damccorm opened a new issue, #19730:
URL: https://github.com/apache/beam/issues/19730
In Calcite, Coalesce is described as:
```
ReturnTypes.cascade(ReturnTypes.LEAST_RESTRICTIVE,
SqlTypeTransforms.LEAST_NULLABLE)
```
However, giving non-null constant as an argument doesn't result in a
non-nullable expression:
```
Schema inputSchema = Schema.of(
Schema.Field.of("name", Schema.FieldType.STRING.withNullable(true)));
PCollection<Row> input = p.apply(Create.of(ImmutableList.<Row>of())
.withCoder(SchemaCoder.of(inputSchema)));
Schema outputSchema = input
.apply(SqlTransform.query("SELECT COALESCE(name, 'unknown')
as name FROM PCOLLECTION"))
.getSchema();
assertEquals(
Schema.builder().addStringField("name").build(),
outputSchema);
```
Not sure if it's a problem in Calcite or Beam SQL.
There are no other functions that can be used to produce a non-nullable
field.
Imported from Jira
[BEAM-7610](https://issues.apache.org/jira/browse/BEAM-7610). Original Jira may
contain additional context.
Reported by: kanterov.
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