The JIRA issue DERBY-264 is for documenting the updates to the ORDER BY clause which allows expressions ( DERBY-134 ). The comments on DERBY-264 show some examples, but I need additional help understanding what needs to be documented:
1. The type of expressions that are allowed. My impression is that they are the Boolean expressions (as opposed to TableExpressions or SelectExpressions)? 2. I need to understand how the Syntax for ORDER BY should appear. Should it just be "Expressions" added immediately after ColumnPosition (in both places in the Syntax? Or should it be specific type of expression (TableExpression, SelectExpression, Boolean Expression). Are there limitations as to the types of expressions allowed? Boolean, concatenation? 3. Description of the expressions allowed (will appear below the syntax) This will depend on what type of expressions are allowed, but one thing that the other parameters mention is if the column needs to be in the select list. I need help describing the expressions parameter. 4. Whatever type of expressions are allowed, that topic in the Derby Ref Guide needs to be updated too. Are there any limitations for ORDER BY? For example, the Boolean expressions topic mentions that there are limitations with check constraints. Thanks! -- Laura Stewart
