Dag H. Wanvik created DERBY-5829:
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Summary: Lift DB2 restrictions on the DEFAULT clause
Key: DERBY-5829
URL: https://issues.apache.org/jira/browse/DERBY-5829
Project: Derby
Issue Type: Sub-task
Components: SQL
Reporter: Dag H. Wanvik
DERBY-118 started out as a request to allow date-time functions values to be
assigned to character columns. This is not standard SQL, but it turns out the
Derby allows such conversions at DML time, e.g. in an INSERT statement.
Investigating this we found that there a re several instances in which Derby is
more restrictive in type conversion at DDL time that at DML time. These
instances can be classifies as
a) legacy restrictions that are DB2 specific, but would be legal SQL if lifted
b) restrictions that are not legal SQL per the standard
This subtask addresses a). The original request falls into category b) and we
decided not to fix those since this would allow users to write non-standard
SQL, notwithstanding that fact the Derby also extends on the standard at DML
time. Ideally, we would restrict those cases to follow the standard as well,
but that woudl cause compatibility concerns.
Furthermore, a related issue is that type checks at DDL time, e.g. that a
character literal is not too long for its column, are performed at DML time.
This is not as per the standard, and we track an improvement in this area as
c) Catch type mismatch of DEFAULT values at DDL time (DERBY-5825)
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