FilterList with MUST_PASS_ONE may lead to redundant cells returned

create 'ns:tbl',{NAME => 'family',VERSIONS => 100}
put 'ns:tbl','row','family:name','John',1000000000000
put 'ns:tbl','row','family:name','Jane',1000000000000
put 'ns:tbl','row','family:name','Gil',1000000000000
put 'ns:tbl','row','family:name','Jane',1000000000000

import org.apache.hadoop.hbase.filter._
import org.apache.hadoop.hbase.util.Bytes
import org.apache.hadoop.hbase.client._
import org.apache.hadoop.hbase.{CellUtil, HBaseConfiguration, TableName}
import scala.collection.mutable._

val config = HBaseConfiguration.create()
config.set("hbase.zookeeper.quorum", "localhost")
config.set("hbase.zookeeper.property.clientPort", "2181")

val connection = ConnectionFactory.createConnection(config)

val logicalOp = FilterList.Operator.MUST_PASS_ONE
val limit = 1
var resultsList = ListBuffer[String]()
for (offset <- 0 to 20 by limit) {
	val table = connection.getTable(TableName.valueOf("ns:tbl"))
	val paginationFilter = new ColumnPaginationFilter(limit,offset)
	val filterList: FilterList = new FilterList(logicalOp,paginationFilter)
	println("@ filterList = "+filterList)
	val results = table.get(new Get(Bytes.toBytes("row")).setFilter(filterList))
	val cells = results.rawCells()
	if (cells != null) {
		for (cell <- cells) {
		  val value = new String(CellUtil.cloneValue(cell))
		  val qualifier = new String(CellUtil.cloneQualifier(cell))
		  val family = new String(CellUtil.cloneFamily(cell))
		  val result = "OFFSET = "+offset+":"+family + "," + qualifier + "," + value + "," + cell.getTimestamp()
		  resultsList.append(result)
		}
	}
}
resultsList.foreach(println)

Limit = 1 & logicalOp = MUST_PASS_ALL:
scala> resultsList.foreach(println)
OFFSET = 0:family,name,Jane,1000000000000

Limit = 1 & logicalOp = MUST_PASS_ONE:
scala> resultsList.foreach(println)
OFFSET = 0:family,name,Jane,1000000000000
OFFSET = 1:family,name,Gil,1000000000000
OFFSET = 2:family,name,Jane,1000000000000
OFFSET = 3:family,name,John,1000000000000

Limit = 2 & logicalOp = MUST_PASS_ALL:
scala> resultsList.foreach(println)
OFFSET = 0:family,name,Jane,1000000000000

Limit = 2 & logicalOp = MUST_PASS_ONE:
scala> resultsList.foreach(println)
OFFSET = 0:family,name,Jane,1000000000000
OFFSET = 2:family,name,Jane,1000000000000