Doc: remove obsolete comment.

This para should have been removed by 2f9661311, which made it
both false and irrelevant.  Noted while looking at SQL function
plancache patch.

diff --git a/src/include/utils/plancache.h b/src/include/utils/plancache.h
index f1fc770733873744bad51447d9696a4eb074bc8e..199cc323a28637274a98e7c4268060073daf29bf 100644 (file)
--- a/src/include/utils/plancache.h
+++ b/src/include/utils/plancache.h
@@ -89,18 +89,13 @@ extern PGDLLIMPORT int plan_cache_mode;
  * all subsidiary data live in the caller's CurrentMemoryContext, and there
  * is no way to free memory short of clearing that entire context.  A oneshot
  * plan is always treated as unsaved.
- *
- * Note: the string referenced by commandTag is not subsidiary storage;
- * it is assumed to be a compile-time-constant string.  As with portals,
- * commandTag shall be NULL if and only if the original query string (before
- * rewriting) was an empty string.
  */
 typedef struct CachedPlanSource
 {
    int         magic;          /* should equal CACHEDPLANSOURCE_MAGIC */
    struct RawStmt *raw_parse_tree; /* output of raw_parser(), or NULL */
    const char *query_string;   /* source text of query */
-   CommandTag  commandTag;     /* 'nuff said */
+   CommandTag  commandTag;     /* command tag for query */
    Oid        *param_types;    /* array of parameter type OIDs, or NULL */
    int         num_params;     /* length of param_types array */
    ParserSetupHook parserSetup;    /* alternative parameter spec method */