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Add missing MaterialPath support in reparameterize_path[_by_child].

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These two functions failed to cover MaterialPath.  That's not a
fatal problem, but we can generate better plans in some cases
if we support it.

Tom Lane and Richard Guo

Discussion: https://postgr.es/m/1854233.1669949723@sss.pgh.pa.us
This commit is contained in:
Tom Lane 2022-12-04 13:35:42 -05:00
parent fe12f2f8fa
commit 6eb2f0ed4c
1 changed files with 24 additions and 1 deletions
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25
src/backend/optimizer/util/pathnode.c
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@ -3979,6 +3979,18 @@ reparameterize_path(PlannerInfo *root, Path *path,
apath->path.parallel_aware,
-1);
}
case T_Material:
{
MaterialPath *mpath = (MaterialPath *) path;
Path *spath = mpath->subpath;
spath = reparameterize_path(root, spath,
required_outer,
loop_count);
if (spath == NULL)
return NULL;
return (Path *) create_material_path(rel, spath);
}
case T_Memoize:
{
MemoizePath *mpath = (MemoizePath *) path;
@ -4013,7 +4025,8 @@ reparameterize_path(PlannerInfo *root, Path *path,
* path->parent, which does not change during the translation. Hence those
* members are copied as they are.
*
* If the given path can not be reparameterized, the function returns NULL.
* Currently, only a few path types are supported here, though more could be
* added at need. We return NULL if we can't reparameterize the given path.
*/
Path *
reparameterize_path_by_child(PlannerInfo *root, Path *path,
@ -4211,6 +4224,16 @@ do { \
}
break;
case T_MaterialPath:
{
MaterialPath *mpath;
FLAT_COPY_PATH(mpath, path, MaterialPath);
REPARAMETERIZE_CHILD_PATH(mpath->subpath);
new_path = (Path *) mpath;
}
break;
case T_MemoizePath:
{
MemoizePath *mpath;