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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.
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