ringerc

craig=> DO
$$
BEGIN
    PERFORM (ARRAY[1])[1];
END;
$$ LANGUAGE plpgsql;

with a breakpoint set at ExecEvalArrayRef results in:

(gdb) bt

ringerc

CREATE UNLOGGED TABLE exclude_test(id integer primary key);
INSERT INTO exclude_test(id) SELECT generate_series(1,50000);

CREATE UNLOGGED TABLE exclude AS SELECT x AS item FROM generate_series(1,40000,4) x;

-- Horrific AND list, takes 80s to plan and execute here:

EXPLAIN ANALYZE SELECT id FROM exclude_test WHERE id <> 1 AND id <> 5 AND id <> 9 AND id <> 13 AND id <> 17 AND id <> 21 AND id <> 25 AND id <> 29 AND id <> 33 AND id <> 37 AND id <> 41 AND id <> 45 AND id <> 49 AND id <> 53 AND id <> 57 AND id <> 61 AND id <> 65 AND id <> 69 AND id <> 73 AND id <> 77 AND id <> 81 AND id <> 85 AND id <> 89 AND id <> 93 AND id <> 97 AND id <> 101 AND id <> 105 AND id <> 109 AND id <> 113 AND id <> 117 AND id <> 121 AND id <> 125 AND id <> 129 AND id <> 133 AND id <> 137 AND id <> 141 AND id <> 145 AND id <> 149 AND id <> 153 AND id <> 157 AND id <> 161 AND id <> 165 AND id <> 169 AND id <> 173 AND id <> 177 AND id <> 181 AND id <> 185 AND id <> 189 AND id <> 193 AND id <> 197 AND id <> 201 AND id <> 205 AND id <> 

ringerc

regress=> DELETE FROM t USING t2 WHERE t.id = t2.id;
LOG:  parse tree:
DETAIL:     {QUERY 
   :commandType 4 
   :querySource 0 
   :canSetTag true 
   :utilityStmt <> 
   :resultRelation 1 
   :hasAggs false 
   :hasWindowFuncs false 

ringerc

regress=> DELETE FROM t;
LOG:  parse tree:
DETAIL:     {QUERY 
   :commandType 4 
   :querySource 0 
   :canSetTag true 
   :utilityStmt <> 
   :resultRelation 1 
   :hasAggs false 
   :hasWindowFuncs false 

ringerc

--- /tmp/simple-delete	2013-11-12 09:26:55.077406915 +0800
+++ /tmp/join-delete	2013-11-12 09:49:06.172045074 +0800
@@ -1,4 +1,4 @@
-regress=> DELETE FROM t;
+regress=> DELETE FROM t USING t2 WHERE t.id = t2.id;
 LOG:  parse tree:
 DETAIL:     {QUERY 
    :commandType 4 
@@ -28,9 +28,27 @@
       :lateral false 

ringerc

regress=> SELECT * FROM t_even;
LOG:  parse tree:
DETAIL:     {QUERY 
   :commandType 1 
   :querySource 0 
   :canSetTag true 
   :utilityStmt <> 
   :resultRelation 0 
   :hasAggs false 
   :hasWindowFuncs false 

ringerc

CREATE SCHEMA myschema;

CREATE TABLE myschema.zzafter(id integer);

CREATE OR REPLACE FUNCTION myschema.aabefore()
RETURNS void
LANGUAGE plpgsql
AS $$
DECLARE
    somefield myschema.zzafter.id%TYPE;

ringerc

/* Simpler version that assumes there is no active tx or snapshot and SPI isn't connected yet */

const char * some_sql = "SELECT 1;";

/* setup */
Assert(!IsTransactionState());
StartTransactionCommand();
SetCurrentStatementStartTimestamp();
SPI_connect();
PushActiveSnapshot(GetTransactionSnapshot());

ringerc

From 0319a7ecbab5c1e85e300d93f674087786be144a Mon Sep 17 00:00:00 2001
From: Craig Ringer <craig@2ndquadrant.com>
Date: Wed, 1 Apr 2015 10:46:29 +0800
Subject: [PATCH] pg_restore -t should select views, matviews, and foreign
 tables

Currently pg_restore's '-t' option selects only tables, not other
relations. It should be able to match anything that behaves like
a relation in the relation namespace, anything that's interchangable
with a table, including:

ringerc

#!/usr/bin/env python
#
# Disconnect/reconnect each query
#
# Takes 0.45s to run here
#
import time
import psycopg2

start_t = time.time()