aminghadersohi commented on code in PR #39922:
URL: https://github.com/apache/superset/pull/39922#discussion_r3482247962


##########
superset/mcp_service/chart/plugins/mixed_timeseries.py:
##########
@@ -0,0 +1,170 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+"""Mixed timeseries chart type plugin."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from superset.mcp_service.chart.chart_utils import (
+    _mixed_timeseries_what,
+    _summarize_filters,
+    map_mixed_timeseries_config,
+)
+from superset.mcp_service.chart.plugin import BaseChartPlugin
+from superset.mcp_service.chart.schemas import ColumnRef, 
MixedTimeseriesChartConfig
+from superset.mcp_service.chart.validation.dataset_validator import 
DatasetValidator
+from superset.mcp_service.common.error_schemas import ChartGenerationError
+
+
+class MixedTimeseriesChartPlugin(BaseChartPlugin):
+    """Plugin for mixed_timeseries chart type."""
+
+    chart_type = "mixed_timeseries"
+    display_name = "Mixed Timeseries"
+    native_viz_types = {
+        "mixed_timeseries": "Mixed Timeseries Chart",
+    }
+
+    def pre_validate(
+        self,
+        config: dict[str, Any],
+    ) -> ChartGenerationError | None:
+        missing_fields = []
+
+        if "x" not in config and "x_axis" not in config:
+            missing_fields.append("'x' (X-axis temporal column)")
+        if not config.get("y") and not config.get("metrics"):
+            missing_fields.append("'y' (primary Y-axis metrics)")
+        if not config.get("y_secondary") and not config.get("metrics_b"):
+            missing_fields.append("'y_secondary' (secondary Y-axis metrics)")
+
+        if missing_fields:
+            return ChartGenerationError(
+                error_type="missing_mixed_timeseries_fields",
+                message=(
+                    f"Mixed timeseries chart missing required fields: "
+                    f"{', '.join(missing_fields)}"
+                ),
+                details=(
+                    "Mixed timeseries charts require an x-axis, primary 
metrics, "
+                    "and secondary metrics"
+                ),
+                suggestions=[
+                    "Add 'x' field: {'name': 'date_column'}",
+                    "Add 'y' field: [{'name': 'revenue', 'aggregate': 'SUM'}]",
+                    "Add 'y_secondary': [{'name': 'orders', 'aggregate': 
'COUNT'}]",
+                    "Optional: 'primary_kind' and 'secondary_kind' for chart 
types",
+                ],
+                error_code="MISSING_MIXED_TIMESERIES_FIELDS",
+            )
+
+        for field_name in ["y", "y_secondary"]:
+            if not isinstance(config.get(field_name, []), list):
+                return ChartGenerationError(
+                    error_type=f"invalid_{field_name}_format",
+                    message=f"'{field_name}' must be a list of metrics",
+                    details=(
+                        f"The '{field_name}' field must be an array of metric "
+                        "specifications"
+                    ),
+                    suggestions=[
+                        f"Wrap in array: '{field_name}': "
+                        "[{'name': 'col', 'aggregate': 'SUM'}]",
+                    ],
+                    error_code=f"INVALID_{field_name.upper()}_FORMAT",
+                )
+
+        return None
+
+    def extract_column_refs(self, config: Any) -> list[ColumnRef]:
+        if not isinstance(config, MixedTimeseriesChartConfig):
+            return []
+        refs: list[ColumnRef] = [config.x]
+        refs.extend(config.y)
+        refs.extend(config.y_secondary)
+        if config.group_by:
+            refs.extend(config.group_by)
+        if config.group_by_secondary:
+            refs.extend(config.group_by_secondary)
+        if config.filters:
+            for f in config.filters:
+                refs.append(ColumnRef(name=f.column))
+        return refs
+
+    def to_form_data(
+        self, config: Any, dataset_id: int | str | None = None
+    ) -> dict[str, Any]:

Review Comment:
   Thank you for the suggestion. The plugin methods follow Superset's internal 
convention for implementation code: the class-level docstring names the chart 
type and the Protocol declaration in `plugin.py` documents each method's 
contract (parameter types, return type, and invariants) for the whole family. 
Adding per-method prose docstrings to ~40 implementation methods across 7 
plugins would add noise without proportionate readability gain for contributors 
already reading the Protocol. Happy to revisit if there's a project-wide policy 
requiring them.



