fix(trino): fix integer to timestamp casting

ibis/backends/tests/test_temporal.py

@@ -859,15 +859,15 @@ def test_timestamp_extract_milliseconds_with_big_value(con):
     assert result == 333
 
 
-@pytest.mark.notimpl(["bigquery", "datafusion", "mssql", "trino"])
+@pytest.mark.notimpl(["bigquery", "datafusion", "mssql"])
 def test_integer_cast_to_timestamp_column(backend, alltypes, df):
     expr = alltypes.int_col.cast("timestamp")
     expected = pd.to_datetime(df.int_col, unit="s").rename(expr.get_name())
     result = expr.execute()
     backend.assert_series_equal(result, expected)
 
 
-@pytest.mark.notimpl(["bigquery", "datafusion", "pyspark", "mssql", "trino"])
+@pytest.mark.notimpl(["bigquery", "datafusion", "pyspark", "mssql"])
 def test_integer_cast_to_timestamp_scalar(alltypes, df):
     expr = alltypes.int_col.min().cast("timestamp")
     result = expr.execute()

ibis/backends/trino/compiler.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import sqlalchemy as sa
 from trino.sqlalchemy.datatype import JSON
 from trino.sqlalchemy.dialect import TrinoDialect
 
@@ -14,6 +15,7 @@ class TrinoSQLExprTranslator(AlchemyExprTranslator):
     _rewrites = AlchemyExprTranslator._rewrites.copy()
     _type_map = AlchemyExprTranslator._type_map.copy()
     _has_reduction_filter_syntax = True
+    integer_to_timestamp = sa.func.from_unixtime
     _forbids_frame_clause = (
         *AlchemyExprTranslator._forbids_frame_clause,
         ops.Lead,