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Commit0a8b9d3

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Remove no-longer-needed loop in ExecGather().
Coverity complained quite properly that commitea15e18 had introducedunreachable code into ExecGather(); to wit, it was no longer possible toiterate the final for-loop more or less than once. So remove the for().In passing, clean up a couple of comments, and make better use of a localvariable.
1 parent8f164e1 commit0a8b9d3

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+15
-24
lines changed

1 file changed

+15
-24
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‎src/backend/executor/nodeGather.c‎

Lines changed: 15 additions & 24 deletions
Original file line numberDiff line numberDiff line change
@@ -135,8 +135,8 @@ ExecGather(GatherState *node)
135135
/*
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* Initialize the parallel context and workers on first execution. We do
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* this on first execution rather than during node initialization, as it
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* needs to allocate large dynamic segment, so it is better to doif it is
139-
* really needed.
138+
* needs to allocatealarge dynamic segment, so it is better to doit
139+
*only if it isreally needed.
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*/
141141
if (!node->initialized)
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{
@@ -201,32 +201,23 @@ ExecGather(GatherState *node)
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* any previous tuple returned by a TupleQueueReader; to make sure we
202202
* don't leave a dangling pointer around, clear the working slot first.
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*/
204-
ExecClearTuple(node->funnel_slot);
204+
ExecClearTuple(fslot);
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econtext=node->ps.ps_ExprContext;
206206
ResetExprContext(econtext);
207207

208-
/* Get and return the next tuple, projecting if necessary. */
209-
for (;;)
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{
211-
/*
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* Get next tuple, either from one of our workers, or by running the
213-
* plan ourselves.
214-
*/
215-
slot=gather_getnext(node);
216-
if (TupIsNull(slot))
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returnNULL;
218-
219-
/*
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* form the result tuple using ExecProject(), and return it --- unless
221-
* the projection produces an empty set, in which case we must loop
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* back around for another tuple
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*/
224-
econtext->ecxt_outertuple=slot;
225-
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returnExecProject(node->ps.ps_ProjInfo);
227-
}
208+
/*
209+
* Get next tuple, either from one of our workers, or by running the plan
210+
* ourselves.
211+
*/
212+
slot=gather_getnext(node);
213+
if (TupIsNull(slot))
214+
returnNULL;
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229-
returnslot;
216+
/*
217+
* Form the result tuple using ExecProject(), and return it.
218+
*/
219+
econtext->ecxt_outertuple=slot;
220+
returnExecProject(node->ps.ps_ProjInfo);
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}
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/* ----------------------------------------------------------------

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