Flatten CASE abbreviations
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
The NVL or COALESCE CASE abbreviations can be nested, but this doesn't add any value or clarity to the query. Hence, we flatten them.
Using Settings.transformPatternsFlattenCaseAbbreviation, the following transformations can be achieved:
-- With Settings.transformPatternsFlattenCaseAbbreviation active, this: SELECT NVL(NVL(a, b), c), COALESCE(NVL(a, b), c, NVL(d, e)) COALESCE(a, COALESCE(b, c, d), e) FROM tab; -- ... is transformed into the equivalent expression: SELECT COALESCE(a, b, c), COALESCE(a, b, c, d, e), COALESCE(a, b, c, d, e) FROM tab;
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