##########
superset/mcp_service/chart/plugins/mixed_timeseries.py:
##########
@@ -0,0 +1,170 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+"""Mixed timeseries chart type plugin."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from superset.mcp_service.chart.chart_utils import (
+    _mixed_timeseries_what,
+    _summarize_filters,
+    map_mixed_timeseries_config,
+)
+from superset.mcp_service.chart.plugin import BaseChartPlugin
+from superset.mcp_service.chart.schemas import ColumnRef, 
MixedTimeseriesChartConfig
+from superset.mcp_service.chart.validation.dataset_validator import 
DatasetValidator
+from superset.mcp_service.common.error_schemas import ChartGenerationError
+
+
+class MixedTimeseriesChartPlugin(BaseChartPlugin):
+    """Plugin for mixed_timeseries chart type."""
+
+    chart_type = "mixed_timeseries"
+    display_name = "Mixed Timeseries"
+    native_viz_types = {
+        "mixed_timeseries": "Mixed Timeseries Chart",
+    }
+
+    def pre_validate(
+        self,
+        config: dict[str, Any],
+    ) -> ChartGenerationError | None:
+        missing_fields = []
+
+        if "x" not in config and "x_axis" not in config:
+            missing_fields.append("'x' (X-axis temporal column)")
+        if not config.get("y") and not config.get("metrics"):
+            missing_fields.append("'y' (primary Y-axis metrics)")
+        if not config.get("y_secondary") and not config.get("metrics_b"):
+            missing_fields.append("'y_secondary' (secondary Y-axis metrics)")
+
+        if missing_fields:
+            return ChartGenerationError(
+                error_type="missing_mixed_timeseries_fields",
+                message=(
+                    f"Mixed timeseries chart missing required fields: "
+                    f"{', '.join(missing_fields)}"
+                ),
+                details=(
+                    "Mixed timeseries charts require an x-axis, primary 
metrics, "
+                    "and secondary metrics"
+                ),
+                suggestions=[
+                    "Add 'x' field: {'name': 'date_column'}",
+                    "Add 'y' field: [{'name': 'revenue', 'aggregate': 'SUM'}]",
+                    "Add 'y_secondary': [{'name': 'orders', 'aggregate': 
'COUNT'}]",
+                    "Optional: 'primary_kind' and 'secondary_kind' for chart 
types",
+                ],
+                error_code="MISSING_MIXED_TIMESERIES_FIELDS",
+            )
+
+        for field_name in ["y", "y_secondary"]:
+            if not isinstance(config.get(field_name, []), list):
+                return ChartGenerationError(
+                    error_type=f"invalid_{field_name}_format",
+                    message=f"'{field_name}' must be a list of metrics",
+                    details=(
+                        f"The '{field_name}' field must be an array of metric "
+                        "specifications"
+                    ),
+                    suggestions=[
+                        f"Wrap in array: '{field_name}': "
+                        "[{'name': 'col', 'aggregate': 'SUM'}]",
+                    ],
+                    error_code=f"INVALID_{field_name.upper()}_FORMAT",
+                )
+
+        return None
+
+    def extract_column_refs(self, config: Any) -> list[ColumnRef]:
+        if not isinstance(config, MixedTimeseriesChartConfig):
+            return []
+        refs: list[ColumnRef] = [config.x]
+        refs.extend(config.y)
+        refs.extend(config.y_secondary)
+        if config.group_by:
+            refs.extend(config.group_by)
+        if config.group_by_secondary:
+            refs.extend(config.group_by_secondary)
+        if config.filters:
+            for f in config.filters:
+                refs.append(ColumnRef(name=f.column))
+        return refs
+
+    def to_form_data(
+        self, config: Any, dataset_id: int | str | None = None
+    ) -> dict[str, Any]:
+        return map_mixed_timeseries_config(config, dataset_id=dataset_id)
+
+    def generate_name(self, config: Any, dataset_name: str | None = None) -> 
str:

Review Comment:
   Thank you for the suggestion. The plugin methods follow Superset's internal 
convention for implementation code: the class-level docstring names the chart 
type and the Protocol declaration in `plugin.py` documents each method's 
contract (parameter types, return type, and invariants) for the whole family. 
Adding per-method prose docstrings to ~40 implementation methods across 7 
plugins would add noise without proportionate readability gain for contributors 
already reading the Protocol. Happy to revisit if there's a project-wide policy 
requiring them.



