yunfengzhou-hub commented on code in PR #114:
URL: https://github.com/apache/flink-ml/pull/114#discussion_r904423389
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flink-ml-lib/src/main/java/org/apache/flink/ml/feature/vectorassembler/VectorAssembler.java:
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@@ -80,24 +82,68 @@ public Table[] transform(Table... inputs) {
return new Table[] {outputTable};
}
- private static class AssemblerFunc implements FlatMapFunction<Row, Row> {
+ private static class AssemblerFunc extends RichFlatMapFunction<Row, Row> {
private final String[] inputCols;
private final String handleInvalid;
+ /** The indices for assembling vectors. */
+ private transient IntArrayList indices;
Review Comment:
Why should we use `IntArrayList`, instead of `List<Integer>` and
`Integer[]`? Would it bring performance improvement compared with these options?
How about implementing it in two loops? In the first loop, we only extract
the vector/numbers, and calculate their total size. Then we allocate the
integer and double arrays according to the calculated size, and assign the
values in the second loop.
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