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https://issues.apache.org/jira/browse/FLINK-19771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17219728#comment-17219728
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Dylan Forciea commented on FLINK-19771:
---------------------------------------
I wouldn't mind taking this one on... but I would have a question about adding
unit tests for this bug. Digging in, I don't see anything that directly tests
out the {{PostgresRowConverter}}. It looks like the existing tests only test
the dialect itself, and otherwise just uses Derby.
Should a unit test for {{PostgresRowConverter}} be added? Or did I miss seeing
an end to end test that spins up a postgres container to perform validation?
> NullPointerException when accessing null array from postgres in JDBC Connector
> ------------------------------------------------------------------------------
>
> Key: FLINK-19771
> URL: https://issues.apache.org/jira/browse/FLINK-19771
> Project: Flink
> Issue Type: Bug
> Components: Connectors / JDBC
> Affects Versions: 1.11.2
> Reporter: Dylan Forciea
> Priority: Major
>
> When trying to utilize the JDBC Connector for Postgres, I tried to read in a
> text array. When a row that was null was attempted to be read in, the
> connector threw an exception and execution stopped. It appears looking at the
> source code that if the row is null that it will still attempt to grab the
> contents out:
> [https://github.com/apache/flink/blob/release-1.11.2/flink-connectors/flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/internal/converter/PostgresRowConverter.java#L97]
> The stack trace is as follows:
> {code:java}
> [error] Caused by: java.io.IOException: Couldn't access resultSet
> [error] at
> org.apache.flink.connector.jdbc.table.JdbcRowDataInputFormat.nextRecord(JdbcRowDataInputFormat.java:266)
> [error] at
> org.apache.flink.connector.jdbc.table.JdbcRowDataInputFormat.nextRecord(JdbcRowDataInputFormat.java:57)
> [error] at
> org.apache.flink.streaming.api.functions.source.InputFormatSourceFunction.run(InputFormatSourceFunction.java:91)
> [error] at
> org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:100)
> [error] at
> org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:63)
> [error] at
> org.apache.flink.streaming.runtime.tasks.SourceStreamTask$LegacySourceFunctionThread.run(SourceStreamTask.java:213)
> [error] Caused by: java.lang.NullPointerException
> [error] at
> org.apache.flink.connector.jdbc.internal.converter.PostgresRowConverter.lambda$createPostgresArrayConverter$c06ce9f4$2(PostgresRowConverter.java:97)
> [error] at
> org.apache.flink.connector.jdbc.internal.converter.AbstractJdbcRowConverter.toInternal(AbstractJdbcRowConverter.java:79)
> [error] at
> org.apache.flink.connector.jdbc.table.JdbcRowDataInputFormat.nextRecord(JdbcRowDataInputFormat.java:259)
> [error] ... 5 more {code}
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