[Bug][Connector-V2] fix NPE when decimal type precision is incompatible for Paimon #9452

hawk9821 · 2025-06-18T01:18:18Z

Purpose of this pull request

source : mysql

CREATE TABLE `product` (
  `id` int NOT NULL AUTO_INCREMENT COMMENT '主键',
  `name` varchar(100) DEFAULT NULL COMMENT '商品名称',
  `price` decimal(4,1) DEFAULT NULL COMMENT '单价',
  PRIMARY KEY (`id`)
)  COMMENT='商品表' ;

insert into product values (1,'product1', 101.1);
insert into product values (2,'product2', 999.9);

sink : paimon flink

CREATE CATALOG paimon WITH (
  'type' = 'paimon',
  'warehouse' = '/tmp/paimon'
);

use catalog `paimon`;

create database if not exists `test`;

CREATE TABLE  `test`.`product` (
  `id` int NOT NULL COMMENT '主键',
  `name` varchar(100)  COMMENT '商品名称',
  `price` decimal(4,2)  COMMENT '单价',
  CONSTRAINT `PK_id` PRIMARY KEY (`id`) NOT ENFORCED
)

conf

env {
  parallelism = 1
  job.mode = "BATCH"
}

source {
  jdbc {
    url = "jdbc:mysql://127.0.0.1:3306/source?connectTimeout=5000"
    driver = "com.mysql.cj.jdbc.Driver"
    connection_check_timeout_sec = 100
    user = "*****"
    password = "******"
    table_path = "source.product"
    split.size = 8096
    plugin_output = "table_info"
  }
}

sink {
  Paimon {
    plugin_input = "table_info"
    schema_save_mode = "RECREATE_SCHEMA"
    catalog_name = "seatunnel_test"
    warehouse = "/tmp/paimon"
    database = "test"
    table = "product"
    generate_sink_sql = true
    schema_save_mode = "CREATE_SCHEMA_WHEN_NOT_EXIST"
    data_save_mode = "APPEND_DATA"
  }
}

Exception before the fix : the exception information is unclear, which is not convenient to locate the problem

