diff options
Diffstat (limited to 'src/include/nodes/execnodes.h')
| -rw-r--r-- | src/include/nodes/execnodes.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h index 3b39369a492..52d1fa018b5 100644 --- a/src/include/nodes/execnodes.h +++ b/src/include/nodes/execnodes.h @@ -17,6 +17,7 @@ #include "access/tupconvert.h" #include "executor/instrument.h" #include "fmgr.h" +#include "lib/ilist.h" #include "lib/pairingheap.h" #include "nodes/params.h" #include "nodes/plannodes.h" @@ -2037,6 +2038,71 @@ typedef struct MaterialState Tuplestorestate *tuplestorestate; } MaterialState; +struct ResultCacheEntry; +struct ResultCacheTuple; +struct ResultCacheKey; + +typedef struct ResultCacheInstrumentation +{ + uint64 cache_hits; /* number of rescans where we've found the + * scan parameter values to be cached */ + uint64 cache_misses; /* number of rescans where we've not found the + * scan parameter values to be cached. */ + uint64 cache_evictions; /* number of cache entries removed due to + * the need to free memory */ + uint64 cache_overflows; /* number of times we've had to bypass the + * cache when filling it due to not being + * able to free enough space to store the + * current scan's tuples. */ + uint64 mem_peak; /* peak memory usage in bytes */ +} ResultCacheInstrumentation; + +/* ---------------- + * Shared memory container for per-worker resultcache information + * ---------------- + */ +typedef struct SharedResultCacheInfo +{ + int num_workers; + ResultCacheInstrumentation sinstrument[FLEXIBLE_ARRAY_MEMBER]; +} SharedResultCacheInfo; + +/* ---------------- + * ResultCacheState information + * + * resultcache nodes are used to cache recent and commonly seen results + * from a parameterized scan. + * ---------------- + */ +typedef struct ResultCacheState +{ + ScanState ss; /* its first field is NodeTag */ + int rc_status; /* value of ExecResultCache state machine */ + int nkeys; /* number of cache keys */ + struct resultcache_hash *hashtable; /* hash table for cache entries */ + TupleDesc hashkeydesc; /* tuple descriptor for cache keys */ + TupleTableSlot *tableslot; /* min tuple slot for existing cache entries */ + TupleTableSlot *probeslot; /* virtual slot used for hash lookups */ + ExprState *cache_eq_expr; /* Compare exec params to hash key */ + ExprState **param_exprs; /* exprs containing the parameters to this + * node */ + FmgrInfo *hashfunctions; /* lookup data for hash funcs nkeys in size */ + Oid *collations; /* collation for comparisons nkeys in size */ + uint64 mem_used; /* bytes of memory used by cache */ + uint64 mem_limit; /* memory limit in bytes for the cache */ + MemoryContext tableContext; /* memory context to store cache data */ + dlist_head lru_list; /* least recently used entry list */ + struct ResultCacheTuple *last_tuple; /* Used to point to the last tuple + * returned during a cache hit and + * the tuple we last stored when + * populating the cache. */ + struct ResultCacheEntry *entry; /* the entry that 'last_tuple' belongs to + * or NULL if 'last_tuple' is NULL. */ + bool singlerow; /* true if the cache entry is to be marked as + * complete after caching the first tuple. */ + ResultCacheInstrumentation stats; /* execution statistics */ + SharedResultCacheInfo *shared_info; /* statistics for parallel workers */ +} ResultCacheState; /* ---------------- * When performing sorting by multiple keys, it's possible that the input |