feat(polars): add ArrayStringJoin op (#10638)

Author: IndexSeek

ibis/backends/polars/compiler.py

@@ -568,6 +568,13 @@ def string_join(op, **kw):
     return pl.concat_str(args, separator=sep)
 
 
+@translate.register(ops.ArrayStringJoin)
+def array_string_join(op, **kw):
+    arg = translate(op.arg, **kw)
+    sep = _literal_value(op.sep)
+    return arg.list.join(sep)
+
+
 @translate.register(ops.Substring)
 def string_substring(op, **kw):
     arg = translate(op.arg, **kw)

ibis/backends/tests/test_string.py

@@ -834,7 +834,7 @@ def test_capitalize(con, inp, expected):
     raises=(com.OperationNotDefinedError, com.UnsupportedBackendType),
 )
 @pytest.mark.notimpl(
-    ["polars", "oracle", "flink"],
+    ["oracle", "flink"],
     raises=com.OperationNotDefinedError,
 )
 def test_array_string_join(con):