util: remove useless codes (#46096)

ref #45933

util/slice/slice.go

@@ -39,16 +39,3 @@ func AllOf(s interface{}, p func(int) bool) bool {
 	}
 	return NoneOf(s, np)
 }
-
-// Copy is a deep copy of the slice.
-func Copy[T any](a []*T) []*T {
-	b := make([]*T, len(a))
-	for i, p := range a {
-		if p == nil {
-			continue
-		}
-		v := *p
-		b[i] = &v
-	}
-	return b
-}

util/slice/slice_test.go

@@ -43,19 +43,3 @@ func TestSlice(t *testing.T) {
 		})
 	}
 }
-
-func TestCopy(t *testing.T) {
-	type T int
-	v0, v1, v2, v3 := T(0), T(1), T(2), T(3)
-	s := []*T{&v0, &v1, &v2, &v3, nil}
-	e := Copy(s)
-	require.Equal(t, len(s), len(e))
-	for i := range s {
-		if s[i] == nil {
-			require.Nil(t, e[i])
-		} else {
-			require.Equal(t, *s[i], *e[i])
-			require.True(t, s[i] != e[i])
-		}
-	}
-}

util/table-filter/BUILD.bazel

@@ -5,7 +5,6 @@ go_library(
     srcs = [
         "column_filter.go",
         "compat.go",
-        "helper.go",
         "matchers.go",
         "parser.go",
         "table_filter.go",

util/table-filter/column_filter.go

@@ -14,7 +14,10 @@
 
 package filter
 
-import "strings"
+import (
+	"slices"
+	"strings"
+)
 
 // ColumnFilter is a structure to check if a column should be included for processing.
 type ColumnFilter interface {
@@ -43,7 +46,7 @@ func ParseColumnFilter(args []string) (ColumnFilter, error) {
 		}
 	}
 
-	reverse(p.rules)
+	slices.Reverse(p.rules)
 
 	return columnFilter(p.rules), nil
 }

util/table-filter/table_filter.go

@@ -15,6 +15,7 @@
 package filter
 
 import (
+	"slices"
 	"strings"
 )
 
@@ -48,7 +49,7 @@ func Parse(args []string) (Filter, error) {
 		}
 	}
 
-	reverse(p.rules)
+	slices.Reverse(p.rules)
 
 	return tableFilter(p.rules), nil
 }