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Add Cardinality typedef

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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
This commit is contained in:
Peter Eisentraut
2021-09-15 18:56:13 +02:00
parent 1316be2866
commit 6fe0eb963d
4 changed files with 27 additions and 26 deletions
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src/include/nodes/nodes.h
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@@ -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 */
/*