Some queries that use simple-subject-crawl strategy throw an error

[mpoffald]

The following query:

{:select {"?s" ["*"]} 
:where  [["?s" :ex/favColor "?color"]]}

Throws this error:

#error {	  
	   :cause "class clojure.lang.PersistentArrayMap cannot be cast to class java.lang.Number (clojure.lang.PersistentArrayMap is in unnamed module of loader 'app'; java.lang.Number is in module java.base of loader 'bootstrap')"
	   :via
	   [{:type java.lang.ClassCastException
	     :message "class clojure.lang.PersistentArrayMap cannot be cast to class java.lang.Number (clojure.lang.PersistentArrayMap is in unnamed module of loader 'app'; java.lang.Number is in module java.base of loader 'bootstrap')"
	     :at [fluree.db.flake$cmp_long invokeStatic "flake.cljc" 310]}]
	   :trace
	   [[fluree.db.flake$cmp_long invokeStatic "flake.cljc" 310]
	    [fluree.db.flake$cmp_long invoke "flake.cljc" 309]
	    [fluree.db.flake$cmp_pred invokeStatic "flake.cljc" 321]
	    [fluree.db.flake$cmp_pred invoke "flake.cljc" 320]
	    [fluree.db.flake$cmp_flakes_psot invokeStatic "flake.cljc" 382]
	    [fluree.db.flake$cmp_flakes_psot invoke "flake.cljc" 380]
	    [clojure.lang.AFunction compare "AFunction.java" 51]
	    [clojure.data.avl$insert_BANG_ invokeStatic "avl.clj" 797]
	    [clojure.data.avl$insert_BANG_ invoke "avl.clj" 791]
	    [clojure.data.avl.AVLTransientMap assoc "avl.clj" 1606]
	    [clojure.data.avl.AVLTransientSet conj "avl.clj" 1810]
	    [clojure.core$conj_BANG_ invokeStatic "core.clj" 3367]
	    [clojure.core$conj_BANG_ invoke "core.clj" 3359]
	    [clojure.lang.ArraySeq reduce "ArraySeq.java" 119]
	    [clojure.core$reduce invokeStatic "core.clj" 6885]
	    [clojure.core$reduce invoke "core.clj" 6868]
	    [clojure.data.avl$sorted_set_by invokeStatic "avl.clj" 1933]
	    [clojure.data.avl$sorted_set_by doInvoke "avl.clj" 1928]
	    [clojure.lang.RestFn applyTo "RestFn.java" 139]
	    [clojure.core$apply invokeStatic "core.clj" 669]
	    [clojure.core$apply invoke "core.clj" 662]
	    [fluree.db.flake$sorted_set_by invokeStatic "flake.cljc" 526]
	    [fluree.db.flake$sorted_set_by doInvoke "flake.cljc" 524]
	    [clojure.lang.RestFn invoke "RestFn.java" 439]
	    [fluree.db.query.subject_crawl.subject$subjects_chan invokeStatic "subject.cljc" 42]
	    [fluree.db.query.subject_crawl.subject$subjects_chan invoke "subject.cljc" 15]
	    [fluree.db.query.subject_crawl.subject$subj_crawl$fn__26529$state_machine__7578__auto____26554$fn__26557 invoke "subject.cljc" 155]
	    [fluree.db.query.subject_crawl.subject$subj_crawl$fn__26529$state_machine__7578__auto____26554 invoke "subject.cljc" 143]
	    [clojure.core.async.impl.runtime$run_state_machine invokeStatic "runtime.clj" 62]
	    [clojure.core.async.impl.runtime$run_state_machine invoke "runtime.clj" 61]
	    [clojure.core.async.impl.runtime$run_state_machine_wrapped invokeStatic "runtime.clj" 66]
	    [clojure.core.async.impl.runtime$run_state_machine_wrapped invoke "runtime.clj" 64]
	    [fluree.db.query.subject_crawl.subject$subj_crawl$fn__26529 invoke "subject.cljc" 143]
	    [clojure.lang.AFn run "AFn.java" 22]
	    [java.util.concurrent.ThreadPoolExecutor runWorker "ThreadPoolExecutor.java" 1136]
	    [java.util.concurrent.ThreadPoolExecutor$Worker run "ThreadPoolExecutor.java" 635]
	    [clojure.core.async.impl.concurrent$counted_thread_factory$reify__1977$fn__1978 invoke "concurrent.clj" 29]
	    [clojure.lang.AFn run "AFn.java" 22]
	    [java.lang.Thread run "Thread.java" 833]]}

Given the appropriate context/data, this query should run (and in fact, when I remove this or and allow this to run with the default strategy, it does).

Unsure if this is relevant, but: other tests exist which successfully utilize the simple-subject-crawl strategy. I found several in this test ns. All of them use a :from key, none use a :where.

[mpoffald]

Things I tried so far that still resulted in the same error:

• using symbols and strings for the vars
• using :* instead of "*"

[bplatz]

Hi, is this being worked on? I can take a quick look if not.

[mpoffald]

I'd like to take this one, I already started looking into it a bit yesterday