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pass context to aggregate init function

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This commit is contained in:
phiresky 2020-12-18 11:36:35 +01:00
parent e0dbce4366
commit 2cffca874c
1 changed files with 6 additions and 4 deletions
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10
src/functions.rs
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@ -237,7 +237,7 @@ where
/// Initializes the aggregation context. Will be called prior to the first /// Initializes the aggregation context. Will be called prior to the first
/// call to [`step()`](Aggregate::step) to set up the context for an invocation of the /// call to [`step()`](Aggregate::step) to set up the context for an invocation of the
/// function. (Note: `init()` will not be called if there are no rows.) /// function. (Note: `init()` will not be called if there are no rows.)
fn init(&self) -> A; fn init(&self, _: &mut Context<'_>) -> A;
/// "step" function called once for each row in an aggregate group. May be /// "step" function called once for each row in an aggregate group. May be
/// called 0 times if there are no rows. /// called 0 times if there are no rows.
@ -591,13 +591,15 @@ unsafe extern "C" fn call_boxed_step<A, D, T>(
!boxed_aggr.is_null(), !boxed_aggr.is_null(),
"Internal error - null aggregate pointer" "Internal error - null aggregate pointer"
); );
if (*pac as *mut A).is_null() {
*pac = Box::into_raw(Box::new((*boxed_aggr).init()));
}
let mut ctx = Context { let mut ctx = Context {
ctx, ctx,
args: slice::from_raw_parts(argv, argc as usize), args: slice::from_raw_parts(argv, argc as usize),
}; };
if (*pac as *mut A).is_null() {
*pac = Box::into_raw(Box::new((*boxed_aggr).init(&mut ctx)));
}
(*boxed_aggr).step(&mut ctx, &mut **pac) (*boxed_aggr).step(&mut ctx, &mut **pac)
}); });
let r = match r { let r = match r {