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Unreachable DECODE clauses

Applies to ✅ Open Source Edition   ✅ Express Edition   ✅ Professional Edition   ✅ Enterprise Edition

When a DECODE functino contains unreachable arguments, we can remove them.

Using Settings.transformPatternsUnreachableDecodeClauses, the following transformations can be achieved:

-- With Settings.transformPatternsUnreachableDecodeClauses active, this:
  DECODE(a, b, 1, c, 2, b, 3),
  DECODE(a, b, 1, c, 2, b, 3, 4)
FROM tab;

-- ... is transformed into the equivalent expression:
  DECODE(a, b, 1, c, 2),
  DECODE(a, b, 1, c, 2, 4)
FROM tab;


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