Bitmap Index Scan
Scans an index and produces a bitmap of matching tuple locations.
当前阅读 PG 18·选择有来源记录的版本
此版本暂无所选语言的定义，以下显示原始英文内容。
- Core node tag
- T_BitmapIndexScan
- Structured EXPLAIN Node Type
- Bitmap Index Scan
- Inputs
- An index
- Output
- Tuple-location bitmap, not a tuple stream
- Executor initializer
- ExecInitBitmapIndexScan
- Memory mechanism
- bitmap-lossification
- evidence kind
- source and documentation
- explain names
- Bitmap Index Scan
- explain prefixes
- Parallel, Async
- node tag
- T_BitmapIndexScan
- parallel callbacks
- ExecBitmapIndexScanEstimate, ExecBitmapIndexScanInitializeDSM, ExecBitmapIndexScanInitializeWorker, ExecBitmapIndexScanRetrieveInstrumentation
- partial modes
- 未知
- runtime verified
- false
- strategies
- 未知
版本定义 PG 18
Scans an index and produces a bitmap of matching tuple locations.
EXPLAIN labels in this source build
| Text-format label | Structured node identity |
|---|---|
| Bitmap Index Scan | Bitmap Index Scan |
比较版本
完整来源事实
memory
{"description":"The node allocates a tuple-location bitmap using a work_mem-derived budget. A bitmap can retain page-level lossy entries instead of every tuple location; heap rechecks then remain necessary.","evidence":[{"archive_sha256":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","label":"src/backend/executor/nodeBitmapIndexscan.c","path":"src/backend/executor/nodeBitmapIndexscan.c","sha256":"7eed6439851a24333252fcce6e7c71856e8da9bdaee78597401b11afdbb093c0","url":"https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2"},{"archive_sha256":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","label":"src/backend/nodes/tidbitmap.c","path":"src/backend/nodes/tidbitmap.c","sha256":"e2453b7155d55db8c3a59bc929362f01d3f9692b0a483e5aa81a7b6c50db6102","url":"https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2"}],"mechanism":"bitmap-lossification","source_notes":[]}source inventory
{"executor":"src/backend/executor/execProcnode.c","explain":"src/backend/commands/explain.c","implementation":"src/backend/executor/nodeBitmapIndexscan.c"}来源引用
- src/backend/commands/explain.c:1450
- src/backend/executor/execProcnode.c:229
- src/backend/executor/nodeBitmapIndexscan.c
- src/include/nodes/plannodes.h
- src/backend/nodes/tidbitmap.c
- PostgreSQL 18.6 · using-explain
- PostgreSQL 18.6 · using-explain
定义来源
center · PostgreSQL 18 · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f
正文语言: en · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f