ALTER [IGNORE] TABLE tbl_name alter_spec [, alter_spec …]
alter_specification:
ADD [COLUMN] create_definition [FIRST | AFTER column_name ]
or ADD INDEX [index_name] (index_col_name,…)
or ADD PRIMARY KEY (index_col_name,…)
or ADD UNIQUE [index_name] (index_col_name,…)
or ALTER [COLUMN] col_name {SET DEFAULT lite
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