Brian Hulette created BEAM-8741:
-----------------------------------
Summary: Queries that attempt to write to pubsub publish time
should fail
Key: BEAM-8741
URL: https://issues.apache.org/jira/browse/BEAM-8741
Project: Beam
Issue Type: Improvement
Components: dsl-sql
Reporter: Brian Hulette
Currently it's possible to perform a query like:
{code:sql}
CREATE TABLE pubsub (
event_timestamp TIMESTAMP,
id VARCHAR
) ...
INSERT INTO pubsub (event_timestamp, id) VALUES (...)
{code}
But when this is executed, the event_timestamp will be dropped, because on read
it will be instead be populated with pubsub's publish time.
We should somehow indicate that this is a VIRTUAL GENERATED column, and is
therefore read-only. Calcite seems to have some support for this concept, see
[ColumnStrategy.java|https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/schema/ColumnStrategy.java].
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