fix(postgresql): combine plsql_unreserved_keyword to unreserved_keyword and remove unused rules

Author: LuckyFBB

src/grammar/postgresql/PostgreSqlParser.g4

@@ -4208,7 +4208,7 @@ function_name
     ;
 
 usual_name
-    : type_usual_name
+    : type_function_name
     | colid indirection
     ;
 
@@ -4285,18 +4285,7 @@ role_list
 
 colid
     : identifier
-    | unreserved_keyword
     | col_name_keyword
-    | plsql_unreserved_keyword
-    ;
-
-index_method_choices
-    : identifier
-    ;
-
-exclude_element
-    : opt_definition
-    | (OPEN_PAREN a_expr CLOSE_PAREN) identifier opt_asc_desc? opt_nulls_order?
     ;
 
 index_paramenters
@@ -4305,15 +4294,6 @@ index_paramenters
 
 type_function_name
     : identifier
-    | unreserved_keyword
-    | plsql_unreserved_keyword
-    | type_func_name_keyword
-    ;
-
-type_usual_name
-    : identifier
-    | unreserved_keyword
-    | plsql_unreserved_keyword
     | type_func_name_keyword
     ;
 
@@ -4324,15 +4304,12 @@ nonreservedword_column
 
 nonreservedword
     : identifier
-    | unreserved_keyword
     | col_name_keyword
     | type_func_name_keyword
     ;
 
 collabel
     : identifier
-    | plsql_unreserved_keyword
-    | unreserved_keyword
     | col_name_keyword
     | type_func_name_keyword
     | reserved_keyword
@@ -4345,7 +4322,7 @@ identifier
     | UnicodeQuotedIdentifier
     | plsqlvariablename
     | plsqlidentifier
-    | plsql_unreserved_keyword
+    | unreserved_keyword
     ;
 
 plsqlidentifier
@@ -4654,6 +4631,39 @@ unreserved_keyword
     | KW_YEAR
     | KW_YES
     | KW_ZONE
+    | KW_ALIAS
+    | KW_ASSERT
+    | KW_CONSTANT
+    | KW_DEBUG
+    | KW_DEFAULT
+    | KW_DIAGNOSTICS
+    | KW_DUMP
+    | KW_ELSIF
+    | KW_ERROR
+    | KW_EXCEPTION
+    | KW_EXIT
+    | KW_GET
+    | KW_INFO
+    | KW_IS
+    | KW_LOG
+    | KW_NOTICE
+    | KW_OPEN
+    | KW_PUBLIC
+    | KW_PERFORM
+    | KW_PRINT_STRICT_PARAMS
+    | KW_QUERY
+    | KW_RAISE
+    | KW_RETURN
+    | KW_REVERSE
+    | KW_ROWTYPE
+    | KW_SLICE
+    | KW_SQLSTATE
+    | KW_STACKED
+    | KW_USE_COLUMN
+    | KW_USE_VARIABLE
+    | KW_VARIABLE_CONFLICT
+    | KW_WARNING
+    | KW_OUTER
     ;
 
 col_name_keyword
@@ -4850,7 +4860,6 @@ sharp
 option_value
     : sconst
     | reserved_keyword
-    | plsql_unreserved_keyword
     | unreserved_keyword
     ;
 
@@ -5472,97 +5481,7 @@ opt_exitcond
 
 any_identifier
     : colid
-    | plsql_unreserved_keyword
-    ;
-
-plsql_unreserved_keyword
-    : KW_ABSOLUTE
-    | KW_ALIAS
-    | KW_AND
-    | KW_ARRAY
-    | KW_ASSERT
-    | KW_BACKWARD
-    | KW_CALL
-    | KW_CHAIN
-    | KW_CLOSE
-    | KW_COLLATE
-    //| COLUMN_NAME
-    | KW_COMMIT
-    | KW_CONSTANT
-    | KW_CONSTRAINT
-    //| CONSTRAINT_NAME
-    | KW_CONTINUE
-    | KW_CURRENT
-    | KW_CURSOR
-    //| DATATYPE
-    | KW_DEBUG
-    | KW_DEFAULT
-    //| DETAIL
-    | KW_DIAGNOSTICS
-    | KW_DO
-    | KW_DUMP
-    | KW_ELSIF
-    //| ERRCODE
-    | KW_ERROR
-    | KW_EXCEPTION
-    | KW_EXIT
-    | KW_FETCH
-    | KW_FIRST
-    | KW_FORWARD
-    | KW_GET
-    //| HINT
-
-    //| IMPORT
-    | KW_INFO
-    | KW_INSERT
-    | KW_IS
-    | KW_LAST
-    | KW_LOG
-    //| MESSAGE
-
-    //| MESSAGE_TEXT
-    | KW_MOVE
-    | KW_NEXT
-    | KW_NO
-    | KW_NOTICE
-    | KW_OPEN
-    | KW_OPTION
-    | KW_PERFORM
-    //| PG_CONTEXT
-
-    //| PG_DATATYPE_NAME
-
-    //| PG_EXCEPTION_CONTEXT
-
-    //| PG_EXCEPTION_DETAIL
-
-    //| PG_EXCEPTION_HINT
-    | KW_PRINT_STRICT_PARAMS
-    | KW_PRIOR
-    | KW_QUERY
-    | KW_RAISE
-    | KW_RELATIVE
-    | KW_RESET
-    | KW_RETURN
-    //| RETURNED_SQLSTATE
-    | KW_REVERSE
-    | KW_ROLLBACK
-    //| ROW_COUNT
-    | KW_ROWTYPE
-    | KW_SCHEMA
-    //| SCHEMA_NAME
-    | KW_SCROLL
-    | KW_SET
-    | KW_SLICE
-    | KW_SQLSTATE
-    | KW_STACKED
-    //| TABLE_NAME
-    | KW_TYPE
-    | KW_USE_COLUMN
-    | KW_USE_VARIABLE
-    | KW_VARIABLE_CONFLICT
-    | KW_WARNING
-    | KW_OUTER
+    | unreserved_keyword
     ;
 
 sql_expression