public interface WindowSpecification extends QueryPart
 Window specifications are the syntactic clauses that can be passed to both
 window definitions in WINDOW clauses, as well as to the
 OVER clause of window functions. This makes window
 specifications highly reusable across several queries.
 
 Example: 
 WindowSpecification spec =
 DSL.partitionBy(BOOK.AUTHOR_ID)
    .orderBy(BOOK.ID)
    .rowsBetweenUnboundedPreceding()
    .andCurrentRow();
 
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