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Remove dead code in get_param_path_clause_serials()

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The function get_param_path_clause_serials() is used to get the set of
pushed-down clauses enforced within a parameterized Path.  Since we
don't currently support parameterized MergeAppend paths, and it
doesn't look like that is going to change anytime soon (as explained
in the comments for generate_orderedappend_paths), we don't need to
consider MergeAppendPath in this function.

This change won't make any measurable difference in performance; it's
just for clarity's sake.

Author: Richard Guo
Reviewed-by: Andrei Lepikhov
Discussion: https://postgr.es/m/CAMbWs4_Puie4DQ2ODvjQB_3CxYkUODnrJm8jn_ObMAcrjYNW7Q@mail.gmail.com
This commit is contained in:
Richard Guo
2024-11-26 09:27:53 +09:00
parent a8ccf4e93a
commit cc4c90cef9
1 changed files with 7 additions and 21 deletions
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28
src/backend/optimizer/util/relnode.c
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@ -1911,6 +1911,13 @@ get_param_path_clause_serials(Path *path)
{
if (path->param_info == NULL)
return NULL; /* not parameterized */
/*
* We don't currently support parameterized MergeAppend paths, as
* explained in the comments for generate_orderedappend_paths.
*/
Assert(!IsA(path, MergeAppendPath));
if (IsA(path, NestPath) ||
IsA(path, MergePath) ||
IsA(path, HashPath))
@ -1964,27 +1971,6 @@ get_param_path_clause_serials(Path *path)
}
return pserials;
}
else if (IsA(path, MergeAppendPath))
{
/* Same as AppendPath case */
MergeAppendPath *apath = (MergeAppendPath *) path;
Bitmapset *pserials;
ListCell *lc;
pserials = NULL;
foreach(lc, apath->subpaths)
{
Path *subpath = (Path *) lfirst(lc);
Bitmapset *subserials;
subserials = get_param_path_clause_serials(subpath);
if (lc == list_head(apath->subpaths))
pserials = bms_copy(subserials);
else
pserials = bms_int_members(pserials, subserials);
}
return pserials;
}
else
{
/*