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pg_operator #目录pg_operator存储关于操作符的信息。详见CREATE OPERATOR和第 35.12 节。
表 45.32. pg_operator 列
| Name | Type | References | Description |
|---|---|---|---|
oprname |
name |
Name of the operator | |
oprnamespace |
oid |
|
The OID of the namespace that contains this operator |
oprowner |
oid |
|
Owner of the operator |
oprkind |
char |
b = infix (“both”), l = prefix (“left”), r = postfix (“right”) |
|
oprcanmerge |
bool |
This operator supports merge joins | |
oprcanhash |
bool |
This operator supports hash joins | |
oprleft |
oid |
|
Type of the left operand |
oprright |
oid |
|
Type of the right operand |
oprresult |
oid |
|
Type of the result |
oprcom |
oid |
|
Commutator of this operator, if any |
oprnegate |
oid |
|
Negator of this operator, if any |
oprcode |
regproc |
|
Function that implements this operator |
oprrest |
regproc |
|
Restriction selectivity estimation function for this operator |
oprjoin |
regproc |
|
Join selectivity estimation function for this operator |
未使用的列包含零。例如,前缀操作符的oprleft为零。
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