diff options
Diffstat (limited to 'src/include/nodes/primnodes.h')
| -rw-r--r-- | src/include/nodes/primnodes.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h index 5b190bb99bd..cdbe781c734 100644 --- a/src/include/nodes/primnodes.h +++ b/src/include/nodes/primnodes.h @@ -305,6 +305,12 @@ typedef struct Param * a crosscheck that the Aggrefs match the plan; but note that when aggsplit * indicates a non-final mode, aggtype reflects the transition data type * not the SQL-level output type of the aggregate. + * + * aggno and aggtransno are -1 in the parse stage, and are set in planning. + * Aggregates with the same 'aggno' represent the same aggregate expression, + * and can share the result. Aggregates with same 'transno' but different + * 'aggno' can share the same transition state, only the final function needs + * to be called separately. */ typedef struct Aggref { @@ -326,6 +332,8 @@ typedef struct Aggref char aggkind; /* aggregate kind (see pg_aggregate.h) */ Index agglevelsup; /* > 0 if agg belongs to outer query */ AggSplit aggsplit; /* expected agg-splitting mode of parent Agg */ + int aggno; /* unique ID within the Agg node */ + int aggtransno; /* unique ID of transition state in the Agg */ int location; /* token location, or -1 if unknown */ } Aggref; |