Exception in thread "main" org.apache.seatunnel.core.starter.exception.CommandExecuteException: SeaTunnel job executed failed
	at org.apache.seatunnel.core.starter.seatunnel.command.ClientExecuteCommand.execute(ClientExecuteCommand.java:228)
	at org.apache.seatunnel.core.starter.SeaTunnel.run(SeaTunnel.java:40)
	at org.apache.seatunnel.core.starter.seatunnel.SeaTunnelClient.main(SeaTunnelClient.java:40)
Caused by: org.apache.seatunnel.engine.common.exception.SeaTunnelEngineException: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.RuntimeException: table source.product sink throw error
	at org.apache.seatunnel.engine.server.task.flow.SinkFlowLifeCycle.received(SinkFlowLifeCycle.java:302)
	at org.apache.seatunnel.engine.server.task.flow.SinkFlowLifeCycle.received(SinkFlowLifeCycle.java:70)
	at org.apache.seatunnel.engine.server.task.SeaTunnelTransformCollector.collect(SeaTunnelTransformCollector.java:39)
	at org.apache.seatunnel.engine.server.task.SeaTunnelTransformCollector.collect(SeaTunnelTransformCollector.java:27)
	at org.apache.seatunnel.engine.server.task.group.queue.IntermediateBlockingQueue.handleRecord(IntermediateBlockingQueue.java:70)
	at org.apache.seatunnel.engine.server.task.group.queue.IntermediateBlockingQueue.collect(IntermediateBlockingQueue.java:50)
	at org.apache.seatunnel.engine.server.task.flow.IntermediateQueueFlowLifeCycle.collect(IntermediateQueueFlowLifeCycle.java:51)
	at org.apache.seatunnel.engine.server.task.TransformSeaTunnelTask.collect(TransformSeaTunnelTask.java:72)
	at org.apache.seatunnel.engine.server.task.SeaTunnelTask.stateProcess(SeaTunnelTask.java:165)
	at org.apache.seatunnel.engine.server.task.TransformSeaTunnelTask.call(TransformSeaTunnelTask.java:77)
	at org.apache.seatunnel.engine.server.TaskExecutionService$BlockingWorker.run(TaskExecutionService.java:694)
	at org.apache.seatunnel.engine.server.TaskExecutionService$NamedTaskWrapper.run(TaskExecutionService.java:1023)
	at org.apache.seatunnel.api.tracing.MDCRunnable.run(MDCRunnable.java:43)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:750)
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: table source.product sink throw error
	at org.apache.seatunnel.api.sink.multitablesink.MultiTableSinkWriter.abortPrepare(MultiTableSinkWriter.java:309)
	at org.apache.seatunnel.engine.server.task.flow.SinkFlowLifeCycle.received(SinkFlowLifeCycle.java:203)
	... 17 more
Caused by: java.lang.RuntimeException: table source.product sink throw error
	at org.apache.seatunnel.api.sink.multitablesink.MultiTableSinkWriter.subSinkErrorCheck(MultiTableSinkWriter.java:140)
	at org.apache.seatunnel.api.sink.multitablesink.MultiTableSinkWriter.checkQueueRemain(MultiTableSinkWriter.java:358)
	at org.apache.seatunnel.api.sink.multitablesink.MultiTableSinkWriter.abortPrepare(MultiTableSinkWriter.java:289)
	... 18 more
Caused by: java.lang.NullPointerException
	at org.apache.paimon.data.AbstractBinaryWriter.writeDecimal(AbstractBinaryWriter.java:128)
	at org.apache.paimon.data.BinaryRowWriter.writeDecimal(BinaryRowWriter.java:25)
	at org.apache.seatunnel.connectors.seatunnel.paimon.utils.RowConverter.reconvert(RowConverter.java:412)
	at org.apache.seatunnel.connectors.seatunnel.paimon.sink.PaimonSinkWriter.write(PaimonSinkWriter.java:191)
	at org.apache.seatunnel.connectors.seatunnel.paimon.sink.PaimonSinkWriter.write(PaimonSinkWriter.java:71)
	at org.apache.seatunnel.api.sink.multitablesink.MultiTableWriterRunnable.run(MultiTableWriterRunnable.java:67)
	... 6 more

	at org.apache.seatunnel.core.starter.seatunnel.command.ClientExecuteCommand.execute(ClientExecuteCommand.java:220)
	... 2 more

Exception after the fix :

