在pgsql数据库查询时，仅检查当前选中的库的权限

[peixubin]

pgsql数据库查询模式中，用户发出查询会在表名中带上schemaname，比如“select * from xxx.tb” 。archery在处理类似的查询语句时，会将"xxx"作为数据库名来检查权限，也就是按照mysql模式来处理。

但这种处理方式在 pgsql 中会出错, 因此将 pgsql 加入特例中.

[request-info]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.14%. Comparing base (24f86de) to head (15fd94e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2709   +/-   ##
=======================================
  Coverage   77.13%   77.14%           
=======================================
  Files         117      117           
  Lines       16169    16174    +5     
=======================================
+ Hits        12472    12477    +5     
  Misses       3697     3697           

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