repaire optimizer bug ref #150

[qidi1]

Close: #150

Summary

The optimized sql of the code is not running as expected.
The result of the run

Solution Description

The index optimization bug: It is caused by the index did not check for duplicate columns. Add a column_set to check if a column has already been added.

     if column_name not in column_set:
                    column_set.add(column_name)
                    column_list.append(column_name)

The SQL rewrite bug: It is caused by Oceanbase not applying RewriteMySQLORRule. Add RewriteMySQLORRule to common_rules

common_rules = [
    RewriteSupplementColumnRule(),
    RemoveOrderByInDeleteUpdateRule(),
    RewriteMySQLORRule(),
]

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