Exception in thread "main" org.apache.seatunnel.core.starter.exception.CommandExecuteException: SeaTunnel job executed failed
	at org.apache.seatunnel.core.starter.seatunnel.command.ClientExecuteCommand.execute(ClientExecuteCommand.java:228)
	at org.apache.seatunnel.core.starter.SeaTunnel.run(SeaTunnel.java:40)
	at org.apache.seatunnel.core.starter.seatunnel.SeaTunnelClient.main(SeaTunnelClient.java:40)
Caused by: org.apache.seatunnel.engine.common.exception.SeaTunnelEngineException: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.RuntimeException: table source.product sink throw error
	at org.apache.seatunnel.engine.server.task.flow.SinkFlowLifeCycle.received(SinkFlowLifeCycle.java:302)
	at org.apache.seatunnel.engine.server.task.flow.SinkFlowLifeCycle.received(SinkFlowLifeCycle.java:70)
	at org.apache.seatunnel.engine.server.task.SeaTunnelTransformCollector.collect(SeaTunnelTransformCollector.java:39)
	at org.apache.seatunnel.engine.server.task.SeaTunnelTransformCollector.collect(SeaTunnelTransformCollector.java:27)
	at org.apache.seatunnel.engine.server.task.group.queue.IntermediateBlockingQueue.handleRecord(IntermediateBlockingQueue.java:70)
	at org.apache.seatunnel.engine.server.task.group.queue.IntermediateBlockingQueue.collect(IntermediateBlockingQueue.java:50)
	at org.apache.seatunnel.engine.server.task.flow.IntermediateQueueFlowLifeCycle.collect(IntermediateQueueFlowLifeCycle.java:51)
	at org.apache.seatunnel.engine.server.task.TransformSeaTunnelTask.collect(TransformSeaTunnelTask.java:72)
	at org.apache.seatunnel.engine.server.task.SeaTunnelTask.stateProcess(SeaTunnelTask.java:165)
	at org.apache.seatunnel.engine.server.task.TransformSeaTunnelTask.call(TransformSeaTunnelTask.java:77)
	at org.apache.seatunnel.engine.server.TaskExecutionService$BlockingWorker.run(TaskExecutionService.java:694)
	at org.apache.seatunnel.engine.server.TaskExecutionService$NamedTaskWrapper.run(TaskExecutionService.java:1023)
	at org.apache.seatunnel.api.tracing.MDCRunnable.run(MDCRunnable.java:43)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:750)
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: table source.product sink throw error
	at org.apache.seatunnel.api.sink.multitablesink.MultiTableSinkWriter.abortPrepare(MultiTableSinkWriter.java:309)
	at org.apache.seatunnel.engine.server.task.flow.SinkFlowLifeCycle.received(SinkFlowLifeCycle.java:203)
	... 17 more
Caused by: java.lang.RuntimeException: table source.product sink throw error
	at org.apache.seatunnel.api.sink.multitablesink.MultiTableSinkWriter.subSinkErrorCheck(MultiTableSinkWriter.java:140)
	at org.apache.seatunnel.api.sink.multitablesink.MultiTableSinkWriter.checkQueueRemain(MultiTableSinkWriter.java:358)
	at org.apache.seatunnel.api.sink.multitablesink.MultiTableSinkWriter.abortPrepare(MultiTableSinkWriter.java:289)
	... 18 more
Caused by: org.apache.seatunnel.connectors.seatunnel.paimon.exception.PaimonConnectorException: ErrorCode:[PAIMON-11], ErrorDescription:[deciaml type precision is incompatible. ] - `price` field value is: 101.1, except filed schema of sink is `price` DECIMAL(4, 1), but the filed in sink table which actual schema is `price` DECIMAL(4, 2) '单价'.Please check schema of sink table.
	at org.apache.seatunnel.connectors.seatunnel.paimon.utils.RowConverter.checkCanWriteWithSchema(RowConverter.java:542)
	at org.apache.seatunnel.connectors.seatunnel.paimon.utils.RowConverter.reconvert(RowConverter.java:392)
	at org.apache.seatunnel.connectors.seatunnel.paimon.sink.PaimonSinkWriter.write(PaimonSinkWriter.java:191)
	at org.apache.seatunnel.connectors.seatunnel.paimon.sink.PaimonSinkWriter.write(PaimonSinkWriter.java:71)
	at org.apache.seatunnel.api.sink.multitablesink.MultiTableWriterRunnable.run(MultiTableWriterRunnable.java:67)
	... 6 more

	at org.apache.seatunnel.core.starter.seatunnel.command.ClientExecuteCommand.execute(ClientExecuteCommand.java:220)
	... 2 more

Does this PR introduce any user-facing change?

How was this patch tested?

Check list

If any new Jar binary package adding in your PR, please add License Notice according
New License Guide
If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs
If you are contributing the connector code, please check that the following files are updated:
1. Update plugin-mapping.properties and add new connector information in it
2. Update the pom file of seatunnel-dist
3. Add ci label in label-scope-conf
4. Add e2e testcase in seatunnel-e2e
5. Update connector plugin_config

…e for Paimon

Hisoka-X · 2025-06-18T02:39:37Z

...n/src/test/java/org/apache/seatunnel/connectors/seatunnel/paimon/utils/RowConverterTest.java

+                        RowConverter.reconvert(data, sourceType, sinkSchema);
+                    } catch (Exception e) {
+                        Assertions.assertEquals(
+                                "ErrorCode:[PAIMON-11], ErrorDescription:[deciaml type precision is incompatible. ] - `f0` field value is: 123.4, except filed schema of sink is `f0` DECIMAL(4, 1), but the filed in sink table which actual schema is `f0` DECIMAL(4, 2).Please check schema of sink table.",


Can we convert the precision of data dynamically before insert it?

yes ,but need to modify the table schema

Copilot

Pull Request Overview

This pull request fixes a bug in the Paimon connector to address a NullPointerException that occurs when the decimal type precision is incompatible. Key changes include:

