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What will happen to data when i replace columns in hive?

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Explorer

I am having external table emp with columns id,name,sal,comm and data's are already available . Now i removed 'comm' column using replace in hive. will data for that column still available ? If it was there won't it create any error while querying that table ? Do we need to reload data again with new set of columns?

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Thank you @Shu