diff options
Diffstat (limited to 'src/include/fmgr.h')
| -rw-r--r-- | src/include/fmgr.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/include/fmgr.h b/src/include/fmgr.h index 0216965bfc1..5c614e79fe9 100644 --- a/src/include/fmgr.h +++ b/src/include/fmgr.h @@ -133,6 +133,11 @@ extern void fmgr_info_copy(FmgrInfo *dstinfo, FmgrInfo *srcinfo, * caller must still check fcinfo->isnull! Also, if function is strict, * it is caller's responsibility to verify that no null arguments are present * before calling. + * + * Some code performs multiple calls without redoing InitFunctionCallInfoData, + * possibly altering the argument values. This is okay, but be sure to reset + * the fcinfo->isnull flag before each call, since callees are permitted to + * assume that starts out false. */ #define FunctionCallInvoke(fcinfo) ((* (fcinfo)->flinfo->fn_addr) (fcinfo)) |