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https://issues.apache.org/jira/browse/PHOENIX-7772?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Palash Chauhan resolved PHOENIX-7772.
-------------------------------------
Resolution: Fixed
> TOTAL_SEGMENTS query leads to NPE when table has index
> -------------------------------------------------------
>
> Key: PHOENIX-7772
> URL: https://issues.apache.org/jira/browse/PHOENIX-7772
> Project: Phoenix
> Issue Type: Bug
> Affects Versions: 5.3.0
> Reporter: Palash Chauhan
> Assignee: Palash Chauhan
> Priority: Major
> Fix For: 5.4.0, 5.3.1
>
>
> SegmentInfoPlan passes null as QueryPlan delegate in its constructor.
> {code:java}
> public SegmentInfoPlan(StatementContext context, FilterableStatement
> statement, TableRef tableRef,
> RowProjector projector, Integer totalSegmentsValue) {
> super(context, statement, tableRef, projector, null, null, null,
> OrderBy.EMPTY_ORDER_BY, null);
> this.totalSegmentsValue = totalSegmentsValue;
> this.sourceTables = ImmutableSet.of(tableRef);
> } {code}
> During TOTAL_SEGMENTS query, in QueryOptimizer when there is an index on the
> table, `dataPlan.isDegenerate()` is called
> {code:java}
> if (
> dataPlan.isApplicable() && (indexes.isEmpty() || dataPlan.isDegenerate()
> || dataPlan.getTableRef().hasDynamicCols() ||
> select.getHint().hasHint(Hint.NO_INDEX))
> ) {
> return Collections.<QueryPlan> singletonList(dataPlan);
> } {code}
> SegmentInfoPlan -> ClientProcessingPlan -> DelegateQueryPlan
> {code:java}
> @Override
> public boolean isDegenerate() {
> return delegate.isDegenerate();
> } {code}
> delegate is null which leads to NPE.
> We need to override isDegenerate and return true so that optimizer can choose
> this plan over any index plan and return early if the table has indexes.
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