final FieldIndex index = new FieldIndex( indexableConstraint.getFieldExtractor(),
indexableConstraint.getIndexingDeclaration(),
indexableConstraint.getIndexEvaluator() );
LeftTupleMemory tupleMemory;
if ( this.conf.isIndexLeftBetaMemory() ) {
tupleMemory = new LeftTupleIndexHashTable( new FieldIndex[]{index} );
} else {
tupleMemory = new LeftTupleList();
}
RightTupleMemory factHandleMemory;