Wang Guanglei created FLINK-24176:
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Summary: Column alias in Flink-SQL is unsuccessful after
converting Table to DataStream<Row>
Key: FLINK-24176
URL: https://issues.apache.org/jira/browse/FLINK-24176
Project: Flink
Issue Type: Bug
Components: API / DataStream
Affects Versions: 1.12.0
Environment: java version "1.8.0_291"
Flink version : 1.12-csadh1.3.0.0
Flink scala version: 2.12
Reporter: Wang Guanglei
Hi team,
I found an interesting issue while using Flink-SQL. If the group window
function and aggregating operation are used in one SQL statement at the same
time, some column aliases will be unsuccessful after converting the table to
DataStream<Row>.
Following is a part of the code :
{code:java}
//代码占位符
tableEnv.createTemporaryView("my_table", in);
String sqlQuery = "SELECT c as alias_c, sum(a) as sum_a FROM my_table group by
c, TUMBLE(ts, INTERVAL '1' SECOND)";
Table result = tableEnv.sqlQuery(sqlQuery);
System.out.println("Table schema: " + result.getSchema());
DataStream<Row> resultDataStream = tableEnv.toAppendStream(result, Row.class);
final RowTypeInfo type1 = (RowTypeInfo)resultDataStream.getType();
System.out.println("Field names: " + Arrays.toString(type1.getFieldNames()));
{code}
Output:
Table schema: root
|-- *alias_c*: STRING
|-- sum_a: INT
Field names: [*c*, sum_a]
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