Use factorial rather than numeric_fac in create_operator.sql.

These two SQL functions are aliases for the same C function, so this
change has no semantic effect.  However, because we dropped the
numeric_fac alias in HEAD (commit 76f412ab3), operator definitions
based on that one don't port forward, causing problems for cross-version
upgrade tests based on the regression database.

Patch all active back branches to dodge the problem.

Discussion: https://postgr.es/m/449144.1600439950@sss.pgh.pa.us

Author: tglsfdc

src/test/regress/expected/create_operator.out

@@ -16,15 +16,15 @@ CREATE OPERATOR <% (
 );
 CREATE OPERATOR @#@ (
    rightarg = int8,		-- left unary
-   procedure = numeric_fac
+   procedure = factorial
 );
 CREATE OPERATOR #@# (
    leftarg = int8,		-- right unary
-   procedure = numeric_fac
+   procedure = factorial
 );
 CREATE OPERATOR #%# (
    leftarg = int8,		-- right unary
-   procedure = numeric_fac
+   procedure = factorial
 );
 -- Test operator created above
 SELECT point '(1,2)' <% widget '(0,0,3)' AS t,
@@ -40,7 +40,7 @@ ERROR:  operator does not exist: integer ######
 -- => is disallowed now
 CREATE OPERATOR => (
    leftarg = int8,		-- right unary
-   procedure = numeric_fac
+   procedure = factorial
 );
 ERROR:  syntax error at or near "=>"
 LINE 1: CREATE OPERATOR => (
@@ -50,7 +50,7 @@ LINE 1: CREATE OPERATOR => (
 -- this is legal because ! is not allowed in sql ops
 CREATE OPERATOR !=- (
    leftarg = int8,		-- right unary
-   procedure = numeric_fac
+   procedure = factorial
 );
 SELECT 2 !=-;
  ?column? 
@@ -128,23 +128,23 @@ REVOKE USAGE ON SCHEMA schema_op1 FROM regress_rol_op1;
 SET ROLE regress_rol_op1;
 CREATE OPERATOR schema_op1.#*# (
    leftarg = int8,		-- right unary
-   procedure = numeric_fac
+   procedure = factorial
 );
 ERROR:  permission denied for schema schema_op1
 ROLLBACK;
 -- Should fail. SETOF type functions not allowed as argument (testing leftarg)
 BEGIN TRANSACTION;
 CREATE OPERATOR #*# (
    leftarg = SETOF int8,
-   procedure = numeric_fac
+   procedure = factorial
 );
 ERROR:  SETOF type not allowed for operator argument
 ROLLBACK;
 -- Should fail. SETOF type functions not allowed as argument (testing rightarg)
 BEGIN TRANSACTION;
 CREATE OPERATOR #*# (
    rightarg = SETOF int8,
-   procedure = numeric_fac
+   procedure = factorial
 );
 ERROR:  SETOF type not allowed for operator argument
 ROLLBACK;
@@ -168,13 +168,13 @@ ROLLBACK;
 -- Should fail. Invalid attribute
 CREATE OPERATOR #@%# (
    leftarg = int8,		-- right unary
-   procedure = numeric_fac,
+   procedure = factorial,
    invalid_att = int8
 );
 WARNING:  operator attribute "invalid_att" not recognized
 -- Should fail. At least leftarg or rightarg should be mandatorily specified
 CREATE OPERATOR #@%# (
-   procedure = numeric_fac
+   procedure = factorial
 );
 ERROR:  at least one of leftarg or rightarg must be specified
 -- Should fail. Procedure should be mandatorily specified

src/test/regress/sql/create_operator.sql

@@ -19,17 +19,17 @@ CREATE OPERATOR <% (
 
 CREATE OPERATOR @#@ (
    rightarg = int8,		-- left unary
-   procedure = numeric_fac
+   procedure = factorial
 );
 
 CREATE OPERATOR #@# (
    leftarg = int8,		-- right unary
-   procedure = numeric_fac
+   procedure = factorial
 );
 
 CREATE OPERATOR #%# (
    leftarg = int8,		-- right unary
-   procedure = numeric_fac
+   procedure = factorial
 );
 
 -- Test operator created above
@@ -42,7 +42,7 @@ COMMENT ON OPERATOR ###### (int4, NONE) IS 'bad right unary';
 -- => is disallowed now
 CREATE OPERATOR => (
    leftarg = int8,		-- right unary
-   procedure = numeric_fac
+   procedure = factorial
 );
 
 -- lexing of <=, >=, <>, != has a number of edge cases
@@ -51,7 +51,7 @@ CREATE OPERATOR => (
 -- this is legal because ! is not allowed in sql ops
 CREATE OPERATOR !=- (
    leftarg = int8,		-- right unary
-   procedure = numeric_fac
+   procedure = factorial
 );
 SELECT 2 !=-;
 -- make sure lexer returns != as <> even in edge cases
@@ -85,7 +85,7 @@ REVOKE USAGE ON SCHEMA schema_op1 FROM regress_rol_op1;
 SET ROLE regress_rol_op1;
 CREATE OPERATOR schema_op1.#*# (
    leftarg = int8,		-- right unary
-   procedure = numeric_fac
+   procedure = factorial
 );
 ROLLBACK;
 
@@ -94,7 +94,7 @@ ROLLBACK;
 BEGIN TRANSACTION;
 CREATE OPERATOR #*# (
    leftarg = SETOF int8,
-   procedure = numeric_fac
+   procedure = factorial
 );
 ROLLBACK;
 
@@ -103,7 +103,7 @@ ROLLBACK;
 BEGIN TRANSACTION;
 CREATE OPERATOR #*# (
    rightarg = SETOF int8,
-   procedure = numeric_fac
+   procedure = factorial
 );
 ROLLBACK;
 
@@ -129,13 +129,13 @@ ROLLBACK;
 -- Should fail. Invalid attribute
 CREATE OPERATOR #@%# (
    leftarg = int8,		-- right unary
-   procedure = numeric_fac,
+   procedure = factorial,
    invalid_att = int8
 );
 
 -- Should fail. At least leftarg or rightarg should be mandatorily specified
 CREATE OPERATOR #@%# (
-   procedure = numeric_fac
+   procedure = factorial
 );
 
 -- Should fail. Procedure should be mandatorily specified