V$sqlarea encoding

Question

I have plsql code looking something like that:
if v_state_flag = 'S' and v_next_query = 'Y' then
      PKG_COMMON.DEBUG ('GET_ADDRESS_LEVEL_LIST.30, fill o_state_list');
      -- kui #postal_flag = 'Y' ja #postalcode on antud, siis lisada klausel
      if v_postalcode_flag = 'S' and i_postal_code is not null then
         open o_state_list for
            select reg.CODE, reg.NAME from V_REGION_LANG reg
            where reg.LANGUAGE = PKG_SESSION.LANGUAGE_CODE
               and reg.COUNTRY = i_country
               and reg.REGION_LEVEL = 'STATE'
               and reg.CLOSED_TIME is null
               -- kui #postal_flag = 'Y' ja #postalcode on antud, siis lisada klausel
               and reg.CODE in (
               select r.REGION_CODE1 from REGION r, POSTALCODE p
               where r.COUNTRY = p.COUNTRY
               and r.CODE = p.REGION_CODE
               and p.POSTALCODE = i_postal_code
               and p.CLOSED_TIME is null
               );       View "v$sqlarea" shows this query as:
select * from v$sqlarea where
last_active_time > sysdate - 2
and sql_text like '%REG.CODE, REG.NAME%'
SELECT REG.CODE, REG.NAME FROM V_REGION_LANG REG
WHERE REG.LANGUAGE = PKG_SESSION.LANGUAGE_CODE
AND REG.COUNTRY = :B1 AND REG.REGION_LEVEL = 'STATE' AND REG.CLOSED_TIME IS NULL
;We have " :B1" in query, it stands for plsql parameter "i_country". But we have call to package function "PKG_SESSION.LANGUAGE_CODE" in v$sqlarea query- why wasn't this function replaced with ":B15" for example?
Why plsql parameters are replaced with ":B5" but package functions not?
Does the "PKG_SESSION.LANGUAGE_CODE" in query makes the query slower?

Answer 1

PL/SQL variables by default act as Bind Variables when you use them in SQL. But PACKAGE functions or standalone functions are not bind variables.
If you dont want the package name to appear in the SQL area then you need to change the SQL to use a bind variable.
Something like this
if v_state_flag = 'S' and v_next_query = 'Y' then
      PKG_COMMON.DEBUG ('GET_ADDRESS_LEVEL_LIST.30, fill o_state_list');
      my_value :=  PKG_SESSION.LANGUAGE_CODE;      
      -- kui #postal_flag = 'Y' ja #postalcode on antud, siis lisada klausel
      if v_postalcode_flag = 'S' and i_postal_code is not null then
         open o_state_list for
            select reg.CODE, reg.NAME from V_REGION_LANG reg
            where reg.LANGUAGE = my_value
               and reg.COUNTRY = i_country
               and reg.REGION_LEVEL = 'STATE'
               and reg.CLOSED_TIME is null
               -- kui #postal_flag = 'Y' ja #postalcode on antud, siis lisada klausel
               and reg.CODE in (
               select r.REGION_CODE1 from REGION r, POSTALCODE p
               where r.COUNTRY = p.COUNTRY
               and r.CODE = p.REGION_CODE
               and p.POSTALCODE = i_postal_code
               and p.CLOSED_TIME is null
               );By doing this you execute the package function only once. But when you use it in a SQL directly you execute it for every row.