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ts_simple_query_buffers: spell out that bloody sorting logic

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This commit is contained in:
Andrei Zavada 2017-01-26 21:06:57 +02:00
parent 67d4d2c5b6
commit 0f86aeed96
1 changed files with 27 additions and 4 deletions
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31
tests/ts_simple_query_buffers_SUITE.erl
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@ -373,10 +373,33 @@ sort_by(Data, OrderBy) ->
F2 = element(C, R2),
if F1 == F2 ->
undefined; %% let fields of lower precedence decide
F1 == [] andalso F2 /= [] ->
Nul == "nulls first";
F1 /= [] andalso F2 == [] ->
Nul == "nulls last";
(F1 /= []) and (F2 == []) ->
%% null < Value?
case {Nul, Dir} of
{"nulls first", "asc"} ->
false;
{"nulls first", "desc"} ->
true;
{"nulls last", "asc"} ->
true;
{"nulls last", "desc"} ->
false
end;
(F1 == []) and (F2 /= []) ->
%% null > Value?
case {Nul, Dir} of
{"nulls first", "asc"} ->
true;
{"nulls first", "desc"} ->
false;
{"nulls last", "asc"} ->
false;
{"nulls last", "desc"} ->
true
end;
F1 < F2 ->
(Dir == "asc");
F1 > F2 ->