diff options
Diffstat (limited to 'src/include/nodes/relation.h')
| -rw-r--r-- | src/include/nodes/relation.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/include/nodes/relation.h b/src/include/nodes/relation.h index d901a85e7ac..6606e67055b 100644 --- a/src/include/nodes/relation.h +++ b/src/include/nodes/relation.h @@ -1445,8 +1445,10 @@ typedef struct MinMaxAggInfo * from a NestLoop node of that level to its inner scan. The varlevelsup * value in the Var will always be zero. * - * A PlaceHolderVar: this works much like the Var case. It is currently - * only needed for NestLoop parameters, not outer references. + * A PlaceHolderVar: this works much like the Var case, except that the + * entry is a PlaceHolderVar node with a contained expression. The PHV + * will have phlevelsup = 0, and the contained expression is adjusted + * to match in level. * * An Aggref (with an expression tree representing its argument): the slot * represents an aggregate expression that is an outer reference for some |