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Prefer pg_any_to_server/pg_server_to_any over pg_do_encoding_conversion.

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A large majority of the callers of pg_do_encoding_conversion were
specifying the database encoding as either source or target of the
conversion, meaning that we can use the less general functions
pg_any_to_server/pg_server_to_any instead.

The main advantage of using the latter functions is that they can make use
of a cached conversion-function lookup in the common case that the other
encoding is the current client_encoding.  It's notationally cleaner too in
most cases, not least because of the historical artifact that the latter
functions use "char *" rather than "unsigned char *" in their APIs.

Note that pg_any_to_server will apply an encoding verification step in
some cases where pg_do_encoding_conversion would have just done nothing.
This seems to me to be a good idea at most of these call sites, though
it partially negates the performance benefit.

Per discussion of bug #9210.
This commit is contained in:
Tom Lane
2014-02-23 16:59:05 -05:00
parent 49c817eab7
commit 769065c1b2
12 changed files with 50 additions and 99 deletions
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10
src/backend/snowball/dict_snowball.c
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@ -255,10 +255,7 @@ dsnowball_lexize(PG_FUNCTION_ARGS)
{
char *recoded;
recoded = (char *) pg_do_encoding_conversion((unsigned char *) txt,
strlen(txt),
GetDatabaseEncoding(),
PG_UTF8);
recoded = pg_server_to_any(txt, strlen(txt), PG_UTF8);
if (recoded != txt)
{
pfree(txt);
@ -284,10 +281,7 @@ dsnowball_lexize(PG_FUNCTION_ARGS)
{
char *recoded;
recoded = (char *) pg_do_encoding_conversion((unsigned char *) txt,
strlen(txt),
PG_UTF8,
GetDatabaseEncoding());
recoded = pg_any_to_server(txt, strlen(txt), PG_UTF8);
if (recoded != txt)
{
pfree(txt);