cleanup ignored static analysis (#16767)

internal/s3select/csv/args.go

@@ -76,8 +76,7 @@ func (args *ReaderArgs) UnmarshalXML(d *xml.Decoder, start xml.StartElement) (er
 			return err
 		}
 
-		switch se := t.(type) {
-		case xml.StartElement:
+		if se, ok := t.(xml.StartElement); ok {
 			tagName := se.Name.Local
 			switch tagName {
 			case "AllowQuotedRecordDelimiter":
@@ -158,8 +157,7 @@ func (args *WriterArgs) UnmarshalXML(d *xml.Decoder, start xml.StartElement) err
 			return err
 		}
 
-		switch se := t.(type) {
-		case xml.StartElement:
+		if se, ok := t.(xml.StartElement); ok {
 			var s string
 			if err = d.DecodeElement(&s, &se); err != nil {
 				return err

internal/s3select/sql/value_test.go

@@ -28,9 +28,7 @@ import (
 // valueBuilders contains one constructor for each value type.
 // Values should match if type is the same.
 var valueBuilders = []func() *Value{
-	func() *Value {
-		return FromNull()
-	},
+	FromNull,
 	func() *Value {
 		return FromBool(true)
 	},
@@ -58,9 +56,7 @@ var valueBuilders = []func() *Value{
 // altValueBuilders contains one constructor for each value type.
 // Values are zero values and should NOT match the values in valueBuilders, except Null type.
 var altValueBuilders = []func() *Value{
-	func() *Value {
-		return FromNull()
-	},
+	FromNull,
 	func() *Value {
 		return FromBool(false)
 	},