[INDEXES_WITH_NULL_VALUES] Enhance support for partitioned tables/indexes

sql/indexes_with_null_values.sql

@@ -7,19 +7,21 @@
 
 -- Finds indexes that can contain null values.
 select
-    x.indrelid::regclass::text as table_name,
-    x.indexrelid::regclass::text as index_name,
+    i.indrelid::regclass::text as table_name,
+    i.indexrelid::regclass::text as index_name,
     string_agg(a.attname, ', ') as nullable_fields, /* in fact, there will always be only one column */
-    pg_relation_size(x.indexrelid) as index_size
+    pg_relation_size(i.indexrelid) as index_size
 from
-    pg_catalog.pg_index x
-    inner join pg_catalog.pg_stat_all_indexes psai on psai.indexrelid = x.indexrelid
-    inner join pg_catalog.pg_attribute a on a.attrelid = x.indrelid and a.attnum = any(x.indkey)
+    pg_catalog.pg_index i
+    inner join pg_catalog.pg_class ic on ic.oid = i.indexrelid
+    inner join pg_catalog.pg_namespace nsp on nsp.oid = ic.relnamespace
+    inner join pg_catalog.pg_attribute a on a.attrelid = i.indrelid and a.attnum = any(i.indkey)
 where
-    not x.indisunique and
+    not i.indisunique and
     not a.attnotnull and
-    psai.schemaname = :schema_name_param::text and
-    array_position(x.indkey, a.attnum) = 0 and /* only for first segment */
-    (x.indpred is null or (position(lower(a.attname) in lower(pg_get_expr(x.indpred, x.indrelid))) = 0))
-group by x.indrelid, x.indexrelid, x.indpred
+    not ic.relispartition and
+    nsp.nspname = :schema_name_param::text and
+    array_position(i.indkey, a.attnum) = 0 and /* only for first segment */
+    (i.indpred is null or (position(lower(a.attname) in lower(pg_get_expr(i.indpred, i.indrelid))) = 0))
+group by i.indrelid, i.indexrelid, i.indpred
 order by table_name, index_name;