diff --git a/field.go b/field.go
index daddbf010..811786def 100644
--- a/field.go
+++ b/field.go
@@ -717,8 +717,25 @@ func (f *Field) loadMeta() error {
 		}
 	}
 
-	min := pql.NewDecimal(pb.Min.Value, pb.Min.Scale)
-	max := pql.NewDecimal(pb.Max.Value, pb.Max.Scale)
+	// Since pb.Min and pb.Max were changed to pql.Decimal,
+	// and since they now have a different protobuf field
+	// number, an existing meta file may have values in the
+	// old min/max fields which need to be converted to
+	// pql.Decimal.
+	// TODO: we can remove the OldMin/OldMax once we're
+	// confident no one is still using the older version.
+	var min pql.Decimal
+	if pb.Min != nil {
+		min = pql.NewDecimal(pb.Min.Value, pb.Min.Scale)
+	} else {
+		min = pql.NewDecimal(pb.OldMin, 0)
+	}
+	var max pql.Decimal
+	if pb.Max != nil {
+		max = pql.NewDecimal(pb.Max.Value, pb.Max.Scale)
+	} else {
+		max = pql.NewDecimal(pb.OldMax, 0)
+	}
 
 	// Initialize "base" to "min" when upgrading from v1 BSI format.
 	if pb.BitDepth == 0 {
diff --git a/internal/private.pb.go b/internal/private.pb.go
index e0ad9ea0c..c78b91ff5 100644
--- a/internal/private.pb.go
+++ b/internal/private.pb.go
@@ -82,6 +82,8 @@ type FieldOptions struct {
 	CacheType            string   `protobuf:"bytes,3,opt,name=CacheType,proto3" json:"CacheType,omitempty"`
 	CacheSize            uint32   `protobuf:"varint,4,opt,name=CacheSize,proto3" json:"CacheSize,omitempty"`
 	TimeQuantum          string   `protobuf:"bytes,5,opt,name=TimeQuantum,proto3" json:"TimeQuantum,omitempty"`
+	OldMin               int64    `protobuf:"varint,9,opt,name=OldMin,proto3" json:"OldMin,omitempty"`
+	OldMax               int64    `protobuf:"varint,10,opt,name=OldMax,proto3" json:"OldMax,omitempty"`
 	Keys                 bool     `protobuf:"varint,11,opt,name=Keys,proto3" json:"Keys,omitempty"`
 	NoStandardView       bool     `protobuf:"varint,12,opt,name=NoStandardView,proto3" json:"NoStandardView,omitempty"`
 	Base                 int64    `protobuf:"varint,13,opt,name=Base,proto3" json:"Base,omitempty"`
@@ -156,6 +158,20 @@ func (m *FieldOptions) GetTimeQuantum() string {
 	return ""
 }
 