Updating the RowConverter to validate and handle decimal field values properly.
Adding a dedicated test case in RowConverterTest to verify the new error message.
Introducing a new error code and updating error messages in PaimonConnectorErrorCode.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
seatunnel-connectors-v2/connector-paimon/src/test/java/org/apache/seatunnel/connectors/seatunnel/paimon/utils/RowConverterTest.java	Adds test case for decimal conversions and validates error message content
seatunnel-connectors-v2/connector-paimon/src/main/java/org/apache/seatunnel/connectors/seatunnel/paimon/utils/RowConverter.java	Modifies decimal conversion logic and error message generation to correctly detect incompatible precision
seatunnel-connectors-v2/connector-paimon/src/main/java/org/apache/seatunnel/connectors/seatunnel/paimon/exception/PaimonConnectorErrorCode.java	Introduces a new error code with an associated message for decimal type precision incompatibility

...n/src/test/java/org/apache/seatunnel/connectors/seatunnel/paimon/utils/RowConverterTest.java

...aimon/src/main/java/org/apache/seatunnel/connectors/seatunnel/paimon/utils/RowConverter.java

...ava/org/apache/seatunnel/connectors/seatunnel/paimon/exception/PaimonConnectorErrorCode.java

…che/seatunnel/connectors/seatunnel/paimon/utils/RowConverterTest.java Co-authored-by: Copilot <[email protected]>

…che/seatunnel/connectors/seatunnel/paimon/exception/PaimonConnectorErrorCode.java Co-authored-by: Copilot <[email protected]>

…che/seatunnel/connectors/seatunnel/paimon/utils/RowConverter.java Co-authored-by: Copilot <[email protected]>

…e for Paimon

…le for Paimon (apache#9452)

[Bug][Connector-V2]fix NPE when decimal type precision is incompatibl…

30acb31

…e for Paimon

github-actions bot added connectors-v2 paimon labels Jun 18, 2025

Hisoka-X reviewed Jun 18, 2025

View reviewed changes

nielifeng requested a review from Copilot June 18, 2025 06:12

Copilot AI reviewed Jun 18, 2025

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hawk9821 and others added 4 commits June 19, 2025 16:15

Update seatunnel-connectors-v2/connector-paimon/src/test/java/org/apa…

5d066c6

…che/seatunnel/connectors/seatunnel/paimon/utils/RowConverterTest.java Co-authored-by: Copilot <[email protected]>

Update seatunnel-connectors-v2/connector-paimon/src/main/java/org/apa…

dd12b42

…che/seatunnel/connectors/seatunnel/paimon/exception/PaimonConnectorErrorCode.java Co-authored-by: Copilot <[email protected]>

Update seatunnel-connectors-v2/connector-paimon/src/main/java/org/apa…

5d510f7

…che/seatunnel/connectors/seatunnel/paimon/utils/RowConverter.java Co-authored-by: Copilot <[email protected]>

[Bug][Connector-V2]fix NPE when decimal type precision is incompatibl…

fcd81cc

…e for Paimon

Hisoka-X approved these changes Jun 24, 2025

View reviewed changes

github-actions bot added approved reviewed labels Jun 24, 2025

corgy-w approved these changes Jun 24, 2025

View reviewed changes

corgy-w merged commit 37762c9 into apache:dev Jun 24, 2025
5 checks passed

hawk9821 deleted the paimon_write_decimal_npe branch June 24, 2025 11:06

chncaesar pushed a commit to chncaesar/seatunnel that referenced this pull request Jun 30, 2025

[Bug][Connector-V2] fix NPE when decimal type precision is incompatib…

9de2c27

…le for Paimon (apache#9452)

dybyte pushed a commit to dybyte/seatunnel that referenced this pull request Jul 23, 2025

[Bug][Connector-V2] fix NPE when decimal type precision is incompatib…

be87839

…le for Paimon (apache#9452)

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[Bug][Connector-V2] fix NPE when decimal type precision is incompatible for Paimon #9452

[Bug][Connector-V2] fix NPE when decimal type precision is incompatible for Paimon #9452

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hawk9821 commented Jun 18, 2025

Purpose of this pull request

Does this PR introduce any user-facing change?

How was this patch tested?

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Pull Request Overview

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