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https://issues.apache.org/jira/browse/FLINK-27449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17529749#comment-17529749
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Yuan Huang edited comment on FLINK-27449 at 4/29/22 4:00 AM:
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Thank you for your reply. Since it is a bug, I think it needs to be fixed
although it is not urgent. If the community is busy, I am happy to work on it.
was (Author: JIRAUSER281248):
Thank you for your reply. So since it is a bug, I think it needs to be fixed
although it is not urgent. If the community is busy, I am happy to work on it.
> The comment is lost when creating a Table from Datastream and Schema
> --------------------------------------------------------------------
>
> Key: FLINK-27449
> URL: https://issues.apache.org/jira/browse/FLINK-27449
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / API
> Affects Versions: 1.14.4
> Reporter: Yuan Huang
> Priority: Major
> Attachments: test_result.png
>
>
>
> A user reported that the comment was lost when creating a Table from
> Datastream and Schema.
>
> So this test will fail:
> {code:java}
> @Test
> public void test() {
> StreamExecutionEnvironment env =
> StreamExecutionEnvironment.getExecutionEnvironment();
> StreamTableEnvironment tableEnv = StreamTableEnvironment.create(env);
> DataStream<String> dataStream = env.fromElements("Alice", "Bob", "John");
> Schema.Builder builder = Schema.newBuilder();
> builder.column("f0", DataTypes.of(String.class)).withComment("this is a
> comment");
> Table table = tableEnv.fromDataStream(dataStream,
> builder.build()).as("user_name");
> table.getResolvedSchema();
> table.printSchema();
> String expected = "(\n `user_name` STRING COMMENT 'this is a
> comment'\n)";
> Assert.assertEquals(expected, table.getResolvedSchema().toString());
> } {code}
>
> !test_result.png|width=577,height=139!
> I checked that the built schema did contains the comment. However, the
> comment filed of resolved schema in the table is null.
> Is it a bug or just meets our expectations?
>
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