AddColumns appends more columns to the Columns slice. If a column name is not valid identifier that column gets switched into an expression. AddColumns("a","b") // `a`,`b` AddColumns("a,b","z","c,d") // a,b,`z`,c,d AddColumns("t1.name","t1.sku","price") // `t1`.`name`, `t1`.`sku`,`price`
(cols ...string)
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