Search Results cannot be sorted by a date field

[miyachan]

Attempting to perform a search where the order_by field is a date leads to an error:

{"data":"Schema error: 'Field \"ts\" is of type I64!=Date'","status":400}

It looks this is because the FieldValue is implied to be i64:

lnx/engine/src/index/reader.rs

Lines 549 to 552 in 8d38d38

	FieldType::Date(_) => {
	let out: (Vec<(i64, DocAddress)>, usize) =
	order_and_search!(searcher, collector, field, &query, executor)?;
	(process_search!(searcher, schema, out.0), out.1)

[miyachan]

Actual this looks like it might be documentation issue (in tanvity?). According to https://docs.rs/tantivy/0.16.0/tantivy/fastfield/trait.FastValue.html dates cannot be fast fields.

[ChillFish8]

Date fields are fast fields iirc because they're stored as a i64 timestamp internally, or at least according to the docs so its interesting that this behavour doesnt work.
This might require some seperate testing to see if dates requires some other special handling or not but the behavour seems weird.

[ChillFish8]

I have an idea of what Could be causing this but I'll rewuire some test later on today, if im right the type magic might be failing us here :(

[ChillFish8]

Okay, this should be fixed now, this was a consequence of a misleading error due to tantivy not having chrono's serde feature enabled.
The fix has been added to the 0.6.x branch (master) and will be backported to 0.5.1