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Support prefix match for full-text search #1151

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Support prefix match for full-text search #1151

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10 changes: 7 additions & 3 deletions src/mongo/db/exec/text.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -103,12 +103,16 @@ unique_ptr<PlanStage> TextStage::buildTextTree(OperationContext* opCtx,

ixparams.bounds.startKey = FTSIndexFormat::getIndexKey(
MAX_WEIGHT, term, _params.indexPrefix, _params.spec.getTextIndexVersion());

string term_end = term;
term_end[term_end.size() - 1]++; // increment last character key code of search term for End-Key
ixparams.bounds.endKey = FTSIndexFormat::getIndexKey(
0, term, _params.indexPrefix, _params.spec.getTextIndexVersion());
ixparams.bounds.boundInclusion = BoundInclusion::kIncludeBothStartAndEndKeys;
MAX_WEIGHT, term_end, _params.indexPrefix, _params.spec.getTextIndexVersion());
ixparams.bounds.endKeyInclusive = false; // End key is not inclusive (endKey is artificially generated)

ixparams.bounds.isSimpleRange = true;
ixparams.descriptor = _params.index;
ixparams.direction = -1;
ixparams.direction = 1;

textScorer->addChild(make_unique<IndexScan>(opCtx, ixparams, ws, nullptr));
}
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