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https://issues.apache.org/jira/browse/PHOENIX-1580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14387235#comment-14387235
]
Alicia Ying Shu commented on PHOENIX-1580:
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[~jamestaylor] Here is the code that using MergeSortTopNResultIterator in
UnionPlan.java that did not work. It returned Null result. I think it is due to
we wrapped the plan with TupleProjector which is not a real table.
public final ResultIterator iterator(final List<? extends SQLCloseable>
dependencies) throws SQLException {
ResultIterator scanner;
ResultIterators iterators;
boolean allowPageFilter = false;
boolean isOrdered = (orderBy != null) &&
!orderBy.getOrderByExpressions().isEmpty();
Integer perScanLimit = !allowPageFilter || isOrdered ? null : limit;
List<PeekingResultIterator> pIterators = new
ArrayList<PeekingResultIterator>();
for (QueryPlan plan : this.getPlans()) {
if (isOrdered) {
iterators = new ParallelIterators(plan, perScanLimit,
parallelIteratorFactory);
scanner = new MergeSortTopNResultIterator(iterators, limit,
orderBy.getOrderByExpressions());
pIterators.add(LookAheadResultIterator.wrap(scanner));
} else {
pIterators.add(LookAheadResultIterator.wrap(plan.iterator()));
}
}
scanner = new ConcatResultIterator(pIterators);
if (isOrdered) { // TopN
int thresholdBytes =
context.getConnection().getQueryServices().getProps().getInt(
QueryServices.SPOOL_THRESHOLD_BYTES_ATTRIB,
QueryServicesOptions.DEFAULT_SPOOL_THRESHOLD_BYTES);
scanner = new OrderedResultIterator(scanner,
orderBy.getOrderByExpressions(), thresholdBytes, limit,
this.getProjector().getEstimatedRowByteSize());
} else if (limit != null) {
scanner = new LimitingResultIterator(scanner, limit);
}
if (context.getSequenceManager().getSequenceCount() > 0) {
scanner = new SequenceResultIterator(scanner,
context.getSequenceManager());
}
return scanner;
}
> Support UNION ALL
> -----------------
>
> Key: PHOENIX-1580
> URL: https://issues.apache.org/jira/browse/PHOENIX-1580
> Project: Phoenix
> Issue Type: Bug
> Reporter: Alicia Ying Shu
> Assignee: Alicia Ying Shu
> Attachments: PHOENIX-1580-grammar.patch, Phoenix-1580-v1.patch,
> phoenix-1580-v1-wipe.patch, phoenix-1580.patch, unionall-wipe.patch
>
>
> Select * from T1
> UNION ALL
> Select * from T2
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