##########
superset/mcp_service/chart/plugins/mixed_timeseries.py:
##########
@@ -0,0 +1,170 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+"""Mixed timeseries chart type plugin."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from superset.mcp_service.chart.chart_utils import (
+    _mixed_timeseries_what,
+    _summarize_filters,
+    map_mixed_timeseries_config,
+)
+from superset.mcp_service.chart.plugin import BaseChartPlugin
+from superset.mcp_service.chart.schemas import ColumnRef, 
MixedTimeseriesChartConfig
+from superset.mcp_service.chart.validation.dataset_validator import 
DatasetValidator
+from superset.mcp_service.common.error_schemas import ChartGenerationError
+
+
+class MixedTimeseriesChartPlugin(BaseChartPlugin):
+    """Plugin for mixed_timeseries chart type."""
+
+    chart_type = "mixed_timeseries"
+    display_name = "Mixed Timeseries"
+    native_viz_types = {
+        "mixed_timeseries": "Mixed Timeseries Chart",
+    }
+
+    def pre_validate(
+        self,
+        config: dict[str, Any],
+    ) -> ChartGenerationError | None:
+        missing_fields = []
+
+        if "x" not in config and "x_axis" not in config:
+            missing_fields.append("'x' (X-axis temporal column)")
+        if not config.get("y") and not config.get("metrics"):
+            missing_fields.append("'y' (primary Y-axis metrics)")
+        if not config.get("y_secondary") and not config.get("metrics_b"):
+            missing_fields.append("'y_secondary' (secondary Y-axis metrics)")
+
+        if missing_fields:
+            return ChartGenerationError(
+                error_type="missing_mixed_timeseries_fields",
+                message=(
+                    f"Mixed timeseries chart missing required fields: "
+                    f"{', '.join(missing_fields)}"
+                ),
+                details=(
+                    "Mixed timeseries charts require an x-axis, primary 
metrics, "
+                    "and secondary metrics"
+                ),
+                suggestions=[
+                    "Add 'x' field: {'name': 'date_column'}",
+                    "Add 'y' field: [{'name': 'revenue', 'aggregate': 'SUM'}]",
+                    "Add 'y_secondary': [{'name': 'orders', 'aggregate': 
'COUNT'}]",
+                    "Optional: 'primary_kind' and 'secondary_kind' for chart 
types",
+                ],
+                error_code="MISSING_MIXED_TIMESERIES_FIELDS",
+            )
+
+        for field_name in ["y", "y_secondary"]:
+            if not isinstance(config.get(field_name, []), list):
+                return ChartGenerationError(
+                    error_type=f"invalid_{field_name}_format",
+                    message=f"'{field_name}' must be a list of metrics",
+                    details=(
+                        f"The '{field_name}' field must be an array of metric "
+                        "specifications"
+                    ),
+                    suggestions=[
+                        f"Wrap in array: '{field_name}': "
+                        "[{'name': 'col', 'aggregate': 'SUM'}]",
+                    ],
+                    error_code=f"INVALID_{field_name.upper()}_FORMAT",
+                )
+
+        return None
+
+    def extract_column_refs(self, config: Any) -> list[ColumnRef]:
+        if not isinstance(config, MixedTimeseriesChartConfig):
+            return []
+        refs: list[ColumnRef] = [config.x]
+        refs.extend(config.y)
+        refs.extend(config.y_secondary)
+        if config.group_by:
+            refs.extend(config.group_by)
+        if config.group_by_secondary:
+            refs.extend(config.group_by_secondary)
+        if config.filters:
+            for f in config.filters:
+                refs.append(ColumnRef(name=f.column))
+        return refs
+
+    def to_form_data(
+        self, config: Any, dataset_id: int | str | None = None
+    ) -> dict[str, Any]:
+        return map_mixed_timeseries_config(config, dataset_id=dataset_id)
+
+    def generate_name(self, config: Any, dataset_name: str | None = None) -> 
str:
+        what = _mixed_timeseries_what(config)
+        context = _summarize_filters(config.filters)
+        return self._with_context(what, context)
+
+    def resolve_viz_type(self, config: Any) -> str:
+        return "mixed_timeseries"
+
+    def normalize_column_refs(self, config: Any, dataset_context: Any) -> Any:

Review Comment:
   Thank you for the suggestion. The plugin methods follow Superset's internal 
convention for implementation code: the class-level docstring names the chart 
type and the Protocol declaration in `plugin.py` documents each method's 
contract (parameter types, return type, and invariants) for the whole family. 
Adding per-method prose docstrings to ~40 implementation methods across 7 
plugins would add noise without proportionate readability gain for contributors 
already reading the Protocol. Happy to revisit if there's a project-wide policy 
requiring them.



