Sample Scan
Reads a relation using the selected table-sampling method.
Reading PG 18·Select a recorded version
- Core node tag
- T_SampleScan
- Structured EXPLAIN Node Type
- Sample Scan
- Inputs
- A relation and sampling method
- Output
- Sampled tuples
- Executor initializer
- ExecInitSampleScan
- Memory mechanism
- unclassified
- evidence kind
- source and documentation
- explain names
- Sample Scan
- explain prefixes
- Parallel, Async
- node tag
- T_SampleScan
- parallel callbacks
- Unknown
- partial modes
- Unknown
- runtime verified
- false
- strategies
- Unknown
Definition PG 18
Reads a relation using the selected table-sampling method.
EXPLAIN labels in this source build
| Text-format label | Structured node identity |
|---|---|
| Sample Scan | Sample Scan |
Compare versions
Complete source facts
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/nodeSamplescan.c","path":"src/backend/executor/nodeSamplescan.c","sha256":"59ddce276a131990661664393bf645d62693a722f382bd040f6b1c2584e7b2a5","url":"https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2"}],"mechanism":"unclassified","source_notes":[]}source inventory
{"executor":"src/backend/executor/execProcnode.c","explain":"src/backend/commands/explain.c","implementation":"src/backend/executor/nodeSamplescan.c"}Source references
- src/backend/commands/explain.c:1435
- src/backend/executor/execProcnode.c:214
- src/backend/executor/nodeSamplescan.c
- src/include/nodes/plannodes.h
Full definition and evidence JSON
Definition sources
center · PostgreSQL 18 · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f
Text language: en · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f