Fix uninitialized variable 'need_recheck' for AO bitmap indexscan
When append-optimized table is scanned using bitmap indexscan, the variable
'need_recheck' is not initialized in BitmapAppendOnlyNext function, then the
value is always 'true'.  This results in unnecessary recheck of the qual
conditions at every tuple.
Fixes GitHub issue
@@ -671,7 +671,7 @@ BitmapAppendOnlyNext(BitmapHeapScanState *node)
for (;;)
{
TBMIterateResult *tbmres = node->tbmres;
- bool need_recheck;
+ bool need_recheck = false;
CHECK_FOR_INTERRUPTS();
