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怎么修改表的列名

请教一个问题,这样一个table,在第三列列名不确定的情况下,应该怎么改第三列的列名呢?试了用元编程来改,结果也不太对
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代码如下:

sql(select = (sqlCol(`date_array),sqlCol(`date_array_p),sqlColAlias(<colNames(tmp_cur_col_table)[2]>, `value)), from = tmp_cur_col_table).eval()

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直接使用rename!函数来修改一个table的列名

t.rename!(data_arraydata_array_p`myname)


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