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Postgres support (custom operators) #96

@nene

Description

@nene

Operator

  • CREATE OPERATOR
    • op_name (allow valid operator characters)
    • schema.op_name
    • {FUNCTION | PROCEDURE} = func_name
    • LEFTARG = type
    • RIGHTARG = type
    • COMMUTATOR = op
    • NEGATOR = op
    • RESTRICT = func_name
    • JOIN = func_name
    • HASHES
    • MERGES
  • ALTER OPERATOR
    • ( { left_type | NONE } , right_type )
    • OWNER TO { new_owner | CURRENT_ROLE | CURRENT_USER | SESSION_USER }
    • SET SCHEMA new_schema
    • SET ( ..., ...)
      • RESTRICT = { res_proc | NONE }
      • JOIN = { join_proc | NONE }
      • COMMUTATOR = op
      • NEGATOR = op
      • HASHES
      • MERGES
  • DROP OPERATOR
    • IF EXISTS
    • ( { left_type | NONE } , right_type )
    • multiple names and left/right types
    • CASCADE | RESTRICT

Operator class

Operator family

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