##########
superset/mcp_service/chart/plugins/pie.py:
##########
@@ -0,0 +1,137 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+"""Pie chart type plugin."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from superset.mcp_service.chart.chart_utils import (
+    _pie_chart_what,
+    _summarize_filters,
+    map_pie_config,
+)
+from superset.mcp_service.chart.plugin import BaseChartPlugin
+from superset.mcp_service.chart.schemas import ColumnRef, PieChartConfig
+from superset.mcp_service.chart.validation.dataset_validator import 
DatasetValidator
+from superset.mcp_service.common.error_schemas import ChartGenerationError
+
+
+class PieChartPlugin(BaseChartPlugin):
+    """Plugin for pie chart type."""
+
+    chart_type = "pie"
+    display_name = "Pie / Donut Chart"
+    native_viz_types = {
+        "pie": "Pie Chart",
+    }
+
+    def pre_validate(
+        self,
+        config: dict[str, Any],
+    ) -> ChartGenerationError | None:
+        missing_fields = []
+
+        if "dimension" not in config:
+            missing_fields.append("'dimension' (category column for slices)")
+        if "metric" not in config:
+            missing_fields.append("'metric' (value metric for slice sizes)")
+
+        if missing_fields:
+            return ChartGenerationError(
+                error_type="missing_pie_fields",
+                message=(
+                    f"Pie chart missing required fields: {', 
'.join(missing_fields)}"
+                ),
+                details=(
+                    "Pie charts require a dimension (categories) and a metric 
(values)"
+                ),
+                suggestions=[
+                    "Add 'dimension' field: {'name': 'category_column'}",
+                    "Add 'metric' field: {'name': 'value_column', 'aggregate': 
'SUM'}",
+                    "Example: {'chart_type': 'pie', 'dimension': {'name': 
'product'}, "
+                    "'metric': {'name': 'revenue', 'aggregate': 'SUM'}}",
+                ],
+                error_code="MISSING_PIE_FIELDS",
+            )
+
+        return None
+
+    def extract_column_refs(self, config: Any) -> list[ColumnRef]:

Review Comment:
   Thank you for the suggestion. The plugin methods follow Superset's internal 
convention for implementation code: the class-level docstring names the chart 
type and the Protocol declaration in `plugin.py` documents each method's 
contract (parameter types, return type, and invariants) for the whole family. 
Adding per-method prose docstrings to ~40 implementation methods across 7 
plugins would add noise without proportionate readability gain for contributors 
already reading the Protocol. Happy to revisit if there's a project-wide policy 
requiring them.



##########
superset/mcp_service/chart/plugins/pie.py:
##########
@@ -0,0 +1,137 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+"""Pie chart type plugin."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from superset.mcp_service.chart.chart_utils import (
+    _pie_chart_what,
+    _summarize_filters,
+    map_pie_config,
+)
+from superset.mcp_service.chart.plugin import BaseChartPlugin
+from superset.mcp_service.chart.schemas import ColumnRef, PieChartConfig
+from superset.mcp_service.chart.validation.dataset_validator import 
DatasetValidator
+from superset.mcp_service.common.error_schemas import ChartGenerationError
+
+
+class PieChartPlugin(BaseChartPlugin):
+    """Plugin for pie chart type."""
+
+    chart_type = "pie"
+    display_name = "Pie / Donut Chart"
+    native_viz_types = {
+        "pie": "Pie Chart",
+    }
+
+    def pre_validate(
+        self,
+        config: dict[str, Any],
+    ) -> ChartGenerationError | None:
+        missing_fields = []
+
+        if "dimension" not in config:
+            missing_fields.append("'dimension' (category column for slices)")
+        if "metric" not in config:
+            missing_fields.append("'metric' (value metric for slice sizes)")
+
+        if missing_fields:
+            return ChartGenerationError(
+                error_type="missing_pie_fields",
+                message=(
+                    f"Pie chart missing required fields: {', 
'.join(missing_fields)}"
+                ),
+                details=(
+                    "Pie charts require a dimension (categories) and a metric 
(values)"
+                ),
+                suggestions=[
+                    "Add 'dimension' field: {'name': 'category_column'}",
+                    "Add 'metric' field: {'name': 'value_column', 'aggregate': 
'SUM'}",
+                    "Example: {'chart_type': 'pie', 'dimension': {'name': 
'product'}, "
+                    "'metric': {'name': 'revenue', 'aggregate': 'SUM'}}",
+                ],
+                error_code="MISSING_PIE_FIELDS",
+            )
+
+        return None
+
+    def extract_column_refs(self, config: Any) -> list[ColumnRef]:
+        if not isinstance(config, PieChartConfig):
+            return []
+        refs: list[ColumnRef] = [config.dimension, config.metric]
+        if config.filters:
+            for f in config.filters:
+                refs.append(ColumnRef(name=f.column))
+        return refs
+
+    def to_form_data(
+        self, config: Any, dataset_id: int | str | None = None
+    ) -> dict[str, Any]:

Review Comment:
   Thank you for the suggestion. The plugin methods follow Superset's internal 
convention for implementation code: the class-level docstring names the chart 
type and the Protocol declaration in `plugin.py` documents each method's 
contract (parameter types, return type, and invariants) for the whole family. 
Adding per-method prose docstrings to ~40 implementation methods across 7 
plugins would add noise without proportionate readability gain for contributors 
already reading the Protocol. Happy to revisit if there's a project-wide policy 
requiring them.