+func (m *FieldOptions) GetOldMin() int64 {
+	if m != nil {
+		return m.OldMin
+	}
+	return 0
+}
+
+func (m *FieldOptions) GetOldMax() int64 {
+	if m != nil {
+		return m.OldMax
+	}
+	return 0
+}
+
 func (m *FieldOptions) GetKeys() bool {
 	if m != nil {
 		return m.Keys
@@ -2213,87 +2229,89 @@ func init() {
 func init() { proto.RegisterFile("private.proto", fileDescriptor_d2a91b51c7bdc125) }
 
 var fileDescriptor_d2a91b51c7bdc125 = []byte{
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+	0x28, 0xbc, 0x0b, 0x78, 0x41, 0x13, 0x84, 0xc2, 0xca, 0xfd, 0x38, 0x11, 0xc1, 0xf3, 0x08, 0x8b,
+	0xe0, 0x75, 0x31, 0xa8, 0x0a, 0x46, 0xde, 0x07, 0x57, 0x85, 0xb4, 0xd6, 0x73, 0xfa, 0xed, 0xdb,
+	0x6b, 0x9b, 0xb6, 0x8e, 0x9b, 0x03, 0xe1, 0x07, 0x13, 0x1e, 0x32, 0xc5, 0x45, 0x21, 0x3e, 0xf3,
+	0xc8, 0x62, 0x21, 0x3e, 0xa3, 0x14, 0x56, 0x87, 0x93, 0x69, 0x9c, 0x48, 0x26, 0xd2, 0x69, 0x1c,
+	0xa5, 0x82, 0x74, 0xc1, 0xdd, 0x49, 0x12, 0xcf, 0x41, 0xb3, 0xea, 0x48, 0x7f, 0x80, 0xee, 0x56,
+	0x18, 0xfb, 0x47, 0x03, 0x2e, 0x39, 0x13, 0xdf, 0x67, 0x22, 0x95, 0xca, 0x77, 0xed, 0x9e, 0x96,
+	0xd3, 0x84, 0x42, 0xb1, 0xde, 0x5e, 0x4d, 0xa3, 0x48, 0xa8, 0xbc, 0x60, 0xd6, 0x74, 0x79, 0xf0,
+	0x8c, 0xb1, 0x1f, 0xf2, 0x64, 0x8c, 0x35, 0xad, 0x33, 0x4d, 0x28, 0x14, 0x2d, 0x61, 0x1f, 0xd4,
+	0x99, 0x26, 0xe8, 0x10, 0xd6, 0x4a, 0xf6, 0x8d, 0x9b, 0xeb, 0xd0, 0x60, 0xf1, 0x8b, 0xe1, 0x20,
+	0xf5, 0x9c, 0x9e, 0xdb, 0xaf, 0x33, 0x43, 0x61, 0xc3, 0xc4, 0x61, 0x36, 0x89, 0x14, 0xab, 0x86,
+	0xac, 0x02, 0xa0, 0x57, 0x61, 0x09, 0xbb, 0x47, 0x45, 0x59, 0xdc, 0x55, 0x47, 0xfa, 0xa3, 0x03,
+	0xad, 0x5d, 0x3e, 0x43, 0x47, 0x52, 0x72, 0x17, 0x9a, 0xb6, 0xb6, 0x28, 0xd4, 0xbe, 0xfd, 0x5e,
+	0x91, 0xc1, 0x5c, 0x6c, 0xd3, 0xca, 0xec, 0x44, 0x32, 0x39, 0x61, 0xf9, 0x95, 0x6b, 0x5f, 0x40,
+	0xa7, 0xc2, 0x52, 0xf6, 0x8e, 0xc4, 0x89, 0xcd, 0xea, 0x91, 0x38, 0x51, 0xb1, 0x1e, 0xf3, 0x30,
+	0x13, 0x98, 0xab, 0x3a, 0xd3, 0xc4, 0xe7, 0xb5, 0x4f, 0x1d, 0xfa, 0x0c, 0xc8, 0x76, 0x22, 0xb8,
+	0x14, 0x68, 0x64, 0x57, 0xa4, 0x29, 0x7f, 0x2e, 0xce, 0xca, 0xb8, 0x5b, 0xce, 0x78, 0x9e, 0xdd,
+	0x5a, 0x29, 0xbb, 0xf4, 0x26, 0x90, 0x81, 0x08, 0x85, 0x14, 0x66, 0xba, 0xff, 0x41, 0x2f, 0x1d,
