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| author | Simon Riggs <simon@2ndQuadrant.com> | 2015-05-15 14:37:10 -0400 |
|---|---|---|
| committer | Simon Riggs <simon@2ndQuadrant.com> | 2015-05-15 14:37:10 -0400 |
| commit | f6d208d6e51810c73f0e02c477984a6b44627f11 (patch) | |
| tree | 99d540d0b7bda73ff60479f15444f554403d4679 /src/backend/executor/execAmi.c | |
| parent | 11a83bbedd73800db70f6f2af5a8eb10d15d39d7 (diff) | |
| download | postgresql-f6d208d6e51810c73f0e02c477984a6b44627f11.tar.gz postgresql-f6d208d6e51810c73f0e02c477984a6b44627f11.zip | |
TABLESAMPLE, SQL Standard and extensible
Add a TABLESAMPLE clause to SELECT statements that allows
user to specify random BERNOULLI sampling or block level
SYSTEM sampling. Implementation allows for extensible
sampling functions to be written, using a standard API.
Basic version follows SQLStandard exactly. Usable
concrete use cases for the sampling API follow in later
commits.
Petr Jelinek
Reviewed by Michael Paquier and Simon Riggs
Diffstat (limited to 'src/backend/executor/execAmi.c')
| -rw-r--r-- | src/backend/executor/execAmi.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/backend/executor/execAmi.c b/src/backend/executor/execAmi.c index 6ebad2f03f0..4948a265cb2 100644 --- a/src/backend/executor/execAmi.c +++ b/src/backend/executor/execAmi.c @@ -39,6 +39,7 @@ #include "executor/nodeNestloop.h" #include "executor/nodeRecursiveunion.h" #include "executor/nodeResult.h" +#include "executor/nodeSamplescan.h" #include "executor/nodeSeqscan.h" #include "executor/nodeSetOp.h" #include "executor/nodeSort.h" @@ -155,6 +156,10 @@ ExecReScan(PlanState *node) ExecReScanSeqScan((SeqScanState *) node); break; + case T_SampleScanState: + ExecReScanSampleScan((SampleScanState *) node); + break; + case T_IndexScanState: ExecReScanIndexScan((IndexScanState *) node); break; @@ -480,6 +485,9 @@ ExecSupportsBackwardScan(Plan *node) } return false; + case T_SampleScan: + return false; + case T_Material: case T_Sort: /* these don't evaluate tlist */ |