rusackas commented on code in PR #41946:
URL: https://github.com/apache/superset/pull/41946#discussion_r3565305641
##########
tests/unit_tests/connectors/sqla/models_test.py:
##########
@@ -542,6 +542,91 @@ def
test_fetch_metadata_with_comment_field_existing_columns(
assert columns_by_name["name"].description == "Updated name description"
+def test_fetch_metadata_sets_expression_for_expanded_nested_columns(
+ mocker: MockerFixture,
+) -> None:
+ """
+ Test that fetch_metadata uses the `expression` hint provided by the db
engine
+ spec (e.g. Trino's expansion of nested `ROW` columns via `expand_rows`) to
set
+ the physical `TableColumn.expression`.
+
+ Without this, a nested column like `metadata.uuid` would have no
expression,
+ causing SQLAlchemy to render the whole dotted `column_name` as a single
quoted
+ identifier (`"metadata.uuid"`), which Trino rejects, instead of the correct
+ per-segment quoting (`"metadata"."uuid"`).
+
+ See: https://github.com/apache/superset/issues/27034
+ """
+ # Mock database
+ database = mocker.MagicMock()
+ database.get_metrics.return_value = []
+
+ # Mock db_engine_spec
+ mock_db_engine_spec = mocker.MagicMock()
+ mock_db_engine_spec.alter_new_orm_column = mocker.MagicMock()
+ database.db_engine_spec = mock_db_engine_spec
+
+ # Create table with a pre-existing (already synced) expanded column, to
also
+ # cover the "sync columns from source" (re-fetch) code path
+ table = SqlaTable(table_name="test_table_nested", database=database)
Review Comment:
Added the type annotation.
##########
tests/unit_tests/connectors/sqla/models_test.py:
##########
@@ -542,6 +542,91 @@ def
test_fetch_metadata_with_comment_field_existing_columns(
assert columns_by_name["name"].description == "Updated name description"
+def test_fetch_metadata_sets_expression_for_expanded_nested_columns(
+ mocker: MockerFixture,
+) -> None:
+ """
+ Test that fetch_metadata uses the `expression` hint provided by the db
engine
+ spec (e.g. Trino's expansion of nested `ROW` columns via `expand_rows`) to
set
+ the physical `TableColumn.expression`.
+
+ Without this, a nested column like `metadata.uuid` would have no
expression,
+ causing SQLAlchemy to render the whole dotted `column_name` as a single
quoted
+ identifier (`"metadata.uuid"`), which Trino rejects, instead of the correct
+ per-segment quoting (`"metadata"."uuid"`).
+
+ See: https://github.com/apache/superset/issues/27034
+ """
+ # Mock database
+ database = mocker.MagicMock()
+ database.get_metrics.return_value = []
+
+ # Mock db_engine_spec
+ mock_db_engine_spec = mocker.MagicMock()
+ mock_db_engine_spec.alter_new_orm_column = mocker.MagicMock()
+ database.db_engine_spec = mock_db_engine_spec
+
+ # Create table with a pre-existing (already synced) expanded column, to
also
+ # cover the "sync columns from source" (re-fetch) code path
+ table = SqlaTable(table_name="test_table_nested", database=database)
+ table.id = 1
+
+ existing_col = TableColumn(
+ column_name="metadata.uuid",
+ type="VARCHAR",
+ table=table,
+ expression="",
+ )
Review Comment:
Added the type annotation.
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