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Commit6eb2f0e

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Add missing MaterialPath support in reparameterize_path[_by_child].
These two functions failed to cover MaterialPath. That's not afatal problem, but we can generate better plans in some casesif we support it.Tom Lane and Richard GuoDiscussion:https://postgr.es/m/1854233.1669949723@sss.pgh.pa.us
1 parentfe12f2f commit6eb2f0e

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‎src/backend/optimizer/util/pathnode.c

Lines changed: 24 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -3979,6 +3979,18 @@ reparameterize_path(PlannerInfo *root, Path *path,
39793979
apath->path.parallel_aware,
39803980
-1);
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}
3982+
caseT_Material:
3983+
{
3984+
MaterialPath*mpath= (MaterialPath*)path;
3985+
Path*spath=mpath->subpath;
3986+
3987+
spath=reparameterize_path(root,spath,
3988+
required_outer,
3989+
loop_count);
3990+
if (spath==NULL)
3991+
returnNULL;
3992+
return (Path*)create_material_path(rel,spath);
3993+
}
39823994
caseT_Memoize:
39833995
{
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MemoizePath*mpath= (MemoizePath*)path;
@@ -4013,7 +4025,8 @@ reparameterize_path(PlannerInfo *root, Path *path,
40134025
* path->parent, which does not change during the translation. Hence those
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* members are copied as they are.
40154027
*
4016-
* If the given path can not be reparameterized, the function returns NULL.
4028+
* Currently, only a few path types are supported here, though more could be
4029+
* added at need. We return NULL if we can't reparameterize the given path.
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*/
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Path*
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reparameterize_path_by_child(PlannerInfo*root,Path*path,
@@ -4211,6 +4224,16 @@ do { \
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}
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break;
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4227+
caseT_MaterialPath:
4228+
{
4229+
MaterialPath*mpath;
4230+
4231+
FLAT_COPY_PATH(mpath,path,MaterialPath);
4232+
REPARAMETERIZE_CHILD_PATH(mpath->subpath);
4233+
new_path= (Path*)mpath;
4234+
}
4235+
break;
4236+
42144237
caseT_MemoizePath:
42154238
{
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MemoizePath*mpath;

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