diff options
Diffstat (limited to 'src/include/nodes/plannodes.h')
| -rw-r--r-- | src/include/nodes/plannodes.h | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/src/include/nodes/plannodes.h b/src/include/nodes/plannodes.h index 12742b57e5..9caf0895e4 100644 --- a/src/include/nodes/plannodes.h +++ b/src/include/nodes/plannodes.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/nodes/plannodes.h,v 1.108 2009/01/01 17:24:00 momjian Exp $ + * $PostgreSQL: pgsql/src/include/nodes/plannodes.h,v 1.109 2009/03/21 00:04:40 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -460,7 +460,7 @@ typedef struct MergeJoin } MergeJoin; /* ---------------- - * hash join (probe) node + * hash join node * ---------------- */ typedef struct HashJoin @@ -567,11 +567,20 @@ typedef struct Unique /* ---------------- * hash build node + * + * If the executor is supposed to try to apply skew join optimization, then + * skewTable/skewColumn identify the outer relation's join key column, from + * which the relevant MCV statistics can be fetched. Also, its type + * information is provided to save a lookup. * ---------------- */ typedef struct Hash { Plan plan; + Oid skewTable; /* outer join key's table OID, or InvalidOid */ + AttrNumber skewColumn; /* outer join key's column #, or zero */ + Oid skewColType; /* datatype of the outer key column */ + int32 skewColTypmod; /* typmod of the outer key column */ /* all other info is in the parent HashJoin node */ } Hash; |