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Fix brown-paper-bag bug in commit 0a459cec96d3856f476c2db298c6b52f592894e8.

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RANGE_OFFSET comparisons need to examine the first ORDER BY column,
which isn't necessarily the first column in the incoming tuples.
No idea how this slipped through initial testing.

Per bug #15082 from Zhou Digoal.

Discussion: https://postgr.es/m/151939899974.1461.9411971793110285476@wrigleys.postgresql.org
This commit is contained in:
Tom Lane 2018-02-23 15:11:40 -05:00
parent 8af87f411c
commit 9fe802c818
1 changed files with 6 additions and 4 deletions
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10
src/backend/executor/nodeWindowAgg.c
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@ -1559,6 +1559,7 @@ update_frameheadpos(WindowAggState *winstate)
* reach end of partition, we will leave frameheadpos = end+1 and
* framehead_slot empty.
*/
int sortCol = node->ordColIdx[0];
bool sub,
less;
@ -1593,9 +1594,9 @@ update_frameheadpos(WindowAggState *winstate)
bool headisnull,
currisnull;
headval = slot_getattr(winstate->framehead_slot, 1,
headval = slot_getattr(winstate->framehead_slot, sortCol,
&headisnull);
currval = slot_getattr(winstate->ss.ss_ScanTupleSlot, 1,
currval = slot_getattr(winstate->ss.ss_ScanTupleSlot, sortCol,
&currisnull);
if (headisnull || currisnull)
{
@ -1809,6 +1810,7 @@ update_frametailpos(WindowAggState *winstate)
* necessary. Note that if we reach end of partition, we will
* leave frametailpos = end+1 and frametail_slot empty.
*/
int sortCol = node->ordColIdx[0];
bool sub,
less;
@ -1843,9 +1845,9 @@ update_frametailpos(WindowAggState *winstate)
bool tailisnull,
currisnull;
tailval = slot_getattr(winstate->frametail_slot, 1,
tailval = slot_getattr(winstate->frametail_slot, sortCol,
&tailisnull);
currval = slot_getattr(winstate->ss.ss_ScanTupleSlot, 1,
currval = slot_getattr(winstate->ss.ss_ScanTupleSlot, sortCol,
&currisnull);
if (tailisnull || currisnull)
{