walkerDepth      12857 ext/sqlite3/libsqlite/sqlite3.c   int walkerDepth;                          /* Number of subqueries */
walkerDepth      81275 ext/sqlite3/libsqlite/sqlite3.c   pWalker->walkerDepth++;
walkerDepth      81284 ext/sqlite3/libsqlite/sqlite3.c       pWalker->walkerDepth--;
walkerDepth      81292 ext/sqlite3/libsqlite/sqlite3.c   pWalker->walkerDepth--;
walkerDepth      87075 ext/sqlite3/libsqlite/sqlite3.c        && pWalker->walkerDepth==pExpr->op2