skip polars test for old polars

Author: tswast

bigframes/core/compile/polars/__init__.py

@@ -26,13 +26,15 @@
 import bigframes.core.compile.polars.operations.generic_ops  # noqa: F401
 
 try:
-    import polars  # noqa
+    import bigframes._importing
+
+    # Use import_polars() instead of importing directly so that we check the
+    # version numbers.
+    bigframes._importing.import_polars()
 
     from bigframes.core.compile.polars.compiler import PolarsCompiler
 
     __all__ = ["PolarsCompiler"]
 except Exception as exc:
-    msg = (
-        f"Polars compiler not available as polars is not installed. Details: {str(exc)}"
-    )
+    msg = f"Polars compiler not available as there was an exception importing polars. Details: {str(exc)}"
     warnings.warn(msg)

bigframes/core/compile/polars/compiler.py

@@ -42,7 +42,11 @@
     import polars as pl
 else:
     try:
-        import polars as pl
+        import bigframes._importing
+
+        # Use import_polars() instead of importing directly so that we check
+        # the version numbers.
+        pl = bigframes._importing.import_polars()
     except Exception:
         polars_installed = False