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https://issues.apache.org/jira/browse/BEAM-7610?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kirill Kozlov reassigned BEAM-7610:
-----------------------------------
Assignee: (was: Kirill Kozlov)
> SELECT COALESCE(...) isn't inferred as non-nullable field
> ---------------------------------------------------------
>
> Key: BEAM-7610
> URL: https://issues.apache.org/jira/browse/BEAM-7610
> Project: Beam
> Issue Type: Bug
> Components: dsl-sql
> Affects Versions: 2.13.0
> Reporter: Gleb Kanterov
> Priority: Major
>
> In Calcite, Coalesce is described as:
> {code}
> ReturnTypes.cascade(ReturnTypes.LEAST_RESTRICTIVE,
> SqlTypeTransforms.LEAST_NULLABLE)
> {code}
> However, giving non-null constant as an argument doesn't result in a
> non-nullable expression:
> {code}
> 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);
> {code}
> 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.
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