+	0x59, 0x1f, 0xce, 0x96, 0x25, 0x37, 0xa0, 0xae, 0x56, 0x05, 0x1a, 0x6b, 0xdf, 0xbe, 0x58, 0xe4,
+	0x29, 0xdf, 0x22, 0x0c, 0x05, 0x68, 0x68, 0x95, 0xa2, 0x97, 0x6f, 0x18, 0x58, 0xa5, 0x95, 0x6e,
+	0x1a, 0x53, 0x2e, 0x9a, 0x5a, 0x2f, 0x4c, 0x95, 0xd7, 0x8c, 0xb1, 0x76, 0xcf, 0x86, 0x7b, 0x5e,
+	0x6b, 0xd4, 0x87, 0xff, 0x6b, 0x0d, 0x5f, 0x1d, 0xf3, 0x20, 0xe4, 0x07, 0xe1, 0xbf, 0xaa, 0x48,
+	0xc5, 0x71, 0x0f, 0x96, 0xf1, 0xee, 0x70, 0x60, 0x7a, 0xdb, 0x92, 0xf4, 0x3b, 0x28, 0xc6, 0x64,
+	0x8f, 0x4f, 0x84, 0xd1, 0x86, 0xe7, 0x3c, 0xde, 0xda, 0xd9, 0xf1, 0x2a, 0xc3, 0x6a, 0xb4, 0xd4,
+	0xaa, 0x76, 0x95, 0x61, 0x24, 0xe8, 0x1d, 0x68, 0x8c, 0xfc, 0x43, 0x31, 0xe1, 0xe4, 0x43, 0x58,
+	0x46, 0x0f, 0x45, 0x6a, 0x3a, 0xfa, 0xc2, 0x5c, 0xa5, 0x98, 0xe5, 0xd3, 0xd4, 0x44, 0x76, 0xaa,
+	0x4f, 0x1f, 0xc1, 0xb2, 0x31, 0x8c, 0x13, 0xbd, 0xa0, 0xe2, 0x56, 0x86, 0xdc, 0x80, 0x06, 0x3a,
+	0x9b, 0x7a, 0xf5, 0x79, 0xab, 0x88, 0x33, 0xc3, 0xa6, 0x3b, 0xe0, 0x3e, 0x65, 0x43, 0x35, 0xd8,
+	0xe8, 0xb0, 0x35, 0x6a, 0x28, 0xe5, 0xca, 0xd7, 0x71, 0x2a, 0x4d, 0x5a, 0xf1, 0xac, 0xb0, 0xc7,
+	0x71, 0x22, 0x31, 0xa5, 0x1d, 0x86, 0x67, 0x9a, 0x42, 0x7d, 0x2f, 0x1e, 0x0b, 0xb2, 0x0a, 0xb5,
+	0xe1, 0xc0, 0xe8, 0xa8, 0x0d, 0x07, 0xe4, 0x5d, 0x54, 0x6f, 0x32, 0xd9, 0x29, 0x9c, 0x78, 0xca,
+	0x86, 0x0c, 0x0d, 0x5f, 0x87, 0xce, 0x30, 0xdd, 0x8e, 0xe3, 0x64, 0x1c, 0x44, 0x5c, 0xc6, 0x89,
+	0x79, 0xf2, 0xaa, 0x20, 0x8e, 0x96, 0xe4, 0x52, 0x3f, 0x46, 0x2d, 0xa6, 0x09, 0x7a, 0x0f, 0xba,
+	0xca, 0x28, 0x12, 0xb6, 0x3d, 0xd6, 0xa1, 0xa1, 0xb0, 0xdc, 0x09, 0x43, 0x15, 0x1a, 0x6a, 0x65,
+	0x0d, 0xdf, 0x6a, 0x0d, 0x3b, 0xc7, 0x22, 0x92, 0xa5, 0x06, 0x43, 0x1a, 0x15, 0x74, 0x98, 0x26,
+	0x08, 0xd5, 0x01, 0x9a, 0x48, 0x56, 0x8b, 0x48, 0x14, 0xca, 0x90, 0x47, 0x7f, 0x76, 0x00, 0xac,
+	0x43, 0x59, 0x9a, 0x5f, 0x71, 0x16, 0x5f, 0x21, 0x7d, 0xdb, 0x28, 0x66, 0xb8, 0xba, 0x85, 0x94,
+	0xc6, 0x99, 0x6d, 0xa4, 0x8f, 0x8b, 0x46, 0xd2, 0x25, 0xbd, 0x3c, 0xd7, 0x00, 0xda, 0x6a, 0xd1,
+	0x4e, 0x8f, 0xa1, 0x5d, 0xc2, 0x17, 0x34, 0x95, 0xed, 0x92, 0xda, 0xbc, 0x4a, 0xc4, 0x8d, 0x4a,
+	0xdb, 0x2b, 0x0f, 0xa1, 0x5d, 0x82, 0x4f, 0xd5, 0xd8, 0x87, 0x0b, 0xd5, 0xb1, 0xb5, 0xcf, 0xc1,
