gnu: python-dask: Propagate python-dask-expr.

* gnu/packages/python-xyz.scm (python-dask/bootstrap): New variable.
(python-dask)[propagated-inputs]: Add python-dask-expr.
* gnu/packages/python-science.scm (python-dask-expr)[propagated-inputs]:
Remove python-dask.
[native-inputs]: Add python-dask/bootstrap.

Change-Id: I1196641425421c7dde94c6fea8d573e78db9c402

gnu/packages/python-science.scm

@@ -2129,9 +2129,12 @@ (define-public python-dask-expr
               (substitute* "setup.py"
                 (("versioneer.get_version\\(\\)")
                  (string-append "\"" #$version "\""))))))))
-    (propagated-inputs (list python-dask python-pandas python-pyarrow))
+    (propagated-inputs (list python-pandas python-pyarrow))
     (native-inputs
-     (list python-pytest
+     ;; We use python-dask/bootstrap so that python-dask can propagate this
+     ;; package without creating a mutually recursive dependency.
+     (list python-dask/bootstrap
+           python-pytest
            python-versioneer))
     (home-page "https://github.com/dask/dask-expr")
     (synopsis "Dask DataFrames with query optimization")

gnu/packages/python-xyz.scm

@@ -28106,6 +28106,7 @@ (define-public python-dask
     (propagated-inputs
      (list python-click ;needed at runtime
            python-cloudpickle
+           python-dask-expr
            python-fsspec
            python-importlib-metadata ;needed at runtime for dask/_compatibility.py
            python-numpy
@@ -28132,6 +28133,17 @@ (define-public python-dask
 run on top of the dynamic task schedulers.")
     (license license:bsd-3)))
 
+(define-public python-dask/bootstrap
+  (package
+    (inherit python-dask)
+    (properties '((hidden? . #true)))
+    (arguments
+     (substitute-keyword-arguments (package-arguments python-dask)
+       ((#:tests? _ #t) #f)))
+    (propagated-inputs
+     (modify-inputs (package-propagated-inputs python-dask)
+       (delete "python-dask-expr")))))
+
 (define-public python-dask-image
   (package
     (name "python-dask-image")