damccorm opened a new issue, #19656:
URL: https://github.com/apache/beam/issues/19656
Works in sqlline shell:
```
Welcome to Beam SQL 2.14.0-SNAPSHOT (based on sqlline version 1.4.0)
0: BeamSQL> CREATE EXTERNAL TABLE
s1 (id BIGINT) TYPE 'test';
No rows affected (0.507 seconds)
0: BeamSQL> CREATE EXTERNAL TABLE s2
(id BIGINT) TYPE 'test';
No rows affected (0.004 seconds)
0: BeamSQL> SELECT DISTINCT s1.id as lhs,
s2.id as rhs FROM s1 JOIN s2 USING (id);
+---------------------+---------------------+
| lhs
| rhs |
+---------------------+---------------------+
+---------------------+---------------------+
No
rows selected (2.568 seconds)
```
But doesn't work in the test:
```
Schema inputSchema = Schema.of(
Schema.Field.of("id", Schema.FieldType.INT32));
PCollection<Row> i1 = p.apply(Create.of(ImmutableList.<Row>of())
.withCoder(SchemaCoder.of(inputSchema)));
PCollection<Row> i2 = p.apply(Create.of(ImmutableList.<Row>of())
.withCoder(SchemaCoder.of(inputSchema)));
Schema outputSchema = PCollectionTuple
.of("i1", i1)
.and("i2", i2)
.apply(SqlTransform.query("SELECT
DISTINCT s1.id as lhs, s2.id as rhs FROM i1 JOIN i2 USING (id)"))
.getSchema();
assertEquals(ImmutableList.of("lhs",
"rhs"), outputSchema.getFieldNames());
```
Imported from Jira
[BEAM-7609](https://issues.apache.org/jira/browse/BEAM-7609). Original Jira may
contain additional context.
Reported by: kanterov.
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