Current DataTypeDescriptor.comparable() is subset of SQL spec. Enhance it to
fully implement SQL spec
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Key: DERBY-3651
URL: https://issues.apache.org/jira/browse/DERBY-3651
Project: Derby
Issue Type: Improvement
Components: SQL
Reporter: Mamta A. Satoor
Collation functionality was implemented in 10.3 The functionality in 10.3 and
10.4 currently has DataTypeDescriptor.comparable() implement subset of SQL
standard. More info on this can be found in DERBY-2876 and other related task
is DERBY-2875.
The current implementation of comparable requires that collation type *and*
derivation must match for the types to be comparable. According to SQL Standard
9.13, e.g. with non-matching types and one derivation of implicit and one of
none, then the types are comparable.
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