGUCArray(set_items,
-                                                       (superuser() ? PGC_SUSET : PGC_USERSET),
-                                                       PGC_S_SESSION,
-                                                       GUC_ACTION_SAVE);
+                       set_items = (ArrayType *) DatumGetPointer(proconfig);
+                       if (set_items)          /* Need a new GUC nesting level */
+                       {
+                               save_nestlevel = NewGUCNestLevel();
+                               ProcessGUCArray(set_items,
+                                                               (superuser() ? PGC_SUSET : PGC_USERSET),
+                                                               PGC_S_SESSION,
+                                                               GUC_ACTION_SAVE);
+                       }
                }
-               else
-                       save_nestlevel = 0;             /* keep compiler quiet */
 
                OidFunctionCall1(languageValidator, ObjectIdGetDatum(retval));
 

diff --git a/src/test/regress/expected/guc.out b/src/test/regress/expected/guc.out
index a580daa089ddde3a05ede33c478abbe44d6707e6..0d1065f66fa2dcf9d8afecb3af633ce99646a29b 100644 (file)
--- a/src/test/regress/expected/guc.out
+++ b/src/test/regress/expected/guc.out
@@ -699,3 +699,19 @@ select myfunc(1), current_setting('regex_flavor');
  extended | extended
 (1 row)
 
+-- Normally, CREATE FUNCTION should complain about invalid values in
+-- function SET options; but not if check_function_bodies is off,
+-- because that creates ordering hazards for pg_dump
+create function func_with_bad_set() returns int as $$ select 1 $$
+language sql
+set default_text_search_config = no_such_config;
+NOTICE:  text search configuration "no_such_config" does not exist
+ERROR:  invalid value for parameter "default_text_search_config": "no_such_config"
+set check_function_bodies = off;
+create function func_with_bad_set() returns int as $$ select 1 $$
+language sql
+set default_text_search_config = no_such_config;
+NOTICE:  text search configuration "no_such_config" does not exist
+select func_with_bad_set();
+ERROR:  invalid value for parameter "default_text_search_config": "no_such_config"
+reset check_function_bodies;

diff --git a/src/test/regress/sql/guc.sql b/src/test/regress/sql/guc.sql
index 9966606275c9b32ac50182cb1974e0d18e6fdecd..e3c1b33c0fe896f5795bcb9aeb82cf287eb2805b 100644 (file)
--- a/src/test/regress/sql/guc.sql
+++ b/src/test/regress/sql/guc.sql
@@ -251,3 +251,21 @@ set regex_flavor = basic;
 select myfunc(0);
 select current_setting('regex_flavor');
 select myfunc(1), current_setting('regex_flavor');
+
+-- Normally, CREATE FUNCTION should complain about invalid values in
+-- function SET options; but not if check_function_bodies is off,
+-- because that creates ordering hazards for pg_dump
+
+create function func_with_bad_set() returns int as $$ select 1 $$
+language sql
+set default_text_search_config = no_such_config;
+
+set check_function_bodies = off;
+
+create function func_with_bad_set() returns int as $$ select 1 $$
+language sql
+set default_text_search_config = no_such_config;
+
+select func_with_bad_set();
+
+reset check_function_bodies;