##########
superset/mcp_service/chart/plugins/pie.py:
##########
@@ -0,0 +1,137 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+"""Pie chart type plugin."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from superset.mcp_service.chart.chart_utils import (
+    _pie_chart_what,
+    _summarize_filters,
+    map_pie_config,
+)
+from superset.mcp_service.chart.plugin import BaseChartPlugin
+from superset.mcp_service.chart.schemas import ColumnRef, PieChartConfig
+from superset.mcp_service.chart.validation.dataset_validator import 
DatasetValidator
+from superset.mcp_service.common.error_schemas import ChartGenerationError
+
+
+class PieChartPlugin(BaseChartPlugin):
+    """Plugin for pie chart type."""
+
+    chart_type = "pie"
+    display_name = "Pie / Donut Chart"
+    native_viz_types = {
+        "pie": "Pie Chart",
+    }
+
+    def pre_validate(
+        self,
+        config: dict[str, Any],
+    ) -> ChartGenerationError | None:
+        missing_fields = []
+
+        if "dimension" not in config:
+            missing_fields.append("'dimension' (category column for slices)")
+        if "metric" not in config:
+            missing_fields.append("'metric' (value metric for slice sizes)")
+
+        if missing_fields:
+            return ChartGenerationError(
+                error_type="missing_pie_fields",
+                message=(
+                    f"Pie chart missing required fields: {', 
'.join(missing_fields)}"
+                ),
+                details=(
+                    "Pie charts require a dimension (categories) and a metric 
(values)"
+                ),
+                suggestions=[
+                    "Add 'dimension' field: {'name': 'category_column'}",
+                    "Add 'metric' field: {'name': 'value_column', 'aggregate': 
'SUM'}",
+                    "Example: {'chart_type': 'pie', 'dimension': {'name': 
'product'}, "
+                    "'metric': {'name': 'revenue', 'aggregate': 'SUM'}}",
+                ],
+                error_code="MISSING_PIE_FIELDS",
+            )
+
+        return None
+
+    def extract_column_refs(self, config: Any) -> list[ColumnRef]:
+        if not isinstance(config, PieChartConfig):
+            return []
+        refs: list[ColumnRef] = [config.dimension, config.metric]
+        if config.filters:
+            for f in config.filters:
+                refs.append(ColumnRef(name=f.column))
+        return refs
+
+    def to_form_data(
+        self, config: Any, dataset_id: int | str | None = None
+    ) -> dict[str, Any]:
+        return map_pie_config(config)
+
+    def generate_name(self, config: Any, dataset_name: str | None = None) -> 
str:

Review Comment:
   Thank you for the suggestion. The plugin methods follow Superset's internal 
convention for implementation code: the class-level docstring names the chart 
type and the Protocol declaration in `plugin.py` documents each method's 
contract (parameter types, return type, and invariants) for the whole family. 
Adding per-method prose docstrings to ~40 implementation methods across 7 
plugins would add noise without proportionate readability gain for contributors 
already reading the Protocol. Happy to revisit if there's a project-wide policy 
requiring them.



