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Diffstat (limited to 'src/include/nodes/primnodes.h')
| -rw-r--r-- | src/include/nodes/primnodes.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h index dec7d5c775f..6c96fa2f516 100644 --- a/src/include/nodes/primnodes.h +++ b/src/include/nodes/primnodes.h @@ -190,6 +190,14 @@ typedef struct Expr * row identity information during UPDATE/DELETE/MERGE. This value should * never be seen outside the planner. * + * varnullingrels is the set of RT indexes of outer joins that can force + * the Var's value to null (at the point where it appears in the query). + * See optimizer/README for discussion of that. + * + * varlevelsup is greater than zero in Vars that represent outer references. + * Note that it affects the meaning of all of varno, varnullingrels, and + * varnosyn, all of which refer to the range table of that query level. + * * In the parser, varnosyn and varattnosyn are either identical to * varno/varattno, or they specify the column's position in an aliased JOIN * RTE that hides the semantic referent RTE's refname. This is a syntactic @@ -232,6 +240,8 @@ typedef struct Var int32 vartypmod; /* OID of collation, or InvalidOid if none */ Oid varcollid; + /* RT indexes of outer joins that can replace the Var's value with null */ + Bitmapset *varnullingrels; /* * for subquery variables referencing outer relations; 0 in a normal var, |