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Create Operator Wizard

Create Operator Wizard guides you through the process of creating a new schema operator.

The basic principles of Create Object Wizards in PostgreSQL Maestro are explained in a separate topic. Below you will find a description of wizard steps that are unique for the current object.

 

 

Owner

Defines the owner of the new operator.

 

Comment

The box allows you to set optional text to describe the new operator.

 

Function

Specify the function used to implement this operator.

 

Left operand type

Set the data type of the operator left operand, if any. This option can be omitted for a left-unary operator.

 

Right operand type

Set the data type of the operator right operand, if any. This option can be omitted for a right-unary operator.

 

Commutator

Specify the commutator of the operator.

 

Negator

Set the negator of the operator.

 

Restrict Function

Specify the restriction selectivity estimator function for the operator.

 

Join Function

Define the join selectivity estimator function for the operator.

 

Left Sort Operator

If the operator can support a merge join, the less-than operator that sorts the left-hand data type of the operator.

 

Right Sort Operator

If the operator can support a merge join, the less-than operator that sorts the right-hand data type of the operator.

 

Less Than Operator

If the operator can support a merge join, the less-than operator that compares the input data types of the operator.

 

Greater Than Operator

If the operator can support a merge join, the greater-than operator that compares the input data types of the operator.

 

The Supports Hash Joins and Supports Merge Joins checkboxes indicate that this operator can support a hash join and a merge join respectively.



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