Wrap hasColumns (deephaven#4305)

py/server/deephaven/table.py

@@ -570,6 +570,19 @@ def meta_table(self) -> Table:
     def j_object(self) -> jpy.JType:
         return self.j_table
 
+    def has_columns(self, cols: Union[str, Sequence[str]]):
+        """Whether this table contains a column for each of the provided names, return False if any of the columns is
+        not in the table.
+
+        Args:
+            cols (Union[str, Sequence[str]]): the column name(s)
+
+        Returns:
+            bool
+        """
+        cols = to_sequence(cols)
+        return self.j_table.hasColumns(cols)
+
     def attributes(self) -> Dict[str, Any]:
         """Returns all the attributes defined on the table."""
         j_map = jpy.cast(self.j_table, _JAttributeMap).getAttributes()

py/server/tests/test_table.py

@@ -15,7 +15,6 @@
 from deephaven.pandas import to_pandas
 from deephaven.table import Table, SearchDisplayMode
 from deephaven.time import epoch_nanos_to_instant
-from tests.testbase import BaseTestCase
 from tests.testbase import BaseTestCase, table_equals
 
 
@@ -1049,6 +1048,13 @@ def test_agg_with_options(self):
         with self.assertRaises(DHError):
             agg = unique(cols=["ua = a", "ub = b"], include_nulls=True, non_unique_sentinel=None)
 
+    def test_has_columns(self):
+        t = empty_table(1).update(["A=i", "B=i", "C=i"])
+        self.assertTrue(t.has_columns("B"))
+        self.assertTrue(t.has_columns(["A", "C"]))
+        self.assertFalse(t.has_columns("D"))
+        self.assertFalse(t.has_columns(["D", "C"]))
+
 
 if __name__ == "__main__":
     unittest.main()