Module executor 

PowDB query executor.

Modules

mem_budget

Per-query memory budget accumulator (WS2).

Structs

Engine

PreparedQuery

WalDurabilityTicket

A claim on WAL durability handed out by a deferred Full-mode flush: the commit’s records have reached the OS file but are not yet guaranteed on stable storage. Self::wait blocks until an fsync covering them has completed — the caller must not acknowledge the commit before wait returns Ok(()).

Enums

QueryDialect

Query frontend dialect. PowQL remains the default/native dialect; SQL is an explicit frontend that lowers to the same AST before planning.

WalSyncMode

Durability mode for the WAL — analogous to SQLite’s PRAGMA synchronous combined with journal_mode=OFF.

Constants

READONLY_NEEDS_WRITE

Legacy sentinel string constant — kept for backward compatibility with any external code matching on the string representation. New code should match on QueryError::ReadonlyNeedsWrite directly.

Functions

is_read_only_statement

Mission infra-1: classify a parsed statement as read-only vs. mutating. Used by Engine::execute_powql_readonly and by the server handler to decide between the RwLock reader and writer sides. Union recurses because each side can independently be read/write (though in practice both sides are reads — the parser only builds Union from query shapes).