diff --git a/weed/data/column_uint64.go b/weed/data/column_uint64.go
new file mode 100644
index 000000000..0629107a5
--- /dev/null
+++ b/weed/data/column_uint64.go
@@ -0,0 +1,32 @@
+package data
+
+import (
+	"encoding/binary"
+	"fmt"
+	"io"
+)
+
+type ColumnUint64 struct {
+}
+
+const SIZE_Uint64 = 8
+
+func (c *ColumnUint64) Read(buf []byte, readerAt io.ReaderAt, offset int64, i int64) uint64 {
+	if n, err := readerAt.ReadAt(buf, offset+i*SIZE_Uint64); n == SIZE_Uint64 && err == nil {
+		return binary.BigEndian.Uint64(buf)
+	}
+	return 0
+}
+
+func WriteUint64s(buf []byte, data []uint64) (err error) {
+	off := 0
+	size := len(data)
+	if len(buf) < size<<3 {
+		return fmt.Errorf("buf too small")
+	}
+	for _, dat := range data {
+		binary.BigEndian.PutUint64(buf[off:], dat)
+		off += SIZE_Uint64
+	}
+	return nil
+}
diff --git a/weed/data/datum.go b/weed/data/datum.go
index 5805b691d..3cdfcd22d 100644
--- a/weed/data/datum.go
+++ b/weed/data/datum.go
@@ -9,6 +9,7 @@ type Datums []Datum
 
 type DUint16 uint16
 type DUint32 uint32
+type DUint64 uint64
 type dNull struct{}
 
 var (
@@ -28,6 +29,9 @@ func NewDUint16(d DUint16) *DUint16 {
 func NewDUint32(d DUint32) *DUint32 {
 	return &d
 }
+func NewDUint64(d DUint64) *DUint64 {
+	return &d
+}
 
 func (d *DUint16) Compare(other Datum) (int, error) {
 	if other == DNull {
@@ -67,3 +71,21 @@ func (d *DUint32) Compare(other Datum) (int, error) {
 	}
 	return 0, nil
 }
+func (d *DUint64) Compare(other Datum) (int, error) {
+	if other == DNull {
+		return 1, nil
+	}
+	thisV := *d
+	var otherV DUint64
+	switch t := other.(type) {
+	case *DUint64:
+		otherV = *t
+	}
+	if thisV < otherV {
+		return -1, nil
+	}
+	if thisV > otherV {
+		return 1, nil
+	}
+	return 0, nil
+}
diff --git a/weed/data/read_test.go b/weed/data/read_test.go
index 83742d675..c51ade813 100644
--- a/weed/data/read_test.go
+++ b/weed/data/read_test.go
@@ -11,27 +11,36 @@ import (
 func TestRead(t *testing.T) {
 	x := make([]uint16, 128)
 	y := make([]uint32, 128)
+	z := make([]uint64, 128)
 
 	for i := range x {
 		x[i] = uint16(i)
 	}
 	for i := range y {
-		y[i] = uint32(i * 32)
+		y[i] = uint32(i * 2)
+	}
+	for i := range z {
+		z[i] = uint64(i * 3)
 	}
 
 	xbuf := make([]byte, len(x)*SIZE_Uint16)
 	ybuf := make([]byte, len(x)*SIZE_Uint32)
+	zbuf := make([]byte, len(x)*SIZE_Uint64)
 
 	WriteUint16s(xbuf, x)
 	WriteUint32s(ybuf, y)
+	WriteUint64s(zbuf, z)
 
 	df := &DataFile{
 		xbuf:      xbuf,
 		ybuf:      ybuf,
+		zbuf:      zbuf,
 		xLen:      len(xbuf),
 		yLen:      len(ybuf),
+		zLen:      len(zbuf),
 		xReaderAt: util.NewBytesReader(xbuf),
 		yReaderAt: util.NewBytesReader(ybuf),
+		zReaderAt: util.NewBytesReader(zbuf),
 	}
 
 	dataLayout := make(map[FieldName]DataLayout)
@@ -43,6 +52,10 @@ func TestRead(t *testing.T) {
 		LayoutType: Uint32,
 		SortType:   Unsorted,
 	}
+	dataLayout["z"] = DataLayout{
+		LayoutType: Uint64,
+		SortType:   Unsorted,
+	}
 
 	rows, err := df.ReadRows("x", dataLayout, Equal, NewDUint16(65))
 	if err != nil {
@@ -72,6 +85,7 @@ const (
 
 	Uint16 LayoutType = 0
 	Uint32            = 1
+	Uint64            = 2
 
 	Unsorted SortType = 0
 	Ascending
@@ -81,10 +95,13 @@ const (
 type DataFile struct {
 	xbuf      []byte
 	ybuf      []byte
+	zbuf      []byte
 	xReaderAt io.ReaderAt
-	xLen      int
 	yReaderAt io.ReaderAt
+	zReaderAt io.ReaderAt
+	xLen      int
 	yLen      int
+	zLen      int
 }
 
 type DataLayout struct {
@@ -101,6 +118,13 @@ func (d *DataFile) ReadRows(field FieldName, layout map[FieldName]DataLayout, op
 			return
 		}
 		err = hydrateRows(d.yReaderAt, d.yLen, layout["y"], rows)
+		if err != nil {
+			return
+		}
+		err = hydrateRows(d.zReaderAt, d.zLen, layout["z"], rows)
+		if err != nil {
+			return
+		}
 	}
 	if field == "y" {
 		rows, err = pushDownReadRows(d.yReaderAt, d.yLen, layout[field], op, operand)
@@ -108,6 +132,13 @@ func (d *DataFile) ReadRows(field FieldName, layout map[FieldName]DataLayout, op
 			return
 		}
 		err = hydrateRows(d.xReaderAt, d.xLen, layout["x"], rows)
+		if err != nil {
+			return
+		}
+		err = hydrateRows(d.zReaderAt, d.zLen, layout["z"], rows)
+		if err != nil {
+			return
+		}
 	}
 	return
 }
@@ -160,6 +191,27 @@ func pushDownReadRows(readerAt io.ReaderAt, dataLen int, layout DataLayout, op O
 			}
 		}
 	}
+	if layout.LayoutType == Uint64 {
+		if layout.SortType == Unsorted {
+			buf := make([]byte, SIZE_Uint64)
+			for i := 0; i < dataLen; i += SIZE_Uint64 {
+				if n, err := readerAt.ReadAt(buf, int64(i)); n == SIZE_Uint64 && err == nil {
+					d := NewDUint64(DUint64(binary.BigEndian.Uint64(buf)))
+					cmp, err := d.Compare(operand)
+					if err != nil {
+						return rows, err
+					}
+					if cmp == 0 && op == Equal {
+						println(2)
+						rows = append(rows, &Row{
+							index:  i / SIZE_Uint64,
+							Datums: []Datum{d},
+						})
+					}
+				}
+			}
+		}
+	}
 	return
 }
 
@@ -190,5 +242,18 @@ func hydrateRows(readerAt io.ReaderAt, dataLen int, layout DataLayout, rows []*R
 			}
 		}
 	}
+	if layout.LayoutType == Uint64 {
+		if layout.SortType == Unsorted {
+			buf := make([]byte, SIZE_Uint64)
+			for _, row := range rows {
+				if n, err := readerAt.ReadAt(buf, int64(row.index)*SIZE_Uint64); n == SIZE_Uint64 && err == nil {
+					t := binary.BigEndian.Uint64(buf)
+					d := NewDUint64(DUint64(t))
+					println(5, "add", t)
+					row.Datums = append(row.Datums, d)
+				}
+			}
+		}
+	}
 	return
 }