feat(low-code cdk): add condition to add fields

airbyte_cdk/sources/declarative/declarative_component_schema.yaml

@@ -110,6 +110,19 @@ definitions:
         type: array
         items:
           "$ref": "#/definitions/AddedFieldDefinition"
+      condition:
+        description: Fields will be added if expression is evaluated to True.,
+        type: string
+        default: ""
+        interpolation_context:
+          - config
+          - property
+          - parameters
+        examples:
+          - "{{ property|string == '' }}"
+          - "{{ property is integer }}"
+          - "{{ property|length > 5 }}"
+          - "{{ property == 'some_string_to_match' }}"
       $parameters:
         type: object
         additionalProperties: true

airbyte_cdk/sources/declarative/models/declarative_component_schema.py

@@ -1460,6 +1460,16 @@ class AddFields(BaseModel):
         description="List of transformations (path and corresponding value) that will be added to the record.",
         title="Fields",
     )
+    condition: Optional[str] = Field(
+        "",
+        description="Fields will be added if expression is evaluated to True.,",
+        examples=[
+            "{{ property|string == '' }}",
+            "{{ property is integer }}",
+            "{{ property|length > 5 }}",
+            "{{ property == 'some_string_to_match' }}",
+        ],
+    )
     parameters: Optional[Dict[str, Any]] = Field(None, alias="$parameters")
 
 

airbyte_cdk/sources/declarative/parsers/model_to_component_factory.py

@@ -706,7 +706,11 @@ def create_add_fields(self, model: AddFieldsModel, config: Config, **kwargs: Any
             )
             for added_field_definition_model in model.fields
         ]
-        return AddFields(fields=added_field_definitions, parameters=model.parameters or {})
+        return AddFields(
+            fields=added_field_definitions,
+            condition=model.condition or "",
+            parameters=model.parameters or {},
+        )
 
     def create_keys_to_lower_transformation(
         self, model: KeysToLowerModel, config: Config, **kwargs: Any

airbyte_cdk/sources/declarative/transformations/add_fields.py

@@ -1,12 +1,13 @@
 #
-# Copyright (c) 2023 Airbyte, Inc., all rights reserved.
+# Copyright (c) 2025 Airbyte, Inc., all rights reserved.
 #
 
 from dataclasses import InitVar, dataclass, field
 from typing import Any, Dict, List, Mapping, Optional, Type, Union
 
 import dpath
 
+from airbyte_cdk.sources.declarative.interpolation.interpolated_boolean import InterpolatedBoolean
 from airbyte_cdk.sources.declarative.interpolation.interpolated_string import InterpolatedString
 from airbyte_cdk.sources.declarative.transformations import RecordTransformation
 from airbyte_cdk.sources.types import Config, FieldPointer, StreamSlice, StreamState
@@ -86,11 +87,16 @@ class AddFields(RecordTransformation):
 
     fields: List[AddedFieldDefinition]
     parameters: InitVar[Mapping[str, Any]]
+    condition: str = ""
     _parsed_fields: List[ParsedAddFieldDefinition] = field(
         init=False, repr=False, default_factory=list
     )
 
     def __post_init__(self, parameters: Mapping[str, Any]) -> None:
+        self._filter_interpolator = InterpolatedBoolean(
+            condition=self.condition, parameters=parameters
+        )
+
         for add_field in self.fields:
             if len(add_field.path) < 1:
                 raise ValueError(
@@ -132,7 +138,9 @@ def transform(
         for parsed_field in self._parsed_fields:
             valid_types = (parsed_field.value_type,) if parsed_field.value_type else None
             value = parsed_field.value.eval(config, valid_types=valid_types, **kwargs)
-            dpath.new(record, parsed_field.path, value)
+            is_empty_condition = not self.condition
+            if is_empty_condition or self._filter_interpolator.eval(config, value=value, **kwargs):
+                dpath.new(record, parsed_field.path, value)
 
     def __eq__(self, other: Any) -> bool:
         return bool(self.__dict__ == other.__dict__)

