SQLite 3.30.1 mishandles pExpr->y.pTab, as demonstrated by the TK_COLUMN case in sqlite3ExprCodeTarget in expr.c.
https://www.oracle.com/security-alerts/cpuapr2020.html
https://usn.ubuntu.com/4205-1/
https://github.com/sqlite/sqlite/commit/57f7ece78410a8aae86aa4625fb7556897db384c
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf