presto-hive/src/main/java/io/prestosql/plugin/hive/HiveCoercionRecordCursor.java/FloatToDoubleCoercer/coerce
class FloatToDoubleCoercer:        @Override
        protected void coerce(RecordCursor delegate, int field)
        {
            setDouble(intBitsToFloat((int) delegate.getLong(field)));
        }