FDW

abbr.	stand for	cn
FDW	Foreign Data Wrapper	外部数据包装器
FT	Foreign Table	外部表

• handler
  • FdwRoutine
    • GetForeignRelSize
    • GetForeignPaths
    • GetForeignPlan
    • GetForeignModifyPath
    • BeginForeignScan
    • EndForeignScan
    • ReScanForeignScan
• validator
  • OPTIONS

SELECT *
FROM information_schema.foreign_data_wrappers

SELECT fdwname, fdwhandler, fdwvalidator
FROM pg_foreign_data_wrapper

• wrappers
• https://github.com/wenerme/wrappers