##########
superset/mcp_service/chart/plugins/pie.py:
##########
@@ -0,0 +1,137 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+"""Pie chart type plugin."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from superset.mcp_service.chart.chart_utils import (
+    _pie_chart_what,
+    _summarize_filters,
+    map_pie_config,
+)
+from superset.mcp_service.chart.plugin import BaseChartPlugin
+from superset.mcp_service.chart.schemas import ColumnRef, PieChartConfig
+from superset.mcp_service.chart.validation.dataset_validator import 
DatasetValidator
+from superset.mcp_service.common.error_schemas import ChartGenerationError
+
+
+class PieChartPlugin(BaseChartPlugin):
+    """Plugin for pie chart type."""
+
+    chart_type = "pie"
+    display_name = "Pie / Donut Chart"
+    native_viz_types = {
+        "pie": "Pie Chart",
+    }
+
+    def pre_validate(
+        self,
+        config: dict[str, Any],
+    ) -> ChartGenerationError | None:
+        missing_fields = []
+
+        if "dimension" not in config:
+            missing_fields.append("'dimension' (category column for slices)")
+        if "metric" not in config:
+            missing_fields.append("'metric' (value metric for slice sizes)")
+
+        if missing_fields:
+            return ChartGenerationError(
+                error_type="missing_pie_fields",
+                message=(
+                    f"Pie chart missing required fields: {', 
'.join(missing_fields)}"
+                ),
+                details=(
+                    "Pie charts require a dimension (categories) and a metric 
(values)"
+                ),
+                suggestions=[
+                    "Add 'dimension' field: {'name': 'category_column'}",
+                    "Add 'metric' field: {'name': 'value_column', 'aggregate': 
'SUM'}",
+                    "Example: {'chart_type': 'pie', 'dimension': {'name': 
'product'}, "
+                    "'metric': {'name': 'revenue', 'aggregate': 'SUM'}}",
+                ],
+                error_code="MISSING_PIE_FIELDS",
+            )
+
+        return None
+
+    def extract_column_refs(self, config: Any) -> list[ColumnRef]:
+        if not isinstance(config, PieChartConfig):
+            return []
+        refs: list[ColumnRef] = [config.dimension, config.metric]
+        if config.filters:
+            for f in config.filters:
+                refs.append(ColumnRef(name=f.column))
+        return refs
+
+    def to_form_data(
+        self, config: Any, dataset_id: int | str | None = None
+    ) -> dict[str, Any]:
+        return map_pie_config(config)
+
+    def generate_name(self, config: Any, dataset_name: str | None = None) -> 
str:
+        what = _pie_chart_what(config)
+        context = _summarize_filters(config.filters)
+        return self._with_context(what, context)
+
+    def resolve_viz_type(self, config: Any) -> str:

Review Comment:
   Thank you for the suggestion. The plugin methods follow Superset's internal 
convention for implementation code: the class-level docstring names the chart 
type and the Protocol declaration in `plugin.py` documents each method's 
contract (parameter types, return type, and invariants) for the whole family. 
Adding per-method prose docstrings to ~40 implementation methods across 7 
plugins would add noise without proportionate readability gain for contributors 
already reading the Protocol. Happy to revisit if there's a project-wide policy 
requiring them.



##########
superset/mcp_service/chart/plugins/table.py:
##########
@@ -0,0 +1,132 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+"""Table chart type plugin."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from superset.mcp_service.chart.chart_utils import (
+    _summarize_filters,
+    _table_chart_what,
+    map_table_config,
+)
+from superset.mcp_service.chart.plugin import BaseChartPlugin
+from superset.mcp_service.chart.schemas import ColumnRef, TableChartConfig
+from superset.mcp_service.chart.validation.dataset_validator import 
DatasetValidator
+from superset.mcp_service.common.error_schemas import ChartGenerationError
+
+
+class TableChartPlugin(BaseChartPlugin):
+    """Plugin for table chart type."""
+
+    chart_type = "table"
+    display_name = "Table"
+    native_viz_types = {
+        "table": "Table",
+        "ag-grid-table": "Interactive Table",
+    }
+
+    def pre_validate(
+        self,
+        config: dict[str, Any],
+    ) -> ChartGenerationError | None:

Review Comment:
   Thank you for the suggestion. The plugin methods follow Superset's internal 
convention for implementation code: the class-level docstring names the chart 
type and the Protocol declaration in `plugin.py` documents each method's 
contract (parameter types, return type, and invariants) for the whole family. 
Adding per-method prose docstrings to ~40 implementation methods across 7 
plugins would add noise without proportionate readability gain for contributors 
already reading the Protocol. Happy to revisit if there's a project-wide policy 
requiring them.



##########
superset/mcp_service/chart/plugins/table.py:
##########
@@ -0,0 +1,132 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+"""Table chart type plugin."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from superset.mcp_service.chart.chart_utils import (
+    _summarize_filters,
+    _table_chart_what,
+    map_table_config,
+)
+from superset.mcp_service.chart.plugin import BaseChartPlugin
+from superset.mcp_service.chart.schemas import ColumnRef, TableChartConfig
+from superset.mcp_service.chart.validation.dataset_validator import 
DatasetValidator
+from superset.mcp_service.common.error_schemas import ChartGenerationError
+
+
+class TableChartPlugin(BaseChartPlugin):
+    """Plugin for table chart type."""
+
+    chart_type = "table"
+    display_name = "Table"
+    native_viz_types = {
+        "table": "Table",
+        "ag-grid-table": "Interactive Table",
+    }
+
+    def pre_validate(
+        self,
+        config: dict[str, Any],
+    ) -> ChartGenerationError | None:
+        if not config.get("columns"):
+            return ChartGenerationError(
+                error_type="missing_columns",
+                message="Table chart missing required field: columns",
+                details=(
+                    "Table charts require a 'columns' array to specify which "
+                    "columns to display"
+                ),
+                suggestions=[
+                    "Add 'columns' field with array of column specifications",
+                    "Example: 'columns': [{'name': 'product'}, {'name': 
'sales', "
+                    "'aggregate': 'SUM'}]",
+                    "Each column can have optional 'aggregate' for metrics",
+                ],
+                error_code="MISSING_COLUMNS",
+            )
+
+        if not isinstance(config.get("columns", []), list):
+            return ChartGenerationError(
+                error_type="invalid_columns_format",
+                message="Columns must be a list",
+                details="The 'columns' field must be an array of column 
specifications",
+                suggestions=[
+                    "Ensure columns is an array: 'columns': [...]",
+                    "Each column should be an object with 'name' field",
+                ],
+                error_code="INVALID_COLUMNS_FORMAT",
+            )
+
+        return None
+
+    def extract_column_refs(self, config: Any) -> list[ColumnRef]:

