presto-hive/src/main/java/io/prestosql/plugin/hive/coercions/DecimalCoercers.java/ShortDecimalToDoubleCoercer/applyCoercedValue
class ShortDecimalToDoubleCoercer:        @Override
        protected void applyCoercedValue(BlockBuilder blockBuilder, Block block, int position)
        {
            toType.writeDouble(blockBuilder,
                    shortDecimalToDouble(fromType.getLong(block, position), rescale));
        }