test: xfail risingwave, postgres, and flink

ibis/backends/tests/errors.py

@@ -103,6 +103,7 @@
     TrinoUserError = None
 
 try:
+    from psycopg2.errors import ArraySubscriptError as PsycoPg2ArraySubscriptError
     from psycopg2.errors import DivisionByZero as PsycoPg2DivisionByZero
     from psycopg2.errors import IndeterminateDatatype as PsycoPg2IndeterminateDatatype
     from psycopg2.errors import InternalError_ as PsycoPg2InternalError
@@ -118,7 +119,7 @@
         PsycoPg2InvalidTextRepresentation
     ) = PsycoPg2DivisionByZero = PsycoPg2InternalError = PsycoPg2ProgrammingError = (
         PsycoPg2OperationalError
-    ) = PsycoPg2UndefinedObject = None
+    ) = PsycoPg2UndefinedObject = PsycoPg2ArraySubscriptError = None
 
 try:
     from MySQLdb import NotSupportedError as MySQLNotSupportedError

ibis/backends/tests/test_array.py

@@ -21,6 +21,7 @@
     GoogleBadRequest,
     MySQLOperationalError,
     PolarsComputeError,
+    PsycoPg2ArraySubscriptError,
     PsycoPg2IndeterminateDatatype,
     PsycoPg2InternalError,
     PsycoPg2ProgrammingError,
@@ -1564,6 +1565,12 @@ def test_array_agg_bool(con, data, agg, baseline_func):
     assert result == expected
 
 
+@pytest.mark.notyet(
+    ["postgres"],
+    raises=PsycoPg2ArraySubscriptError,
+    reason="all dimensions must match in size",
+)
+@pytest.mark.notimpl(["risingwave", "flink"], raises=com.OperationNotDefinedError)
 def test_flatten(con):
     t = ibis.memtable(
         [{"arr": [[1, 5, 7], [3, 4]]}], schema={"arr": "array<array<int64>>"}