跨数据库支持。列的别名通常不区分大小写，用双引号或反引号引起来才能保证别名大小写不被修改。 #3518
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What kind of change does this PR introduce? (check at least one)
The description of the PR:
如果别名不用双引号或反引号引起来，其值会被修改。PostgreSQL系列的数据库（如GaussDB）默认会将其值改成全大写的，从而导致在Map找不到对应的值。
Other information: