如果数组为空，则返回0下面的示例接受array values、NULL或empty string作为查询参数。
*/ /* Directly store the values/nulls array in the slot */ if (!NextCopyFrom(cstate, econtext, myslot->tts_values, myslot->tts_isnull)) break; /* ... */ ExecStoreVirtualTuple(myslot); /* * Constraints and where clause might reference the tableoid column, * so (re-)initialize...
"invalid spinlock number: %d",lockndx);/* Note that TAS macros return 0 if *success* */return!PGSemaphoreTryLock(SpinlockSemaArray[lockndx-1]);}boolPGSemaphoreTryLock(PGSemaphoresema){interrStatus;/** Note: if errStatus is -1 and errno == EINTR then it means...
AI代码解释 postgres=# select*from pg_database;oid|datname|datdba|encoding|datcollate|datctype|datistemplate|datallowconn|datconnlimit|datlastsysoid|datfrozenxid|datminmxid|dattablespace|datacl---+---+---+---+---+---+---+---+---+---+---+---+---+---...
Create roaringbitmap from integer array ``rb_build('{1,2,3,4,5}')`` {1,2,3,4,5} rb_index roaringbitmap,integer bigint Return the 0-based index of element in this roaringbitmap, or -1 if do not exsits ``rb_index('{1,2,3}',3)`` ...
LOCK*lock;/* associated LOCK object, if any */ PROCLOCK*proclock;/* associated PROCLOCK object, if any */ int64nLocks;/* total number of times lock is held */ intnumLockOwners;/* # of relevant ResourceOwners */ intmaxLockOwners;/* allocated size of array */ ...
The partitioned table is itself empty. A data rowinsertedinto the table is routed to a partitionbasedon the value of columnsorexpressions in the partition key. If no existing partition matches the values in the new row, an error willbereported. ...
* limit_tuples is a hard limit on number of tuples to retrieve, * or -1 if no limit * * Output parameters: * *cheapest_path receives the overall-cheapest path for the query * *sorted_path receives the cheapest presorted path for the query, ...
缓冲区表层是存放buffer_tags和buffer_ids关系的哈希表,buffer_ids表示存储的数据页的元数据buffer描述符的序号,而buffer_tags是关系表数据页的标识符(The buffer table is a hash table that stores the relations between the buffer_tags of stored pages and the buffer_ids of the descriptors that hold the ...
SELECT regexp_split_to_array('the quick brown fox jumps over the lazy dog', E'\\s+'); regexp_split_to_array --- {the,quick,brown,fox,jumps,over,the,lazy,dog} (1 row) 日期、数字、字符串格式化输出 格式化函数 时间、日期格式化样式 时间日期格式化前缀 数字格式化样式 数字格式化前缀 to...