Due to changes in parser, some queries may return general syntax error (message 102) instead of Syntax error at line # (message 156).
Ordering of result sets in Adaptive Server version 15.0 is different unless there is an order by clause in the query.
Query compilation time is increased as query processing engine looks for more ways to optimize the query to run better.
See Query Processing in Adaptive Server version 15.0 for details about query processing in Adaptive Server version 15.0.
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