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https://issues.apache.org/jira/browse/FLINK-29039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17754376#comment-17754376
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Hang Ruan commented on FLINK-29039:
-----------------------------------
This bug is the same as https://issues.apache.org/jira/browse/FLINK-25132.
We cannot get the right result when the deserializer reuses the object and the
connector put deserialized records in a collection. This will cause the
collection contains the same object.
> RowData produced by LineBytesInputFormat is reused, but
> DeserializationSchemaAdapter#Reader only shallow copies produced data, thus
> result will always be the last row value
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: FLINK-29039
> URL: https://issues.apache.org/jira/browse/FLINK-29039
> Project: Flink
> Issue Type: Bug
> Components: Connectors / FileSystem
> Affects Versions: 1.15.1
> Environment: This issue was discovered on MacOS Big Sur.
> Reporter: Marco A. Villalobos
> Assignee: Hang Ruan
> Priority: Major
>
> RowData produced by LineBytesInputFormat is reused, but
> DeserializationSchemaAdapter#Reader only shallow copies produced data, thus
> result will always be the last row value.
>
> Given this program:
> {code:java}
> package mvillalobos.bug;
> import org.apache.flink.api.common.RuntimeExecutionMode;
> import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
> import org.apache.flink.table.api.TableResult;
> import org.apache.flink.table.api.bridge.java.StreamTableEnvironment;
> import static org.apache.flink.table.api.Expressions.$;
> public class IsThisABatchSQLBug {
> public static void main(String[] args) {
> final StreamExecutionEnvironment env =
> StreamExecutionEnvironment.getExecutionEnvironment();
> env.setRuntimeMode(RuntimeExecutionMode.BATCH);
> final StreamTableEnvironment tableEnv =
> StreamTableEnvironment.create(env);
> tableEnv.executeSql("CREATE TABLE historical_raw_source_template(\n" +
> " `file.path` STRING NOT NULL METADATA,\n" +
> " `file.name` STRING NOT NULL METADATA,\n" +
> " `file.size` BIGINT NOT NULL METADATA,\n" +
> " `file.modification-time` TIMESTAMP_LTZ(3) NOT NULL
> METADATA,\n" +
> " line STRING\n" +
> " ) WITH (\n" +
> " 'connector' = 'filesystem', \n" +
> " 'format' = 'raw'\n" +
> " );");
> tableEnv.executeSql("CREATE TABLE historical_raw_source\n" +
> " WITH (\n" +
> " 'path' =
> '/Users/minmay/dev/mvillalobos/historical/data'\n" +
> " ) LIKE historical_raw_source_template;"); final
> TableResult output =
> tableEnv.from("historical_raw_source").select($("line")).execute();
> output.print();
> }
> } {code}
> and this sample.csv file in the
> '/Users/minmay/dev/mvillalobos/historical/data' directory:
> {code:java}
> one
> two
> three
> four
> five
> six
> seven
> eight
> nine
> ten {code}
> {{The print results are:}}
> {code:java}
> +----+--------------------------------+
> | +I | ten |
> | +I | ten |
> | +I | ten |
> | +I | ten |
> | +I | ten |
> | +I | ten |
> | +I | ten |
> | +I | ten |
> | +I | ten |
> | +I | ten |
> +----+--------------------------------+
> 10 rows in set {code}
>
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