change wording to allowlist and the likes (#3906)

In the same line as #3904

Change wording to better reflect use and remove words that enforce/maintain bias.

src/backend/distributed/commands/utility_hook.c

@@ -285,7 +285,7 @@ multi_ProcessUtility(PlannedStmt *pstmt,
 		return;
 	}
 
-	/* process SET LOCAL stmts of whitelisted GUCs in multi-stmt xacts */
+	/* process SET LOCAL stmts of allowed GUCs in multi-stmt xacts */
 	if (IsA(parsetree, VariableSetStmt))
 	{
 		VariableSetStmt *setStmt = (VariableSetStmt *) parsetree;

src/backend/distributed/connection/connection_configuration.c

@@ -122,18 +122,18 @@ AddConnParam(const char *keyword, const char *value)
  *
  *   - Not use a uri-prefix such as postgres:// (it must be only keys and values)
  *   - Parse using PQconninfoParse
- *   - Only set keywords contained in the provided whitelist
+ *   - Only set keywords contained in the provided allowedConninfoKeywords
  *
  * This function returns true if all of the above are satisfied, otherwise it
  * returns false. If the provided errmsg pointer is not NULL, it will be set
  * to an appropriate message if the check fails.
  *
- * The provided whitelist must be sorted in a manner usable by bsearch, though
- * this is only validated during assert-enabled builds.
+ * The provided allowedConninfoKeywords must be sorted in a manner usable by bsearch,
+ * though this is only validated during assert-enabled builds.
  */
 bool
-CheckConninfo(const char *conninfo, const char **whitelist,
-			  Size whitelistLength, char **errorMsg)
+CheckConninfo(const char *conninfo, const char **allowedConninfoKeywords,
+			  Size allowedConninfoKeywordsLength, char **errorMsg)
 {
 	PQconninfoOption *option = NULL;
 	char *errorMsgString = NULL;
@@ -173,11 +173,11 @@ CheckConninfo(const char *conninfo, const char **whitelist,
 
 #ifdef USE_ASSERT_CHECKING
 
-	/* verify that the whitelist is in ascending order */
-	for (Size whitelistIdx = 1; whitelistIdx < whitelistLength; whitelistIdx++)
+	/* verify that the allowedConninfoKeywords is in ascending order */
+	for (Size keywordIdx = 1; keywordIdx < allowedConninfoKeywordsLength; keywordIdx++)
 	{
-		const char *prev = whitelist[whitelistIdx - 1];
-		const char *curr = whitelist[whitelistIdx];
+		const char *prev = allowedConninfoKeywords[keywordIdx - 1];
+		const char *curr = allowedConninfoKeywords[keywordIdx];
 
 		AssertArg(strcmp(prev, curr) < 0);
 	}
@@ -190,11 +190,12 @@ CheckConninfo(const char *conninfo, const char **whitelist,
 			continue;
 		}
 
-		void *matchingKeyword = SafeBsearch(&option->keyword, whitelist, whitelistLength,
-											sizeof(char *), pg_qsort_strcmp);
+		void *matchingKeyword = SafeBsearch(&option->keyword, allowedConninfoKeywords,
+											allowedConninfoKeywordsLength, sizeof(char *),
+											pg_qsort_strcmp);
 		if (matchingKeyword == NULL)
 		{
-			/* the whitelist lacks this keyword; error out! */
+			/* the allowedConninfoKeywords lacks this keyword; error out! */
 			StringInfoData msgString;
 			initStringInfo(&msgString);
 

src/backend/distributed/shared_library_init.c

@@ -1516,14 +1516,14 @@ WarnIfDeprecatedExecutorUsed(int *newval, void **extra, GucSource source)
 
 /*
  * NodeConninfoGucCheckHook ensures conninfo settings are in the expected form
- * and that the keywords of all non-null settings are on a whitelist devised to
+ * and that the keywords of all non-null settings are on a allowlist devised to
  * keep users from setting options that may result in confusion.
  */
 static bool
 NodeConninfoGucCheckHook(char **newval, void **extra, GucSource source)
 {
 	/* this array _must_ be kept in an order usable by bsearch */
-	const char *whitelist[] = {
+	const char *allowedConninfoKeywords[] = {
 		"application_name",
 		"connect_timeout",
 			#if defined(ENABLE_GSS) && defined(ENABLE_SSPI)
@@ -1542,8 +1542,8 @@ NodeConninfoGucCheckHook(char **newval, void **extra, GucSource source)
 		"sslrootcert"
 	};
 	char *errorMsg = NULL;
-	bool conninfoValid = CheckConninfo(*newval, whitelist, lengthof(whitelist),
-									   &errorMsg);
+	bool conninfoValid = CheckConninfo(*newval, allowedConninfoKeywords,
+									   lengthof(allowedConninfoKeywords), &errorMsg);
 
 	if (!conninfoValid)
 	{

src/include/distributed/connection_management.h

@@ -213,8 +213,8 @@ extern void AddConnParam(const char *keyword, const char *value);
 extern void GetConnParams(ConnectionHashKey *key, char ***keywords, char ***values,
 						  Index *runtimeParamStart, MemoryContext context);
 extern const char * GetConnParam(const char *keyword);
-extern bool CheckConninfo(const char *conninfo, const char **whitelist,
-						  Size whitelistLength, char **errmsg);
+extern bool CheckConninfo(const char *conninfo, const char **allowedConninfoKeywords,
+						  Size allowedConninfoKeywordsLength, char **errmsg);
 
 
 /* Low-level connection establishment APIs */