历史版本。 PostgreSQL 9.1 已结束支持。 2016-10-27. 请参阅 当前版本手册.
45.5. pg_amproc #
目录pg_amproc存储关于访问方法操作符族相关的支持函数。属于一个操作符族的每一个支持函数在这个目录中都有一行。
表 45.5. pg_amproc 列
| Name | Type | References | Description |
|---|---|---|---|
amprocfamily | oid | | The operator family this entry is for |
amproclefttype | oid | | Left-hand input data type of associated operator |
amprocrighttype | oid | | Right-hand input data type of associated operator |
amprocnum | int2 | Support procedure number | |
amproc | regproc | | OID of the procedure |
amproclefttype 和 amprocrighttype 字段的通常解释是，它们标识某个特定支持过程所支持的操作符的左、右输入类型。For some access methods
these match the input data type(s) of the support procedure itself, for
others not. There is a notion of “default” support procedures for
an index, which are those with amproclefttype and
amprocrighttype both equal to the index opclass's
opcintype.