Description
Currently Decimal64 is using an inner loop to apply the correct scale to each read Long value https://github.com/apache/orc/blob/master/java/core/src/java/org/apache/orc/impl/TreeReaderFactory.java#L1294
A more efficient way would be to apply the scale using a single array access and by multiplying by 10 in the power of (scale - scratchScaleVector[r]).
An extra optimization would be to keep all powers of 10 (up to 18) in a static array and reuse it across runtime instead of calculating each time.
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