Github user wzhfy commented on the issue:
    This pr has been updated based on all the above comments, changes are as 
    1. Modify analyze syntax a little bit: `identifierSeq` is now non-optional, 
i.e. users must specify column names after `FOR COLUMNS`.
    2. Check column correctness based on case sensitivity.
    3. Deduplicate columns when checking correctness.
    4. Support analyzing columns independently, i.e. when analyzing new 
columns, now we don’t remove stats of columns which are analyzed before.
    5. Rename `BasicColStats` to `ColumnStats`.
    6. Use 3*standard deviation to check ndv result in test cases.
    7. Code refactoring based on comments.

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