Doc: Fix description of pg_class.relreplident

The description missed a comma and lacked an explanation of what happens
with REPLICA IDENTITY USING INDEX when the dependent index is dropped.

Author: Marina Polyakova
Reviewed-by: Daniel Gustafsson, Michael Paquier
Discussion: https://postgr.es/m/ad1a0badc32658b1bbb07aa312346a1d@postgrespro.ru
Backpatch-through: 9.5

diff --git a/doc/src/sgml/catalogs.sgml b/doc/src/sgml/catalogs.sgml
index 93c6c117b258d23139c3b1a310c02619af0362b3..ac4347f1286e03f0110fe86a81a8aaffea975de5 100644 (file)
--- a/doc/src/sgml/catalogs.sgml
+++ b/doc/src/sgml/catalogs.sgml
@@ -1987,8 +1987,10 @@
        Columns used to form <quote>replica identity</> for rows:
        <literal>d</> = default (primary key, if any),
        <literal>n</> = nothing,
-       <literal>f</> = all columns
-       <literal>i</> = index with <structfield>indisreplident</structfield> set, or default
+       <literal>f</> = all columns,
+       <literal>i</> = index with
+       <structfield>indisreplident</structfield> set (same as nothing if the
+       index used has been dropped)
       </entry>
      </row>