docs: PG 12 relnote adjustments based on feedback from Tom Lane

Discussion: https://postgr.es/m/22793.1558399695@sss.pgh.pa.us

diff --git a/doc/src/sgml/release-12.sgml b/doc/src/sgml/release-12.sgml
index ad1aa6c5301000a517f040b2b170a3a691ba244d..10b3ed56f7898c43ec89067ae998bd5d9dd79fc2 100644 (file)
--- a/doc/src/sgml/release-12.sgml
+++ b/doc/src/sgml/release-12.sgml
@@ -597,12 +597,9 @@ Author: Tom Lane 
 -->
 
        
-        Improve handling of partition dependency (Tom Lane)
-       
-
-       
-        This prevents the creation of inconsistent partition hierarchies
-        in rare cases.
+        Fix bugs that could cause ALTER TABLE DETACH
+        PARTITION to not drop objects that should be dropped,
+        such as automatically-created child indexes (Tom Lane)
        
       
 
@@ -831,28 +828,20 @@ Author: Tom Lane 
 
-
-       
-        Add support for function
-        selectivity (Tom Lane)
-       
-      
-
-      
-
 
        
-        Use the new support function capability to improve optimizer
-        estimates for some functions (Tom Lane)
+        Add support function capability to improve optimizer estimates
+        for functions (Tom Lane)
        
 
        
-        Specifically, improve them for
-        generate_series(),
+        This allows extensions to create planner support functions that
+        can provide function-specific selectivity, cost, and row-count
+        estimates that can depend on the function arguments.  Also, improve
+        in-core estimates for generate_series(),
         unnest(), and functions that return boolean
         values.