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authorHans Bolinder <[email protected]>2014-03-01 19:48:28 +0100
committerHans Bolinder <[email protected]>2014-03-03 08:50:46 +0100
commit28d4b0cfc27826d7b273edd0143c7dc2f14bf86e (patch)
tree2683781505b71e42d224b36b017ee920092b25ad /lib/stdlib
parenta74e66a68f3b4ed590f928b4fd4f0808c6287a32 (diff)
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Fix a qlc bug where filters were erroneously optimized away
Thanks to Sam Bobroff for reporting the bug.
Diffstat (limited to 'lib/stdlib')
-rw-r--r--lib/stdlib/src/qlc_pt.erl11
-rw-r--r--lib/stdlib/test/qlc_SUITE.erl19
2 files changed, 22 insertions, 8 deletions
diff --git a/lib/stdlib/src/qlc_pt.erl b/lib/stdlib/src/qlc_pt.erl
index c26764eb18..b6bb758dfb 100644
--- a/lib/stdlib/src/qlc_pt.erl
+++ b/lib/stdlib/src/qlc_pt.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 2004-2013. All Rights Reserved.
+%% Copyright Ericsson AB 2004-2014. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
@@ -1218,13 +1218,14 @@ lu_skip(ColConstants, FilterData, PatternFrame, PatternVars,
%% column, the filter will not be skipped.
%% (an example: {X=1} <- ..., X =:= 1).
length(D = Cols -- PatternColumns) =:= 1,
- Frame <- SFs,
- begin
+ {{_,Col} = Column, Constants} <- D,
+ %% Check that the following holds for all frames.
+ lists:all(
+ fun(Frame) ->
%% The column is compared/matched against a constant.
%% If there are no more comparisons/matches then
%% the filter can be replaced by the lookup of
%% the constant.
- [{{_,Col} = Column, Constants}] = D,
{VarI, FrameI} = unify_column(Frame, PV, Col, BindFun,
Imported),
VarValues = deref_skip(VarI, FrameI, LookupOp, Imported),
@@ -1253,7 +1254,7 @@ lu_skip(ColConstants, FilterData, PatternFrame, PatternVars,
length(VarValues) =< 1 andalso
(Constants -- LookedUpConstants =:= []) andalso
bindings_is_subset(Frame, F2, Imported)
- end],
+ end, SFs)],
ColFils = family_list(ColFil),
%% The skip tag 'all' means that all filters are covered by the lookup.
%% It does not imply that there is only one generator as is the case
diff --git a/lib/stdlib/test/qlc_SUITE.erl b/lib/stdlib/test/qlc_SUITE.erl
index 2846657c09..37fbb5267b 100644
--- a/lib/stdlib/test/qlc_SUITE.erl
+++ b/lib/stdlib/test/qlc_SUITE.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 2004-2013. All Rights Reserved.
+%% Copyright Ericsson AB 2004-2014. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
@@ -72,7 +72,7 @@
otp_5644/1, otp_5195/1, otp_6038_bug/1, otp_6359/1, otp_6562/1,
otp_6590/1, otp_6673/1, otp_6964/1, otp_7114/1, otp_7238/1,
- otp_7232/1, otp_7552/1, otp_6674/1, otp_7714/1,
+ otp_7232/1, otp_7552/1, otp_6674/1, otp_7714/1, otp_11758/1,
manpage/1,
@@ -142,7 +142,7 @@ groups() ->
{tickets, [],
[otp_5644, otp_5195, otp_6038_bug, otp_6359, otp_6562,
otp_6590, otp_6673, otp_6964, otp_7114, otp_7232,
- otp_7238, otp_7552, otp_6674, otp_7714]},
+ otp_7238, otp_7552, otp_6674, otp_7714, otp_11758]},
{compat, [], [backward, forward]}].
init_per_suite(Config) ->
@@ -6670,6 +6670,19 @@ otp_7714(Config) when is_list(Config) ->
ets:delete(E2)">>],
?line run(Config, Ts).
+otp_11758(doc) ->
+ "OTP-11758. Bug.";
+otp_11758(suite) -> [];
+otp_11758(Config) when is_list(Config) ->
+ Ts = [<<"T = ets:new(r, [{keypos, 2}]),
+ L = [{rrr, xxx, aaa}, {rrr, yyy, bbb}],
+ true = ets:insert(T, L),
+ QH = qlc:q([{rrr, B, C} || {rrr, B, C} <- ets:table(T),
+ (B =:= xxx) or (B =:= yyy) and (C =:= aaa)]),
+ [{rrr,xxx,aaa}] = qlc:e(QH),
+ ets:delete(T)">>],
+ run(Config, Ts).
+
otp_6674(doc) ->
"OTP-6674. match/comparison.";
otp_6674(suite) -> [];