Bitmap Heap Scan

Visits heap pages selected by a bitmap and performs required rechecks.

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_BitmapHeapScan
Structured EXPLAIN Node Type: Bitmap Heap Scan
Inputs: A tuple-location bitmap and relation
Output: Qualified heap tuples
Executor initializer: ExecInitBitmapHeapScan
Memory mechanism: unclassified
evidence kind: source and documentation
explain names: Bitmap Heap Scan
explain prefixes: Parallel, Async
node tag: T_BitmapHeapScan
parallel callbacks: ExecBitmapHeapEstimate, ExecBitmapHeapInitializeDSM, ExecBitmapHeapInitializeWorker, ExecBitmapHeapReInitializeDSM, ExecBitmapHeapRetrieveInstrumentation
partial modes: 未知
runtime verified: false
strategies: 未知

版本定义 PG 18

Visits heap pages selected by a bitmap and performs required rechecks.

EXPLAIN labels in this source build

Text-format label	Structured node identity
Bitmap Heap Scan	Bitmap Heap Scan

比较版本

完整来源事实

memory

{"description":"This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider.","evidence":[{"archive_sha256":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","label":"src/backend/executor/nodeBitmapHeapscan.c","path":"src/backend/executor/nodeBitmapHeapscan.c","sha256":"0c49bbf89f6614af08dbcea2a1776abc79db23e523e8c1fc852a42215f202206","url":"https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2"}],"mechanism":"unclassified","source_notes":["If we are using lossy info, we have to recheck the qual conditions at every tuple."]}

source inventory

{"executor":"src/backend/executor/execProcnode.c","explain":"src/backend/commands/explain.c","implementation":"src/backend/executor/nodeBitmapHeapscan.c"}

来源引用

完整定义与证据 JSON

定义来源

center · PostgreSQL 18 · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f

正文语言: en · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f