diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/system-views.sgml | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/doc/src/sgml/system-views.sgml b/doc/src/sgml/system-views.sgml index 7078491c4c0..0ef17456318 100644 --- a/doc/src/sgml/system-views.sgml +++ b/doc/src/sgml/system-views.sgml @@ -3799,6 +3799,45 @@ SELECT * FROM pg_locks pl LEFT JOIN pg_prepared_xacts ppx non-null elements. (Null for scalar types.) </para></entry> </row> + + <row> + <entry role="catalog_table_entry"><para role="column_definition"> + <structfield>range_length_histogram</structfield> <type>anyarray</type> + </para> + <para> + A histogram of the lengths of non-empty and non-null range values of a + range type column. (Null for non-range types.) + </para> + <para> + This histogram is calculated using the <literal>subtype_diff</literal> + range function regardless of whether range bounds are inclusive. + </para></entry> + </row> + + <row> + <entry role="catalog_table_entry"><para role="column_definition"> + <structfield>range_empty_frac</structfield> <type>float4</type> + </para> + <para> + Fraction of column entries whose values are empty ranges. + (Null for non-range types.) + </para></entry> + </row> + + <row> + <entry role="catalog_table_entry"><para role="column_definition"> + <structfield>range_bounds_histogram</structfield> <type>anyarray</type> + </para> + <para> + A histogram of lower and upper bounds of non-empty and non-null range + values. (Null for non-range types.) + </para> + <para> + These two histograms are represented as a single array of ranges, whose + lower bounds represent the histogram of lower bounds, and upper bounds + represent the histogram of upper bounds. + </para></entry> + </row> </tbody> </tgroup> </table> |