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| author | Peter Eisentraut <peter@eisentraut.org> | 2021-09-15 18:56:13 +0200 |
|---|---|---|
| committer | Peter Eisentraut <peter@eisentraut.org> | 2021-09-15 18:56:13 +0200 |
| commit | 6fe0eb963d3894ae9b0b6e151083887b664d45a3 (patch) | |
| tree | ff5b9f5144c7a0b702b6552a46fbe2e442103c65 /src/include/nodes/nodes.h | |
| parent | 1316be28664f1834ac091113217537101331bdf3 (diff) | |
| download | postgresql-6fe0eb963d3894ae9b0b6e151083887b664d45a3.tar.gz postgresql-6fe0eb963d3894ae9b0b6e151083887b664d45a3.zip | |
Add Cardinality typedef
Similar to Cost and Selectivity, this is just a double, which can be
used in path and plan nodes to give some hint about the meaning of a
field.
Discussion: https://www.postgresql.org/message-id/c091e5cd-45f8-69ee-6a9b-de86912cc7e7@enterprisedb.com
Diffstat (limited to 'src/include/nodes/nodes.h')
| -rw-r--r-- | src/include/nodes/nodes.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/include/nodes/nodes.h b/src/include/nodes/nodes.h index b3ee4194d39..e0057daa061 100644 --- a/src/include/nodes/nodes.h +++ b/src/include/nodes/nodes.h @@ -668,6 +668,7 @@ extern bool equal(const void *a, const void *b); */ typedef double Selectivity; /* fraction of tuples a qualifier will pass */ typedef double Cost; /* execution cost (in page-access units) */ +typedef double Cardinality; /* (estimated) number of rows or other integer count */ /* |