Why csvlog logs contexts without leading tab?

Had a simple function calling another function, and the final function
was doing raise log.

When I enabled normal stderr logging, with absurdly full
log_line_prefix, I got this:

#v+
a[psql] u[depesz] d[depesz] r[[local]] h[[local]] p[15444] t[2012-09-13 21:49:37 CEST] m[2012-09-13 21:49:37.840 CEST]
i[SELECT]e[00000] c[505238d0.3c54] l[3] s[2012-09-13 21:49:36 CEST] v[2/2] x[0] LOG:  [logged line] 
a[psql] u[depesz] d[depesz] r[[local]] h[[local]] p[15444] t[2012-09-13 21:49:37 CEST] m[2012-09-13 21:49:37.840 CEST]
i[SELECT]e[00000] c[505238d0.3c54] l[4] s[2012-09-13 21:49:36 CEST] v[2/2] x[0] CONTEXT:  SQL statement "SELECT b()" 
    PL/pgSQL function a() line 1 at PERFORM
a[psql] u[depesz] d[depesz] r[[local]] h[[local]] p[15444] t[2012-09-13 21:49:37 CEST] m[2012-09-13 21:49:37.840 CEST]
i[SELECT]e[00000] c[505238d0.3c54] l[5] s[2012-09-13 21:49:36 CEST] v[2/2] x[0] STATEMENT:  select a(); 
a[psql] u[depesz] d[depesz] r[[local]] h[[local]] p[15444] t[2012-09-13 21:49:37 CEST] m[2012-09-13 21:49:37.841 CEST]
i[SELECT]e[00000] c[505238d0.3c54] l[6] s[2012-09-13 21:49:36 CEST] v[2/0] x[0] LOG:  duration: 1.662 ms  statement:
selecta(); 
#v-

same function call, with syslog:

#v+
Sep 13 21:53:31 h3po4 postgres[16156]: [4-1] a[psql] u[depesz] d[depesz] r[[local]] h[[local]] p[16156] t[2012-09-13
21:53:31CEST] m[2012-09-13 21:53:31.852 CEST] i[SELECT] e[00000] c[505239bb.3f1c] l[3] s[2012-09-13 21:53:31 CEST]
v[2/4]x[0] LOG:  [logged line] 
Sep 13 21:53:31 h3po4 postgres[16156]: [4-2] a[psql] u[depesz] d[depesz] r[[local]] h[[local]] p[16156] t[2012-09-13
21:53:31CEST] m[2012-09-13 21:53:31.852 CEST] i[SELECT] e[00000] c[505239bb.3f1c] l[4] s[2012-09-13 21:53:31 CEST]
v[2/4]x[0] CONTEXT:  SQL statement "SELECT b()" 
Sep 13 21:53:31 h3po4 postgres[16156]: [4-3] #011PL/pgSQL function a() line 1 at PERFORM
Sep 13 21:53:31 h3po4 postgres[16156]: [4-4] a[psql] u[depesz] d[depesz] r[[local]] h[[local]] p[16156] t[2012-09-13
21:53:31CEST] m[2012-09-13 21:53:31.852 CEST] i[SELECT] e[00000] c[505239bb.3f1c] l[5] s[2012-09-13 21:53:31 CEST]
v[2/4]x[0] STATEMENT:  select a(); 
Sep 13 21:53:31 h3po4 postgres[16156]: [5-1] a[psql] u[depesz] d[depesz] r[[local]] h[[local]] p[16156] t[2012-09-13
21:53:31CEST] m[2012-09-13 21:53:31.852 CEST] i[SELECT] e[00000] c[505239bb.3f1c] l[6] s[2012-09-13 21:53:31 CEST]
v[2/0]x[0] LOG:  duration: 1.599 ms  statement: select a(); 
#v-

Please note that the 3rd line in both examples has leading tab - either
literal tab in case of stderr log, or #011 in case of syslog.

But with csvlog, I got something different:

#v+
2012-09-13 21:51:12.642 CEST,"depesz","depesz",15673,"[local]",5052392f.3d39,3,"SELECT",2012-09-13 21:51:11
CEST,2/2,0,LOG,00000,"[loggedline]",,,,,"SQL statement ""SELECT b()"" 
PL/pgSQL function a() line 1 at PERFORM","select a();",,,"psql"
2012-09-13 21:51:12.642 CEST,"depesz","depesz",15673,"[local]",5052392f.3d39,4,"SELECT",2012-09-13 21:51:11
CEST,2/0,0,LOG,00000,"duration:1.561 ms  statement: select a();",,,,,,,,,"psql" 
#v-

There is no leading tab on the 2nd line. Why? Is it intentional, or just
an omission?

Best regards,

depesz

--
The best thing about modern society is how easy it is to avoid contact with it.
                                                             http://depesz.com/