text: -- insert.test
  -- 
  -- execsql {
  --     CREATE TABLE t6(x INTEGER PRIMARY KEY, y);
  --     INSERT INTO t6 VALUES(1,1);
  --     INSERT INTO t6 VALUES(2,2);
  --     INSERT INTO t6 VALUES(3,3);
  --     INSERT INTO t6 SELECT nullif(y*2+10,14), y+100 FROM t6;
  --     SELECT x, y FROM t6;
  -- }
  CREATE TABLE t6(x INTEGER PRIMARY KEY, y);
  INSERT INTO t6 VALUES(1,1);
  INSERT INTO t6 VALUES(2,2);
  INSERT INTO t6 VALUES(3,3);
  INSERT INTO t6 SELECT nullif(y*2+10,14), y+100 FROM t6;
  SELECT x, y FROM t6;