Module executor 

PowDB query executor.

Structs

Engine

PreparedQuery

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).