XQuery, parallel execution

Using xquery:fork-join, errors can happen. Examples:

• Static variable depends on itself: $C:VALUES
• Item expected, sequence found: (element erstellt {…}, …).

Some more work is required to find out which operations are not completely thread-safe.

XQuery (with the next branch):

let $x := <x/>
return xquery:fork-join(
  for $i in 1 to 10000
  return function() { $x/text() }
)

Result:

[XPDY0002] text(): no context value bound.

[ChristianGruen]

Short version: xquery:fork-join((1 to 1000) ! function() { <x/>[@a] })

[sofiageo]

I have another example reproducible with BaseX 9.1.2 - It needs to be run multiple times until it gives an error. It fails faster with more threads

let $x := <test t="OK"></test>
return xquery:fork-join(
  for $i in 1 to 4
  return function() { $x[lower-case(@t) = "ok"] }
)