presto-hive/src/main/java/io/prestosql/plugin/hive/coercions/FloatToDoubleCoercer.java/FloatToDoubleCoercer/applyCoercedValue
class FloatToDoubleCoercer:    @Override
    protected void applyCoercedValue(BlockBuilder blockBuilder, Block block, int position)
    {
        DOUBLE.writeDouble(blockBuilder, intBitsToFloat((int) REAL.getLong(block, position)));
    }