pg_amcheck: Use CppAsString2() for relkind and relpersistence in queries

This utility has been using hardcoded values for relkind and
relpersistence in its queries generated.  These queries are switched to
use CppAsString2() instead, with the values fetched directly from the
header of pg_class.  This has the advantage of making the code more
self-documented, as it becomes unnecessary to look at a header for the
meaning of a value.

There should be no functional changes; the queries are generated the
same way as before this commit.

Reviewed-by: Nathan Bossart, Daniel Gustafsson, Álvaro Herrera, Karina
Litskevich
Discussion: https://postgr.es/m/ZxIvemDk0Ob1RGwh@paquier.xyz

Author: michaelpq

src/bin/pg_amcheck/pg_amcheck.c

@@ -16,6 +16,7 @@
 #include <time.h>
 
 #include "catalog/pg_am_d.h"
+#include "catalog/pg_class_d.h"
 #include "catalog/pg_namespace_d.h"
 #include "common/logging.h"
 #include "common/username.h"
@@ -857,7 +858,7 @@ prepare_heap_command(PQExpBuffer sql, RelationInfo *rel, PGconn *conn)
 
 	appendPQExpBuffer(sql,
 					  "\n) v WHERE c.oid = %u "
-					  "AND c.relpersistence != 't'",
+					  "AND c.relpersistence != " CppAsString2(RELPERSISTENCE_TEMP),
 					  rel->reloid);
 }
 
@@ -890,7 +891,7 @@ prepare_btree_command(PQExpBuffer sql, RelationInfo *rel, PGconn *conn)
 						  "\nFROM pg_catalog.pg_class c, pg_catalog.pg_index i "
 						  "WHERE c.oid = %u "
 						  "AND c.oid = i.indexrelid "
-						  "AND c.relpersistence != 't' "
+						  "AND c.relpersistence != " CppAsString2(RELPERSISTENCE_TEMP) " "
 						  "AND i.indisready AND i.indisvalid AND i.indislive",
 						  rel->datinfo->amcheck_schema,
 						  (opts.heapallindexed ? "true" : "false"),
@@ -905,7 +906,7 @@ prepare_btree_command(PQExpBuffer sql, RelationInfo *rel, PGconn *conn)
 						  "\nFROM pg_catalog.pg_class c, pg_catalog.pg_index i "
 						  "WHERE c.oid = %u "
 						  "AND c.oid = i.indexrelid "
-						  "AND c.relpersistence != 't' "
+						  "AND c.relpersistence != " CppAsString2(RELPERSISTENCE_TEMP) " "
 						  "AND i.indisready AND i.indisvalid AND i.indislive",
 						  rel->datinfo->amcheck_schema,
 						  (opts.heapallindexed ? "true" : "false"),
@@ -1952,7 +1953,8 @@ compile_relation_list_one_db(PGconn *conn, SimplePtrList *relations,
 	 * until firing off the amcheck command, as the state of an index may
 	 * change by then.
 	 */
-	appendPQExpBufferStr(&sql, "\nWHERE c.relpersistence != 't'");
+	appendPQExpBufferStr(&sql, "\nWHERE c.relpersistence != "
+						 CppAsString2(RELPERSISTENCE_TEMP));
 	if (opts.excludetbl || opts.excludeidx || opts.excludensp)
 		appendPQExpBufferStr(&sql, "\nAND ep.pattern_id IS NULL");
 
