From: Matthew Schinckel <matt@schinckel.net>
Date: Fri, 23 Jan 2015 09:02:19 +0000 (+1030)
Subject: Remove two unnecessary operations.
X-Git-Url: https://git.8kb.co.uk/?p=postgresql%2Fpg_jsonb_delete_op;a=commitdiff_plain;h=ba14544b9d0ff0a0065576cd8b6954f5a2aa43ab

Remove two unnecessary operations.

<pre>
[[local]:5432] matt@~ =# EXPLAIN ANALYZE SELECT 'x' <> 'x' FROM generate_series(1,100000);
                                                       QUERY PLAN
-------------------------------------------------------------------------------------------------------------------------
 Function Scan on generate_series  (cost=0.00..10.00 rows=1000 width=0) (actual time=22.346..45.794 rows=100000 loops=1)
 Planning time: 0.042 ms
 Execution time: 59.130 ms
(3 rows)

Time: 59.744 ms
[[local]:5432] matt@~ =# EXPLAIN ANALYZE SELECT 'x' <> 'y' FROM generate_series(1,100000);
                                                       QUERY PLAN
-------------------------------------------------------------------------------------------------------------------------
 Function Scan on generate_series  (cost=0.00..10.00 rows=1000 width=0) (actual time=21.784..45.676 rows=100000 loops=1)
 Planning time: 0.043 ms
 Execution time: 59.294 ms
(3 rows)

Time: 59.663 ms
</pre>
---

diff --git a/pg_jsonb_delete_op.sql b/pg_jsonb_delete_op.sql
index 4f559c8..3a3c818 100755
--- a/pg_jsonb_delete_op.sql
+++ b/pg_jsonb_delete_op.sql
@@ -12,7 +12,7 @@ $BODY$
         (
             SELECT ('{' || string_agg(to_json(key) || ':' || value, ',') || '}')
             FROM jsonb_each(a)
-            WHERE NOT to_json(key)::jsonb ? b
+            WHERE key <> b
         )
     , '{}')::jsonb;
 $BODY$