use list like for building

go/arrow/csv/reader.go

@@ -490,17 +490,13 @@ func (r *Reader) initFieldConverter(bldr array.Builder) func(string) {
 		return func(str string) {
 			r.parseDecimal256(bldr, str, dt.Precision, dt.Scale)
 		}
-	case *arrow.ListType:
-		return func(s string) {
-			r.parseList(bldr, s)
-		}
-	case *arrow.LargeListType:
+	case *arrow.FixedSizeListType:
 		return func(s string) {
-			r.parseLargeList(bldr, s)
+			r.parseFixedSizeList(bldr.(*array.FixedSizeListBuilder), s, int(dt.Len()))
 		}
-	case *arrow.FixedSizeListType:
+	case arrow.ListLikeType:
 		return func(s string) {
-			r.parseFixedSizeList(bldr, s, int(dt.Len()))
+			r.parseListLike(bldr.(array.ListLikeBuilder), s)
 		}
 	case *arrow.BinaryType:
 		return func(s string) {
@@ -804,36 +800,7 @@ func (r *Reader) parseDecimal256(field array.Builder, str string, prec, scale in
 	field.(*array.Decimal256Builder).Append(val)
 }
 
-func (r *Reader) parseList(field array.Builder, str string) {
-	if r.isNull(str) {
-		field.AppendNull()
-		return
-	}
-	if !(strings.HasPrefix(str, "{") && strings.HasSuffix(str, "}")) {
-		r.err = errors.New("invalid list format. should start with '{' and end with '}'")
-		return
-	}
-	str = strings.Trim(str, "{}")
-	listBldr := field.(*array.ListBuilder)
-	listBldr.Append(true)
-	if len(str) == 0 {
-		// we don't want to create the csv reader if we already know the
-		// string is empty
-		return
-	}
-	valueBldr := listBldr.ValueBuilder()
-	reader := csv.NewReader(strings.NewReader(str))
-	items, err := reader.Read()
-	if err != nil {
-		r.err = err
-		return
-	}
-	for _, str := range items {
-		r.initFieldConverter(valueBldr)(str)
-	}
-}
-
-func (r *Reader) parseLargeList(field array.Builder, str string) {
+func (r *Reader) parseListLike(field array.ListLikeBuilder, str string) {
 	if r.isNull(str) {
 		field.AppendNull()
 		return
@@ -843,14 +810,13 @@ func (r *Reader) parseLargeList(field array.Builder, str string) {
 		return
 	}
 	str = strings.Trim(str, "{}")
-	largeListBldr := field.(*array.LargeListBuilder)
-	largeListBldr.Append(true)
+	field.Append(true)
 	if len(str) == 0 {
 		// we don't want to create the csv reader if we already know the
 		// string is empty
 		return
 	}
-	valueBldr := largeListBldr.ValueBuilder()
+	valueBldr := field.ValueBuilder()
 	reader := csv.NewReader(strings.NewReader(str))
 	items, err := reader.Read()
 	if err != nil {
@@ -862,7 +828,7 @@ func (r *Reader) parseLargeList(field array.Builder, str string) {
 	}
 }
 
-func (r *Reader) parseFixedSizeList(field array.Builder, str string, n int) {
+func (r *Reader) parseFixedSizeList(field *array.FixedSizeListBuilder, str string, n int) {
 	if r.isNull(str) {
 		field.AppendNull()
 		return
@@ -872,14 +838,13 @@ func (r *Reader) parseFixedSizeList(field array.Builder, str string, n int) {
 		return
 	}
 	str = strings.Trim(str, "{}")
-	fixedSizeListBldr := field.(*array.FixedSizeListBuilder)
-	fixedSizeListBldr.Append(true)
+	field.Append(true)
 	if len(str) == 0 {
 		// we don't want to create the csv reader if we already know the
 		// string is empty
 		return
 	}
-	valueBldr := fixedSizeListBldr.ValueBuilder()
+	valueBldr := field.ValueBuilder()
 	reader := csv.NewReader(strings.NewReader(str))
 	items, err := reader.Read()
 	if err != nil {