Reset the column cache before coding each step of a trigger program. Candidate fix for #3554. (CVS 6065)

FossilOrigin-Name: a1b1f6cd7d2c060bd75ce39347e1220b872806ed

test/tkt3554.test

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+# 2008 December 24
+#
+# 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.
+#
+# This file implements tests to verify that ticket #3554 has been
+# fixed.  
+#
+# $Id: tkt3554.test,v 1.1 2008/12/26 07:56:39 danielk1977 Exp $
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+ifcapable !trigger {
+  finish_test
+  return
+}
+
+do_test tkt3544-1.1 {
+  execsql {
+    CREATE TABLE test ( obj, t1, t2, PRIMARY KEY(obj, t1, t2) );
+  
+    CREATE TRIGGER test_insert BEFORE INSERT ON test BEGIN
+      UPDATE test SET t1 = new.t1 
+        WHERE obj = new.obj AND new.t1 < t1 AND new.t2 >= t1;
+  
+      UPDATE test SET t2 = new.t2 
+        WHERE obj = new.obj AND new.t2 > t2 AND new.t1 <= t2;
+  
+      SELECT RAISE(IGNORE) WHERE EXISTS (
+        SELECT obj FROM test 
+        WHERE obj = new.obj AND new.t1 >= t1 AND new.t2 <= t2
+      );
+    END;
+  }
+} {}
+
+do_test tkt3544-1.2 {
+  execsql {
+    INSERT INTO test VALUES('a', 10000, 11000);
+    SELECT * FROM test;
+  }
+} {a 10000 11000}
+
+
+do_test tkt3544-1.3 {
+  execsql {
+    INSERT INTO test VALUES('a', 9000, 10500);
+  }
+  execsql { SELECT * FROM test }
+} {a 9000 11000}
+
+do_test tkt3544-1.4 {
+  execsql {
+    INSERT INTO test VALUES('a', 10000, 12000);
+  }
+  execsql { SELECT * FROM test }
+} {a 9000 12000}
+
+finish_test
+