Ying Z created FLINK-18782:
------------------------------
Summary: How to retain the column'name when convert a Table to
DataStream
Key: FLINK-18782
URL: https://issues.apache.org/jira/browse/FLINK-18782
Project: Flink
Issue Type: Bug
Affects Versions: 1.9.1
Reporter: Ying Z
mail:
[http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/How-to-retain-the-column-name-when-convert-a-Table-to-DataStream-td37002.html]
I met some field name errors when try to convert in Table and DataStream.
First, init a datastream and convert to table 'source', register a
tablefunction named 'foo'
{code:java}
val sourceStream = env.socketTextStream("127.0.0.1", 8010)
.map(line => line.toInt)
tableEnv.registerDataStream("source_table", sourceStream, 'a)
class Foo() extends TableFunction[(Int)] {
def eval(col: Int): Unit = collect((col * 10))
}
tableEnv.registerFunction("foo", new Foo)
{code}
Then, use sqlQuery to generate a new table t1 with columns 'a' 'b'
{code:java}
val t1 = tableEnv.sqlQuery(
"""
|SELECT source_table.a, b FROM source_table
|, LATERAL TABLE(foo(a)) as T(b)
|""".stripMargin
)
/*
t1 table schema: root
|-- a: INT
|-- b: INT
*/
println(s"t1 table schema: ${t1.getSchema}")
{code}
When I try to convert 't1' to a datastream then register to a new table(for
some reason) named 't1', the columns changes to 'a' 'f0', not 'a' 'b'
{code:java}
val t1Stream = t1.toAppendStream[Row]
// t1 stream schema: Row(a: Integer, f0: Integer)
println(s"t1 stream schema: ${t1Stream.getType()}")
tableEnv.registerDataStream("t1", t1Stream)
/*
new t1 table schema: root
|-- a: INT
|-- f0: INT
*/
println(s"new t1 table schema: ${tableEnv.scan("t1").getSchema}")
{code}
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