+	0x3c, 0x4c, 0x03, 0xe8, 0x6c, 0x87, 0x59, 0x2a, 0x45, 0x62, 0xd4, 0xa9, 0x37, 0x44, 0x03, 0x79,
+	0xf1, 0x0a, 0xe0, 0xf4, 0xfa, 0x91, 0xeb, 0xb0, 0xa4, 0xd2, 0xa8, 0xa7, 0xef, 0xf5, 0x1c, 0x6b,
+	0x26, 0x7d, 0x06, 0xcd, 0xad, 0xd1, 0xf0, 0x41, 0x12, 0x67, 0xd3, 0x53, 0x9d, 0xb6, 0x1f, 0x48,
+	0xb5, 0xd2, 0x07, 0x52, 0x57, 0x3f, 0xf6, 0x2e, 0x7e, 0x24, 0xe0, 0xcb, 0xde, 0xd5, 0x2f, 0x7b,
+	0xdd, 0x20, 0x5c, 0xad, 0xeb, 0x35, 0xbd, 0x59, 0xd5, 0xd0, 0x9f, 0x67, 0x3f, 0xd9, 0x37, 0xda,
+	0x2d, 0xde, 0x68, 0xa5, 0x54, 0xaf, 0xbf, 0xff, 0x52, 0xe9, 0x5f, 0x35, 0x58, 0x63, 0x22, 0x0d,
+	0x5e, 0x8a, 0x61, 0x94, 0xca, 0x24, 0xf3, 0xd5, 0x96, 0x50, 0xf7, 0xbf, 0x89, 0x0f, 0x4c, 0xb6,
+	0x5d, 0xa6, 0x89, 0x37, 0xe9, 0x74, 0x72, 0x0b, 0xda, 0xf3, 0x33, 0xfb, 0xba, 0x68, 0x59, 0x84,
+	0xdc, 0x82, 0xe5, 0x51, 0x9c, 0x25, 0x7e, 0xde, 0xbe, 0xa5, 0xb5, 0xaa, 0x3d, 0xd3, 0x6c, 0x66,
+	0xc5, 0xc8, 0x13, 0x20, 0xfb, 0x09, 0x8f, 0xd2, 0x90, 0x2b, 0x67, 0xed, 0xe5, 0xe6, 0xfc, 0x67,
+	0x41, 0x49, 0xa6, 0xa2, 0xe7, 0x94, 0xcb, 0xe4, 0x93, 0xf2, 0x7c, 0x7a, 0xcb, 0xe8, 0xf5, 0xa5,
+	0xaa, 0xd7, 0xa6, 0xe5, 0xcb, 0x73, 0x7c, 0x77, 0xae, 0x53, 0xbd, 0x06, 0x5e, 0xbc, 0x52, 0x5c,
+	0xac, 0xb0, 0x59, 0x55, 0x9a, 0xfe, 0xe4, 0xc0, 0x4a, 0xd9, 0xb3, 0x37, 0xda, 0x0b, 0x79, 0xc1,
+	0x6b, 0x67, 0x7f, 0x77, 0xd8, 0x82, 0xd7, 0x4f, 0xfb, 0xd2, 0x5b, 0x2a, 0x7f, 0x8b, 0x64, 0x70,
+	0x65, 0x41, 0xba, 0xde, 0xc2, 0xa9, 0x1e, 0xb4, 0x1f, 0xf3, 0x44, 0x06, 0x4a, 0xa5, 0x79, 0x68,
+	0x97, 0x58, 0x19, 0xa2, 0x47, 0x70, 0xf5, 0xb5, 0xe6, 0xdb, 0x8e, 0x27, 0x53, 0xd5, 0xe5, 0x6f,
+	0xd1, 0x84, 0x6a, 0x51, 0x27, 0x89, 0x69, 0xbf, 0x16, 0xd3, 0x04, 0xfd, 0x0c, 0x2e, 0x8f, 0x84,
+	0x2c, 0xb5, 0x9e, 0x9d, 0xa1, 0x1e, 0xb8, 0x7b, 0xe2, 0xc5, 0x82, 0x00, 0x15, 0x8b, 0x7e, 0x09,
+	0xde, 0xd3, 0xe9, 0x98, 0x4b, 0x71, 0xae, 0xdb, 0x5b, 0xd0, 0xdc, 0x8f, 0xa7, 0x71, 0x18, 0x3f,
+	0x3f, 0x39, 0x63, 0x97, 0x79, 0xb0, 0xac, 0x5f, 0x25, 0xbd, 0x1c, 0x5b, 0xcc, 0x92, 0xf4, 0xa2,
+	0x1a, 0x53, 0x9f, 0x87, 0x7e, 0x16, 0x2a, 0x37, 0xd4, 0x47, 0x73, 0xba, 0xd5, 0xfd, 0xed, 0xd5,