@@ -1972,15 +1974,29 @@ compile_relation_list_one_db(PGconn *conn, SimplePtrList *relations,
 	if (opts.allrel)
 		appendPQExpBuffer(&sql,
 						  " AND c.relam = %u "
-						  "AND c.relkind IN ('r', 'S', 'm', 't') "
+						  "AND c.relkind IN ("
+						  CppAsString2(RELKIND_RELATION) ", "
+						  CppAsString2(RELKIND_SEQUENCE) ", "
+						  CppAsString2(RELKIND_MATVIEW) ", "
+						  CppAsString2(RELKIND_TOASTVALUE) ") "
 						  "AND c.relnamespace != %u",
 						  HEAP_TABLE_AM_OID, PG_TOAST_NAMESPACE);
 	else
 		appendPQExpBuffer(&sql,
 						  " AND c.relam IN (%u, %u)"
-						  "AND c.relkind IN ('r', 'S', 'm', 't', 'i') "
-						  "AND ((c.relam = %u AND c.relkind IN ('r', 'S', 'm', 't')) OR "
-						  "(c.relam = %u AND c.relkind = 'i'))",
+						  "AND c.relkind IN ("
+						  CppAsString2(RELKIND_RELATION) ", "
+						  CppAsString2(RELKIND_SEQUENCE) ", "
+						  CppAsString2(RELKIND_MATVIEW) ", "
+						  CppAsString2(RELKIND_TOASTVALUE) ", "
+						  CppAsString2(RELKIND_INDEX) ") "
+						  "AND ((c.relam = %u AND c.relkind IN ("
+						  CppAsString2(RELKIND_RELATION) ", "
+						  CppAsString2(RELKIND_SEQUENCE) ", "
+						  CppAsString2(RELKIND_MATVIEW) ", "
+						  CppAsString2(RELKIND_TOASTVALUE) ")) OR "
+						  "(c.relam = %u AND c.relkind = "
+						  CppAsString2(RELKIND_INDEX) "))",
 						  HEAP_TABLE_AM_OID, BTREE_AM_OID,
 						  HEAP_TABLE_AM_OID, BTREE_AM_OID);
 
@@ -2007,7 +2023,7 @@ compile_relation_list_one_db(PGconn *conn, SimplePtrList *relations,
 								 "\nAND (t.relname ~ ep.rel_regex OR ep.rel_regex IS NULL)"
 								 "\nAND ep.heap_only"
 								 "\nWHERE ep.pattern_id IS NULL"
-								 "\nAND t.relpersistence != 't'");
+								 "\nAND t.relpersistence != " CppAsString2(RELPERSISTENCE_TEMP));
 		appendPQExpBufferStr(&sql,
 							 "\n)");
 	}
@@ -2026,7 +2042,7 @@ compile_relation_list_one_db(PGconn *conn, SimplePtrList *relations,
 							 "ON r.oid = i.indrelid "
 							 "INNER JOIN pg_catalog.pg_class c "
 							 "ON i.indexrelid = c.oid "
-							 "AND c.relpersistence != 't'");
+							 "AND c.relpersistence != " CppAsString2(RELPERSISTENCE_TEMP));
 		if (opts.excludeidx || opts.excludensp)
 			appendPQExpBufferStr(&sql,
 								 "\nINNER JOIN pg_catalog.pg_namespace n "
@@ -2041,7 +2057,7 @@ compile_relation_list_one_db(PGconn *conn, SimplePtrList *relations,
 								 "\nWHERE true");
 		appendPQExpBuffer(&sql,
 						  " AND c.relam = %u "
-						  "AND c.relkind = 'i'",
+						  "AND c.relkind = " CppAsString2(RELKIND_INDEX),
 						  BTREE_AM_OID);
 		if (opts.no_toast_expansion)
 			appendPQExpBuffer(&sql,
@@ -2065,7 +2081,7 @@ compile_relation_list_one_db(PGconn *conn, SimplePtrList *relations,
 							 "ON t.oid = i.indrelid"
 							 "\nINNER JOIN pg_catalog.pg_class c "
 							 "ON i.indexrelid = c.oid "
-							 "AND c.relpersistence != 't'");
+							 "AND c.relpersistence != " CppAsString2(RELPERSISTENCE_TEMP));
 		if (opts.excludeidx)
 			appendPQExpBufferStr(&sql,
 								 "\nLEFT OUTER JOIN exclude_pat ep "
@@ -2078,7 +2094,7 @@ compile_relation_list_one_db(PGconn *conn, SimplePtrList *relations,
 								 "\nWHERE true");
 		appendPQExpBuffer(&sql,
 						  " AND c.relam = %u"
-						  " AND c.relkind = 'i')",
+						  " AND c.relkind = " CppAsString2(RELKIND_INDEX) ")",
 						  BTREE_AM_OID);
 	}