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+# 2020 April 22
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+# This file implements regression tests for SQLite library.
+#
+
+####################################################
+# DO NOT EDIT! THIS FILE IS AUTOMATICALLY GENERATED!
+####################################################
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+set testprefix upfrom1
+
+do_execsql_test 1.1.0 {
+  DROP TABLE IF EXISTS t2;
+  CREATE TABLE t2(a INTEGER PRIMARY KEY, b INTEGER, c INTEGER) WITHOUT ROWID;
+  INSERT INTO t2 VALUES(1, 2, 3);
+  INSERT INTO t2 VALUES(4, 5, 6);
+  INSERT INTO t2 VALUES(7, 8, 9);
+
+  DROP TABLE IF EXISTS chng;
+  CREATE TABLE chng(a INTEGER, b INTEGER, c INTEGER);
+  INSERT INTO chng VALUES(1, 100, 1000);
+  INSERT INTO chng VALUES(7, 700, 7000);
+} {}
+
+do_execsql_test 1.1.1 {
+  SELECT * FROM t2;
+} {1 2 3   4 5 6   7 8 9}
+
+do_execsql_test 1.1.2 {
+  UPDATE t2 SET b = chng.b, c = chng.c FROM chng WHERE chng.a = t2.a;
+  SELECT * FROM t2 ORDER BY a;
+} {1 100 1000   4 5 6   7 700 7000}
+
+do_execsql_test 1.1.3 {
+  DELETE FROM t2;
+  INSERT INTO t2 VALUES(1, 2, 3);
+  INSERT INTO t2 VALUES(4, 5, 6);
+  INSERT INTO t2 VALUES(7, 8, 9);
+} {}
+
+do_execsql_test 1.1.4 {
+  UPDATE t2 SET (b, c) = (SELECT b, c FROM chng WHERE a=t2.a) 
+    WHERE a IN (SELECT a FROM chng);
+  SELECT * FROM t2 ORDER BY a;
+} {1 100 1000   4 5 6   7 700 7000}
+
+do_execsql_test 1.1.5 {
+  DROP TABLE IF EXISTS t3;
+  CREATE TABLE t3(a INTEGER PRIMARY KEY, b INTEGER, c TEXT) WITHOUT ROWID;
+  INSERT INTO t3 VALUES(1, 1, 'one');
+  INSERT INTO t3 VALUES(2, 2, 'two');
+  INSERT INTO t3 VALUES(3, 3, 'three');
+
+  DROP TABLE IF EXISTS t4;
+  CREATE TABLE t4(x TEXT);
+  INSERT INTO t4 VALUES('five');
+
+  SELECT * FROM t3 ORDER BY a;
+} {1 1 one   2 2 two   3 3 three}
+
+do_execsql_test 1.1.6 {
+  UPDATE t3 SET c=x FROM t4;
+  SELECT * FROM t3 ORDER BY a;
+} {1 1 five   2 2 five   3 3 five}
+
+do_execsql_test 1.2.0 {
+  DROP TABLE IF EXISTS t2;
+  CREATE TABLE t2(a INTEGER PRIMARY KEY, b INTEGER, c INTEGER) ;
+  INSERT INTO t2 VALUES(1, 2, 3);
+  INSERT INTO t2 VALUES(4, 5, 6);
+  INSERT INTO t2 VALUES(7, 8, 9);
+
+  DROP TABLE IF EXISTS chng;
+  CREATE TABLE chng(a INTEGER, b INTEGER, c INTEGER);
+  INSERT INTO chng VALUES(1, 100, 1000);
+  INSERT INTO chng VALUES(7, 700, 7000);
+} {}
+
+do_execsql_test 1.2.1 {
+  SELECT * FROM t2;
+} {1 2 3   4 5 6   7 8 9}
+
+do_execsql_test 1.2.2 {
+  UPDATE t2 SET b = chng.b, c = chng.c FROM chng WHERE chng.a = t2.a;
+  SELECT * FROM t2 ORDER BY a;
+} {1 100 1000   4 5 6   7 700 7000}
+
+do_execsql_test 1.2.3 {
+  DELETE FROM t2;
+  INSERT INTO t2 VALUES(1, 2, 3);
+  INSERT INTO t2 VALUES(4, 5, 6);
+  INSERT INTO t2 VALUES(7, 8, 9);
+} {}
+
+do_execsql_test 1.2.4 {
+  UPDATE t2 SET (b, c) = (SELECT b, c FROM chng WHERE a=t2.a) 
+    WHERE a IN (SELECT a FROM chng);
