select
${IF(LEN(col)==0,"*",col)}
from table1 t
${IF(LEN(col)==0,"","group by "+col)}
当我下拉树选择一个值时，不报错，选择两个及以上时会报错，应该咋写呢？
分隔符，需要用逗号
${IF(LEN(col)==0,"","group by "+replace(col,"','",",")}
中间要是逗号，不能用','
${if(len(col)==0,"* --",""} ${replace(col,",",","','")}
${if(len(col)==0,"--","group by "} ${replace(col,",",","','")}
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