feat(arrow/array): add Resize method to RecordBuilder

arrow/array/record.go

@@ -348,6 +348,34 @@ func (b *RecordBuilder) Reserve(size int) {
 	}
 }
 
+// Resize adjusts the space allocated by all the field builders to n elements.
+// If n is greater than an individual builder Cap(), additional memory will be
+// allocated. If n is smaller, the allocated memory may reduced.
+//
+// As a special case, if n equals to -1, all field builders will be resized
+// to the size of the shortest one.
+func (b *RecordBuilder) Resize(n int) {
+	if n >= 0 {
+		for _, f := range b.fields {
+			f.Resize(n)
+		}
+	} else if n == -1 && len(b.fields) > 0 {
+		minLen := b.fields[0].Len()
+		var resizeNeeded bool
+
+		for _, f := range b.fields[1 : ] {
+			if f.Len() < minLen {
+				resizeNeeded = true
+				minLen = f.Len()
+			}
+		}
+
+		if resizeNeeded {
+			b.Resize(minLen)
+		}
+	}
+}
+
 // NewRecordBatch creates a new record batch from the memory buffers and resets the
 // RecordBuilder so it can be used to build a new record batch.
 //