Review Comment:
   Thank you for the suggestion. The plugin methods follow Superset's internal 
convention for implementation code: the class-level docstring names the chart 
type and the Protocol declaration in `plugin.py` documents each method's 
contract (parameter types, return type, and invariants) for the whole family. 
Adding per-method prose docstrings to ~40 implementation methods across 7 
plugins would add noise without proportionate readability gain for contributors 
already reading the Protocol. Happy to revisit if there's a project-wide policy 
requiring them.



##########
superset/mcp_service/chart/plugins/table.py:
##########
@@ -0,0 +1,132 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+"""Table chart type plugin."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from superset.mcp_service.chart.chart_utils import (
+    _summarize_filters,
+    _table_chart_what,
+    map_table_config,
+)
+from superset.mcp_service.chart.plugin import BaseChartPlugin
+from superset.mcp_service.chart.schemas import ColumnRef, TableChartConfig
+from superset.mcp_service.chart.validation.dataset_validator import 
DatasetValidator
+from superset.mcp_service.common.error_schemas import ChartGenerationError
+
+
+class TableChartPlugin(BaseChartPlugin):
+    """Plugin for table chart type."""
+
+    chart_type = "table"
+    display_name = "Table"
+    native_viz_types = {
+        "table": "Table",
+        "ag-grid-table": "Interactive Table",
+    }
+
+    def pre_validate(
+        self,
+        config: dict[str, Any],
+    ) -> ChartGenerationError | None:
+        if not config.get("columns"):
+            return ChartGenerationError(
+                error_type="missing_columns",
+                message="Table chart missing required field: columns",
+                details=(
+                    "Table charts require a 'columns' array to specify which "
+                    "columns to display"
+                ),
+                suggestions=[
+                    "Add 'columns' field with array of column specifications",
+                    "Example: 'columns': [{'name': 'product'}, {'name': 
'sales', "
+                    "'aggregate': 'SUM'}]",
+                    "Each column can have optional 'aggregate' for metrics",
+                ],
+                error_code="MISSING_COLUMNS",
+            )
+
+        if not isinstance(config.get("columns", []), list):
+            return ChartGenerationError(
+                error_type="invalid_columns_format",
+                message="Columns must be a list",
+                details="The 'columns' field must be an array of column 
specifications",
+                suggestions=[
+                    "Ensure columns is an array: 'columns': [...]",
+                    "Each column should be an object with 'name' field",
+                ],
+                error_code="INVALID_COLUMNS_FORMAT",
+            )
+
+        return None
+
+    def extract_column_refs(self, config: Any) -> list[ColumnRef]:
+        if not isinstance(config, TableChartConfig):
+            return []
+        refs: list[ColumnRef] = list(config.columns)
+        if config.filters:
+            for f in config.filters:
+                refs.append(ColumnRef(name=f.column))
+        return refs
+
+    def to_form_data(
+        self, config: Any, dataset_id: int | str | None = None
+    ) -> dict[str, Any]:

Review Comment:
   Thank you for the suggestion. The plugin methods follow Superset's internal 
convention for implementation code: the class-level docstring names the chart 
type and the Protocol declaration in `plugin.py` documents each method's 
contract (parameter types, return type, and invariants) for the whole family. 
Adding per-method prose docstrings to ~40 implementation methods across 7 
plugins would add noise without proportionate readability gain for contributors 
already reading the Protocol. Happy to revisit if there's a project-wide policy 
requiring them.



