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Merge 'core: Fix Statement::reset()' from Pekka Enberg

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The first rule of writing fast programs: don't use dynamic memory
allocation!
Brings `SELECT 1` micro-benchmark back to 70 ns, which is a bit closer
to what we had before.

Reviewed-by: Jussi Saurio <jussi.saurio@gmail.com>

Closes #781
This commit is contained in:
Pekka Enberg
2025-01-26 11:56:44 +02:00
parent 17e7e03423 8942c38bda
commit 609839d79a
2 changed files with 14 additions and 2 deletions
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3
core/lib.rs
View File

@@ -486,8 +486,7 @@ impl Statement {
}
pub fn reset(&mut self) {
let state = vdbe::ProgramState::new(self.program.max_registers);
self.state = state
self.state.reset();
}
}

13
core/vdbe/mod.rs
View File

@@ -258,6 +258,19 @@ impl ProgramState {
}
pub fn reset(&mut self) {
self.pc = 0;
self.btree_table_cursors.borrow_mut().clear();
self.btree_index_cursors.borrow_mut().clear();
self.pseudo_cursors.borrow_mut().clear();
self.sorter_cursors.borrow_mut().clear();
let max_registers = self.registers.len();
self.registers.clear();
self.registers.resize(max_registers, OwnedValue::Null);
self.last_compare = None;
self.deferred_seek = None;
self.ended_coroutine.clear();
self.regex_cache.like.clear();
self.interrupted = false;
self.parameters.clear();
}
}