+  SELECT * FROM t2 ORDER BY a;
+} {1 100 1000   4 5 6   7 700 7000}
+
+do_execsql_test 1.2.5 {
+  DROP TABLE IF EXISTS t3;
+  CREATE TABLE t3(a INTEGER PRIMARY KEY, b INTEGER, c TEXT) ;
+  INSERT INTO t3 VALUES(1, 1, 'one');
+  INSERT INTO t3 VALUES(2, 2, 'two');
+  INSERT INTO t3 VALUES(3, 3, 'three');
+
+  DROP TABLE IF EXISTS t4;
+  CREATE TABLE t4(x TEXT);
+  INSERT INTO t4 VALUES('five');
+
+  SELECT * FROM t3 ORDER BY a;
+} {1 1 one   2 2 two   3 3 three}
+
+do_execsql_test 1.2.6 {
+  UPDATE t3 SET c=x FROM t4;
+  SELECT * FROM t3 ORDER BY a;
+} {1 1 five   2 2 five   3 3 five}
+
+do_execsql_test 2.1 {
+  DROP TABLE IF EXISTS t5;
+  DROP TABLE IF EXISTS m1;
+  DROP TABLE IF EXISTS m2;
+  CREATE TABLE t5(a INTEGER PRIMARY KEY, b TEXT, c TEXT);
+  CREATE TABLE m1(x INTEGER PRIMARY KEY, y TEXT);
+  CREATE TABLE m2(u INTEGER PRIMARY KEY, v TEXT);
+
+  INSERT INTO t5 VALUES(1, 'one', 'ONE');
+  INSERT INTO t5 VALUES(2, 'two', 'TWO');
+  INSERT INTO t5 VALUES(3, 'three', 'THREE');
+  INSERT INTO t5 VALUES(4, 'four', 'FOUR');
+
+  INSERT INTO m1 VALUES(1, 'i');
+  INSERT INTO m1 VALUES(2, 'ii');
+  INSERT INTO m1 VALUES(3, 'iii');
+
+  INSERT INTO m2 VALUES(1, 'I');
+  INSERT INTO m2 VALUES(3, 'II');
+  INSERT INTO m2 VALUES(4, 'III');
+} {}
+
+do_execsql_test 2.2 {
+  UPDATE t5 SET b=y, c=v FROM m1 LEFT JOIN m2 ON (x=u) WHERE x=a;
+  SELECT * FROM t5 ORDER BY a;
+} {1 i I   2 ii {}   3 iii II   4 four FOUR}
+
+# PG says ERROR:  table name "t5" specified more than once
+do_test 2.3.1 { catch { execsql {
+  UPDATE t5 SET b=1 FROM t5;
+} } } 1
+
+# PG says ERROR:  table name "apples" specified more than once
+do_test 2.3.2 { catch { execsql {
+  UPDATE t5 AS apples SET b=1 FROM t5 AS apples;
+} } } 1
+
+# Problem found by OSSFuzz on 2020-07-20
+# https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24282
+#
+reset_db
+do_execsql_test 3.1 {
+  CREATE TABLE t0(a);
+  CREATE TABLE t1(b);
+  UPDATE t1 SET b=sum(a) FROM t0;
+  SELECT * FROM t0, t1;
+} {}
+
+# Problem described by forum post https://sqlite.org/forum/forumpost/a274248080
+#
+reset_db
+do_execsql_test 4.1 {
+  CREATE TABLE t1(x INT);  INSERT INTO t1 VALUES(1);
+  CREATE TABLE t2(y INT);  INSERT INTO t2 VALUES(2);
+  WITH t1 AS (SELECT y+100 AS x FROM t2) 
+    UPDATE t1 SET x=(SELECT x FROM t1);
+  SELECT x, y FROM t1, t2;
+} {102 2}
+do_execsql_test 4.2 {
+  WITH t1 AS (SELECT y+100 AS x FROM t2)
+    UPDATE t1 SET x=x+y FROM t2;
+  SELECT x, y FROM t1, t2;
+} {104 2}
+
+# 2021-05-20
+# Forum https://sqlite.org/forum/forumpost/339f487de5 by Yu Liang
+# A bad assert()
+#
+reset_db
+do_execsql_test 5.1 {
+  CREATE TABLE t1(a);
+  INSERT INTO t1(a) VALUES(5);
+  CREATE VIEW t2 AS SELECT a FROM t1 UNION ALL SELECT a FROM t1;
+  CREATE TABLE t3(b,c);
+  INSERT INTO t3(b,c) VALUES(1,2);
+  UPDATE t3 SET (c,b) = (SELECT 3,4) FROM t1, t2;
+  SELECT * FROM t3;
+} {4 3}
+
+
+finish_test