SIGN IN SIGN UP

Rename sqlite3ExprCodeAtInit() to sqlite3ExprCodeRunJustOnce().

Other changes to make the new code cleaner.  Test cases added.

FossilOrigin-Name: d7f18489978fdbbe3ab317485518cac91a75416ccef55898301afdd76d3b415b
D
drh committed
9b258c54e453edb5c8c81c3d28b2cb6e2b76a13e
Parent: 38dfbda