[tarantool-patches] Re: [PATCH] lua: fix decimal comparison with box.NULL

[Vladimir Davydov]

On Tue, Aug 27, 2019 at 03:10:47PM +0300, Serge Petrenko wrote:
> 
> > 27 авг. 2019 г., в 15:04, Vladimir Davydov <vdavydov.dev at gmail.com> написал(а):
> > 
> > On Tue, Aug 27, 2019 at 02:22:09PM +0300, Serge Petrenko wrote:
> >> This problem is similar to the one fixed in commit
> >> 3c6c1cc96a1a510493c21c472565d4063e403ba2 (lua:fix decimal comparison
> >> with nil)
> >> We should handle box.NULL the same way.
> >> 
> >> Closes #4454
> >> ---
> >> https://github.com/tarantool/tarantool/issues/4454
> >> https://github.com/tarantool/tarantool/tree/sp/gh-4454-decimal-cmp-null
> >> 
> >> src/lua/decimal.c         |  3 ++-
> >> test/app/decimal.result   | 30 ++++++++++++++++++++++++++++++
> >> test/app/decimal.test.lua |  8 ++++++++
> >> 3 files changed, 40 insertions(+), 1 deletion(-)
> >> 
> >> diff --git a/src/lua/decimal.c b/src/lua/decimal.c
> >> index 23e50ba68..8905a0b9d 100644
> >> --- a/src/lua/decimal.c
> >> +++ b/src/lua/decimal.c
> >> @@ -235,7 +235,8 @@ static int
> >> ldecimal_eq(struct lua_State *L)
> >> {
> >> 	assert(lua_gettop(L) == 2);
> >> -	if (lua_isnil(L, 1) || lua_isnil(L, 2)) {
> >> +	if (lua_isnil(L, 1) || lua_isnil(L, 2) ||
> >> +	    luaL_isnull(L, 1) || luaL_isnull(L, 2)) {
> >> 		lua_pushboolean(L, false);
> >> 		return 1;
> >> 	}
> >> diff --git a/test/app/decimal.result b/test/app/decimal.result
> >> index 8251e13d8..90d0984b0 100644
> >> --- a/test/app/decimal.result
> >> +++ b/test/app/decimal.result
> >> @@ -248,6 +248,36 @@ a <= nil
> >>  | ---
> >>  | - error: '[string "return a <= nil "]:1: attempt to compare decimal with nil'
> >>  | ...
> >> +-- and with box.NULL
> >> +--
> >> +a == box.NULL
> >> + | ---
> >> + | - false
> >> + | ...
> >> +a ~= box.NULL
> >> + | ---
> >> + | - true
> >> + | ...
> >> +a > box.NULL
> >> + | ---
> >> + | - error: '[string "return a > box.NULL "]:1: expected decimal, number or string as
> >> + |     1 argument'
> >> + | ...
> > 
> > 1 argument?
> 
> 1st argument
> 
> > 
> >> +a < box.NULL
> >> + | ---
> >> + | - error: '[string "return a < box.NULL "]:1: expected decimal, number or string as
> >> + |     2 argument'
> >> + | ...
> > 
> > 2 argument?
> 
> 2nd argument

But in both cases box.NULL is the second argument, isn't it?

Anyway, looks like it's a different issue, because I get the same
confusing error message while trying to compare a decimal with, say,
a string. We can fix it in a separate patch if we need to.

Pushed the patch to the master branch as is.