+	0x86, 0xf3, 0xfb, 0xab, 0x0d, 0xe7, 0x8f, 0x57, 0x1b, 0xce, 0x2f, 0x7f, 0x6e, 0xfc, 0xef, 0xa0,
+	0x81, 0xbf, 0x8c, 0x77, 0xfe, 0x0e, 0x00, 0x00, 0xff, 0xff, 0xa0, 0xbb, 0xce, 0xd0, 0x5b, 0x0e,
+	0x00, 0x00,
 }
 
 func (m *IndexMeta) Marshal() (dAtA []byte, err error) {
@@ -2439,6 +2457,16 @@ func (m *FieldOptions) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 		i--
 		dAtA[i] = 0x58
 	}
+	if m.OldMax != 0 {
+		i = encodeVarintPrivate(dAtA, i, uint64(m.OldMax))
+		i--
+		dAtA[i] = 0x50
+	}
+	if m.OldMin != 0 {
+		i = encodeVarintPrivate(dAtA, i, uint64(m.OldMin))
+		i--
+		dAtA[i] = 0x48
+	}
 	if len(m.Type) > 0 {
 		i -= len(m.Type)
 		copy(dAtA[i:], m.Type)
@@ -4168,6 +4196,12 @@ func (m *FieldOptions) Size() (n int) {
 	if l > 0 {
 		n += 1 + l + sovPrivate(uint64(l))
 	}
+	if m.OldMin != 0 {
+		n += 1 + sovPrivate(uint64(m.OldMin))
+	}
+	if m.OldMax != 0 {
+		n += 1 + sovPrivate(uint64(m.OldMax))
+	}
 	if m.Keys {
 		n += 2
 	}
@@ -5198,6 +5232,44 @@ func (m *FieldOptions) Unmarshal(dAtA []byte) error {
 			}
 			m.Type = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
+		case 9:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field OldMin", wireType)
+			}
+			m.OldMin = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowPrivate
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.OldMin |= int64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 10:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field OldMax", wireType)
+			}
+			m.OldMax = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowPrivate
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.OldMax |= int64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		case 11:
 			if wireType != 0 {
 				return fmt.Errorf("proto: wrong wireType = %d for field Keys", wireType)
diff --git a/internal/private.proto b/internal/private.proto
index 81c72dde6..989428756 100644
--- a/internal/private.proto
+++ b/internal/private.proto
@@ -14,6 +14,8 @@ message FieldOptions {
 	string CacheType = 3;
 	uint32 CacheSize = 4;
 	string TimeQuantum = 5;
+	int64 OldMin = 9;
+	int64 OldMax = 10;
 	bool Keys = 11;
 	bool NoStandardView = 12;
 	int64 Base = 13;