Hi,
Currently guc-file.c allows the following as guc names:
ID {LETTER}{LETTER_OR_DIGIT}*
QUALIFIED_ID {ID}"."{ID}
That is either one token starting with a letter followed by numbers or
letters or exactly two of those separated by a dot.
Those restrictions are existing for neither SET/set_config() via SQL nor
for postgres -c styles of setting options.
I propose loosening those restrictions to
a) allow repeatedly qualified names like a.b.c
b) allow variables to start with a digit from the second level onwards.
Additionally, should we perhaps enforce the same rules for -c and
set_config()/SET?
Trivial patch that only extends the space of valid names for
postgresql.conf attached.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
diff --git a/src/backend/utils/misc/guc-file.l b/src/backend/utils/misc/guc-file.l
index d3565a5..d9ef10e 100644
--- a/src/backend/utils/misc/guc-file.l
+++ b/src/backend/utils/misc/guc-file.l
@@ -78,7 +78,8 @@ LETTER [A-Za-z_\200-\377]
LETTER_OR_DIGIT [A-Za-z_0-9\200-\377]
ID {LETTER}{LETTER_OR_DIGIT}*
-QUALIFIED_ID {ID}"."{ID}
+SECONDARY_ID {LETTER_OR_DIGIT}+
+QUALIFIED_ID {ID}("."{SECONDARY_ID})+
UNQUOTED_STRING {LETTER}({LETTER_OR_DIGIT}|[-._:/])*
STRING \'([^'\\\n]|\\.|\'\')*\'
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