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https://issues.apache.org/jira/browse/FLINK-28591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17568482#comment-17568482
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Andrzej Swatowski commented on FLINK-28591:
-------------------------------------------
Update: it turns out that the bug is caused by having a BigInt field in the
table. When I have changed type of `foo` from `bigint` to `int`, the array of
rows gets serialized correctly.
> Array<Row<...>> is not serialized correctly when BigInt is present
> ------------------------------------------------------------------
>
> Key: FLINK-28591
> URL: https://issues.apache.org/jira/browse/FLINK-28591
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / API, Table SQL / Planner
> Affects Versions: 1.15.0
> Reporter: Andrzej Swatowski
> Priority: Major
>
> When using Table API to insert data into array of rows, the data apparently
> is incorrectly serialized internally, which leads to incorrect serialization
> at the connectors. It happens when one of the table fields is a BIGINT (and
> does not happen, when it is INT).
> E.g., a following table:
> {code:java}
> CREATE TABLE wrongArray (
> foo bigint,
> bar ARRAY<ROW<`foo1` STRING, `foo2` STRING>>
> ) WITH (
> 'connector' = 'filesystem',
> 'path' = 'file://path/to/somewhere',
> 'format' = 'json'
> ) {code}
> along with the following insert:
> {code:java}
> insert into wrongArray (
> SELECT
> 1,
> array[
> ('Field1', 'Value1'),
> ('Field2', 'Value2')
> ]
> FROM (VALUES(1))
> ) {code}
> gets serialized into:
> {code:java}
> {
> "foo":1,
> "bar":[
> {
> "foo1":"Field2",
> "foo2":"Value2"
> },
> {
> "foo1":"Field2",
> "foo2":"Value2"
> }
> ]
> }{code}
> It is easy to spot that `bar` (an Array of Rows with two Strings) consists of
> duplicates of the last row in the array.
> On the other hand, when `foo` is of type `int` instead of `bigint`:
> {code:java}
> CREATE TABLE wrongArray (
> foo int,
> bar ARRAY<ROW<`foo1` STRING, `foo2` STRING>>
> ) WITH (
> 'connector' = 'filesystem',
> 'path' = 'file://path/to/somewhere',
> 'format' = 'json'
> ) {code}
> the previous insert yields correct value:
> {code:java}
> {
> "foo":1,
> "bar":[
> {
> "foo1":"Field1",
> "foo2":"Value1"
> },
> {
> "foo1":"Field2",
> "foo2":"Value2"
> }
> ]
> }{code}
> Bug reproduced in the Flink project:
> [https://github.com/swtwsk/flink-array-row-bug]
> ----
> It is not an error connected with either a specific connector or format. I
> have done a bit of debugging when trying to implement my own format and it
> seems that `BinaryArrayData` holding the row values has wrong data saved in
> its `MemorySegment`, i.e. calling:
> {code:java}
> for (var i = 0; i < array.size(); i++) {
> Object element = arrayDataElementGetter.getElementOrNull(array, i);
> }{code}
> correctly calculates offsets but yields the same result as the data is
> malformed in the array's `MemorySegment`. Such a call can be, e.g., found in
> `flink-json` — to be more specific in
> {color:#e8912d}org.apache.flink.formats.json.RowDataToJsonConverters::createArrayConverter
> {color}(line 241 in 1.15.0 version)
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