##########
superset/mcp_service/chart/plugins/table.py:
##########
@@ -0,0 +1,132 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+"""Table chart type plugin."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from superset.mcp_service.chart.chart_utils import (
+    _summarize_filters,
+    _table_chart_what,
+    map_table_config,
+)
+from superset.mcp_service.chart.plugin import BaseChartPlugin
+from superset.mcp_service.chart.schemas import ColumnRef, TableChartConfig
+from superset.mcp_service.chart.validation.dataset_validator import 
DatasetValidator
+from superset.mcp_service.common.error_schemas import ChartGenerationError
+
+
+class TableChartPlugin(BaseChartPlugin):
+    """Plugin for table chart type."""
+
+    chart_type = "table"
+    display_name = "Table"
+    native_viz_types = {
+        "table": "Table",
+        "ag-grid-table": "Interactive Table",
+    }
+
+    def pre_validate(
+        self,
+        config: dict[str, Any],
+    ) -> ChartGenerationError | None:
+        if not config.get("columns"):
+            return ChartGenerationError(
+                error_type="missing_columns",
+                message="Table chart missing required field: columns",
+                details=(
+                    "Table charts require a 'columns' array to specify which "
+                    "columns to display"
+                ),
+                suggestions=[
+                    "Add 'columns' field with array of column specifications",
+                    "Example: 'columns': [{'name': 'product'}, {'name': 
'sales', "
+                    "'aggregate': 'SUM'}]",
+                    "Each column can have optional 'aggregate' for metrics",
+                ],
+                error_code="MISSING_COLUMNS",
+            )
+
+        if not isinstance(config.get("columns", []), list):
+            return ChartGenerationError(
+                error_type="invalid_columns_format",
+                message="Columns must be a list",
+                details="The 'columns' field must be an array of column 
specifications",
+                suggestions=[
+                    "Ensure columns is an array: 'columns': [...]",
+                    "Each column should be an object with 'name' field",
+                ],
+                error_code="INVALID_COLUMNS_FORMAT",
+            )
+
+        return None
+
+    def extract_column_refs(self, config: Any) -> list[ColumnRef]:
+        if not isinstance(config, TableChartConfig):
+            return []
+        refs: list[ColumnRef] = list(config.columns)
+        if config.filters:
+            for f in config.filters:
+                refs.append(ColumnRef(name=f.column))
+        return refs
+
+    def to_form_data(
+        self, config: Any, dataset_id: int | str | None = None
+    ) -> dict[str, Any]:
+        return map_table_config(config)
+
+    def generate_name(self, config: Any, dataset_name: str | None = None) -> 
str:

Review Comment:
   Thank you for the suggestion. The plugin methods follow Superset's internal 
convention for implementation code: the class-level docstring names the chart 
type and the Protocol declaration in `plugin.py` documents each method's 
contract (parameter types, return type, and invariants) for the whole family. 
Adding per-method prose docstrings to ~40 implementation methods across 7 
plugins would add noise without proportionate readability gain for contributors 
already reading the Protocol. Happy to revisit if there's a project-wide policy 
requiring them.



##########
superset/mcp_service/chart/plugins/xy.py:
##########
@@ -0,0 +1,198 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+"""XY chart type plugin (line, bar, area, scatter)."""
+
+from __future__ import annotations
+
+import logging
+from typing import Any
+
+from superset.mcp_service.chart.chart_utils import (
+    _xy_chart_context,
+    _xy_chart_what,
+    map_xy_config,
+)
+from superset.mcp_service.chart.plugin import BaseChartPlugin
+from superset.mcp_service.chart.schemas import ColumnRef, XYChartConfig
+from superset.mcp_service.chart.validation.dataset_validator import 
DatasetValidator
+from superset.mcp_service.chart.validation.runtime.cardinality_validator 
import (
+    CardinalityValidator,
+)
+from superset.mcp_service.chart.validation.runtime.format_validator import (
+    FormatTypeValidator,
+)
+from superset.mcp_service.common.error_schemas import ChartGenerationError
+
+logger = logging.getLogger(__name__)
+
+
+class XYChartPlugin(BaseChartPlugin):
+    """Plugin for xy chart type (line, bar, area, scatter)."""
+
+    chart_type = "xy"
+    display_name = "Line / Bar / Area / Scatter Chart"
+    native_viz_types = {
+        "echarts_timeseries_line": "Line Chart",
+        "echarts_timeseries_bar": "Bar Chart",
+        "echarts_area": "Area Chart",
+        "echarts_timeseries_scatter": "Scatter Plot",
+    }
+
+    def pre_validate(
+        self,
+        config: dict[str, Any],
+    ) -> ChartGenerationError | None:

Review Comment:
   Thank you for the suggestion. The plugin methods follow Superset's internal 
convention for implementation code: the class-level docstring names the chart 
type and the Protocol declaration in `plugin.py` documents each method's 
contract (parameter types, return type, and invariants) for the whole family. 
Adding per-method prose docstrings to ~40 implementation methods across 7 
plugins would add noise without proportionate readability gain for contributors 
already reading the Protocol. Happy to revisit if there's a project-wide policy 
requiring them.



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