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Fix STRICT check for strict aggregates with NULL ORDER BY columns.

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I (Andres) broke this unintentionally in 69c3936a14, by checking
strictness for all input expressions computed for an aggregate, rather
than just the input for the aggregate transition function.

Reported-By: Ondřej Bouda
Bisected-By: Tom Lane
Diagnosed-By: Andrew Gierth
Discussion: https://postgr.es/m/2a505161-2727-2473-7c46-591ed108ac52@email.cz
Backpatch: 11-, like 69c3936a14
This commit is contained in:
Andres Freund 2018-11-03 14:35:23 -07:00
parent bf4a9562e8
commit fd59b29c87
3 changed files with 23 additions and 1 deletions
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2
src/backend/executor/execExpr.c
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@ -3028,7 +3028,7 @@ ExecBuildAggTrans(AggState *aggstate, AggStatePerPhase phase,
scratch.opcode = EEOP_AGG_STRICT_INPUT_CHECK;
scratch.d.agg_strict_input_check.nulls = strictnulls;
scratch.d.agg_strict_input_check.jumpnull = -1; /* adjust later */
scratch.d.agg_strict_input_check.nargs = numInputs;
scratch.d.agg_strict_input_check.nargs = pertrans->numTransInputs;
ExprEvalPushStep(state, &scratch);
adjust_bailout = lappend_int(adjust_bailout,
state->steps_len - 1);

15
src/test/regress/expected/aggregates.out
View File

@ -2101,3 +2101,18 @@ SELECT dense_rank(x) WITHIN GROUP (ORDER BY x) FROM (VALUES (1),(1),(2),(2),(3),
1
(3 rows)
-- Ensure that the STRICT checks for aggregates does not take NULLness
-- of ORDER BY columns into account. See bug report around
-- 2a505161-2727-2473-7c46-591ed108ac52@email.cz
SELECT min(x ORDER BY y) FROM (VALUES(1, NULL)) AS d(x,y);
min
-----
1
(1 row)
SELECT min(x ORDER BY y) FROM (VALUES(1, 2)) AS d(x,y);
min
-----
1
(1 row)

7
src/test/regress/sql/aggregates.sql
View File

@ -928,3 +928,10 @@ ROLLBACK;
-- test coverage for dense_rank
SELECT dense_rank(x) WITHIN GROUP (ORDER BY x) FROM (VALUES (1),(1),(2),(2),(3),(3)) v(x) GROUP BY (x) ORDER BY 1;
-- Ensure that the STRICT checks for aggregates does not take NULLness
-- of ORDER BY columns into account. See bug report around
-- 2a505161-2727-2473-7c46-591ed108ac52@email.cz
SELECT min(x ORDER BY y) FROM (VALUES(1, NULL)) AS d(x,y);
SELECT min(x ORDER BY y) FROM (VALUES(1, 2)) AS d(x,y);