diff --git a/go/base/context.go b/go/base/context.go
index 69cb7dd..94039e3 100644
--- a/go/base/context.go
+++ b/go/base/context.go
@@ -28,23 +28,23 @@ type RowsEstimateMethod string
 
 const (
 	TableStatusRowsEstimate RowsEstimateMethod = "TableStatusRowsEstimate"
-	ExplainRowsEstimate                        = "ExplainRowsEstimate"
-	CountRowsEstimate                          = "CountRowsEstimate"
+	ExplainRowsEstimate     RowsEstimateMethod = "ExplainRowsEstimate"
+	CountRowsEstimate       RowsEstimateMethod = "CountRowsEstimate"
 )
 
 type CutOver int
 
 const (
-	CutOverAtomic  CutOver = iota
-	CutOverTwoStep         = iota
+	CutOverAtomic CutOver = iota
+	CutOverTwoStep
 )
 
 type ThrottleReasonHint string
 
 const (
 	NoThrottleReasonHint                 ThrottleReasonHint = "NoThrottleReasonHint"
-	UserCommandThrottleReasonHint                           = "UserCommandThrottleReasonHint"
-	LeavingHibernationThrottleReasonHint                    = "LeavingHibernationThrottleReasonHint"
+	UserCommandThrottleReasonHint        ThrottleReasonHint = "UserCommandThrottleReasonHint"
+	LeavingHibernationThrottleReasonHint ThrottleReasonHint = "LeavingHibernationThrottleReasonHint"
 )
 
 const (
diff --git a/go/binlog/binlog_dml_event.go b/go/binlog/binlog_dml_event.go
index 4fab87a..2c7aa36 100644
--- a/go/binlog/binlog_dml_event.go
+++ b/go/binlog/binlog_dml_event.go
@@ -7,17 +7,18 @@ package binlog
 
 import (
 	"fmt"
-	"github.com/github/gh-ost/go/sql"
 	"strings"
+
+	"github.com/github/gh-ost/go/sql"
 )
 
 type EventDML string
 
 const (
 	NotDML    EventDML = "NoDML"
-	InsertDML          = "Insert"
-	UpdateDML          = "Update"
-	DeleteDML          = "Delete"
+	InsertDML EventDML = "Insert"
+	UpdateDML EventDML = "Update"
+	DeleteDML EventDML = "Delete"
 )
 
 func ToEventDML(description string) EventDML {
diff --git a/go/sql/builder.go b/go/sql/builder.go
index 251a874..c3a6229 100644
--- a/go/sql/builder.go
+++ b/go/sql/builder.go
@@ -15,11 +15,11 @@ type ValueComparisonSign string
 
 const (
 	LessThanComparisonSign            ValueComparisonSign = "<"
-	LessThanOrEqualsComparisonSign                        = "<="
-	EqualsComparisonSign                                  = "="
-	GreaterThanOrEqualsComparisonSign                     = ">="
-	GreaterThanComparisonSign                             = ">"
-	NotEqualsComparisonSign                               = "!="
+	LessThanOrEqualsComparisonSign    ValueComparisonSign = "<="
+	EqualsComparisonSign              ValueComparisonSign = "="
+	GreaterThanOrEqualsComparisonSign ValueComparisonSign = ">="
+	GreaterThanComparisonSign         ValueComparisonSign = ">"
+	NotEqualsComparisonSign           ValueComparisonSign = "!="
 )
 
 // EscapeName will escape a db/table/column/... name by wrapping with backticks.
diff --git a/go/sql/types.go b/go/sql/types.go
index 9c7a660..ef83819 100644
--- a/go/sql/types.go
+++ b/go/sql/types.go
@@ -15,13 +15,13 @@ import (
 type ColumnType int
 
 const (
-	UnknownColumnType   ColumnType = iota
-	TimestampColumnType            = iota
-	DateTimeColumnType             = iota
-	EnumColumnType                 = iota
-	MediumIntColumnType            = iota
-	JSONColumnType                 = iota
-	FloatColumnType                = iota
+	UnknownColumnType ColumnType = iota
+	TimestampColumnType
+	DateTimeColumnType
+	EnumColumnType
+	MediumIntColumnType
+	JSONColumnType
+	FloatColumnType
 )
 
 const maxMediumintUnsigned int32 = 16777215