unit_tests/sources/declarative/transformations/test_add_fields.py

@@ -12,12 +12,13 @@
 
 
 @pytest.mark.parametrize(
-    ["input_record", "field", "field_type", "kwargs", "expected"],
+    ["input_record", "field", "field_type", "condition", "kwargs", "expected"],
     [
         pytest.param(
             {"k": "v"},
             [(["path"], "static_value")],
             None,
+            "",
             {},
             {"k": "v", "path": "static_value"},
             id="add new static value",
@@ -26,6 +27,7 @@
             {"k": "v"},
             [(["path"], "{{ 1 }}")],
             None,
+            "",
             {},
             {"k": "v", "path": 1},
             id="add an expression evaluated as a number",
@@ -34,6 +36,7 @@
             {"k": "v"},
             [(["path"], "{{ 1 }}")],
             str,
+            "",
             {},
             {"k": "v", "path": "1"},
             id="add an expression evaluated as a string using the value_type field",
@@ -42,6 +45,7 @@
             {"k": "v"},
             [(["path"], "static_value"), (["path2"], "static_value2")],
             None,
+            "",
             {},
             {"k": "v", "path": "static_value", "path2": "static_value2"},
             id="add new multiple static values",
@@ -50,6 +54,7 @@
             {"k": "v"},
             [(["nested", "path"], "static_value")],
             None,
+            "",
             {},
             {"k": "v", "nested": {"path": "static_value"}},
             id="set static value at nested path",
@@ -58,6 +63,7 @@
             {"k": "v"},
             [(["k"], "new_value")],
             None,
+            "",
             {},
             {"k": "new_value"},
             id="update value which already exists",
@@ -66,6 +72,7 @@
             {"k": [0, 1]},
             [(["k", 3], "v")],
             None,
+            "",
             {},
             {"k": [0, 1, None, "v"]},
             id="Set element inside array",
@@ -74,6 +81,7 @@
             {"k": "v"},
             [(["k2"], '{{ config["shop"] }}')],
             None,
+            "",
             {"config": {"shop": "in-n-out"}},
             {"k": "v", "k2": "in-n-out"},
             id="set a value from the config using bracket notation",
@@ -82,6 +90,7 @@
             {"k": "v"},
             [(["k2"], "{{ config.shop }}")],
             None,
+            "",
             {"config": {"shop": "in-n-out"}},
             {"k": "v", "k2": "in-n-out"},
             id="set a value from the config using dot notation",
@@ -90,6 +99,7 @@
             {"k": "v"},
             [(["k2"], '{{ stream_slice["start_date"] }}')],
             None,
+            "",
             {"stream_slice": {"start_date": "oct1"}},
             {"k": "v", "k2": "oct1"},
             id="set a value from the stream slice using bracket notation",
@@ -98,6 +108,7 @@
             {"k": "v"},
             [(["k2"], "{{ stream_slice.start_date }}")],
             None,
+            "",
             {"stream_slice": {"start_date": "oct1"}},
             {"k": "v", "k2": "oct1"},
             id="set a value from the stream slice using dot notation",
@@ -106,6 +117,7 @@
             {"k": "v"},
             [(["k2"], "{{ record.k }}")],
             None,
+            "",
             {},
             {"k": "v", "k2": "v"},
             id="set a value from a field in the record using dot notation",
@@ -114,6 +126,7 @@
             {"k": "v"},
             [(["k2"], '{{ record["k"] }}')],
             None,
+            "",
             {},
             {"k": "v", "k2": "v"},
             id="set a value from a field in the record using bracket notation",
@@ -122,6 +135,7 @@
             {"k": {"nested": "v"}},
             [(["k2"], "{{ record.k.nested }}")],
             None,
+            "",
             {},
             {"k": {"nested": "v"}, "k2": "v"},
             id="set a value from a nested field in the record using bracket notation",
@@ -130,6 +144,7 @@
             {"k": {"nested": "v"}},
             [(["k2"], '{{ record["k"]["nested"] }}')],
             None,
+            "",
             {},
             {"k": {"nested": "v"}, "k2": "v"},
             id="set a value from a nested field in the record using bracket notation",
@@ -138,22 +153,44 @@
             {"k": "v"},
             [(["k2"], "{{ 2 + 2 }}")],
             None,
+            "",
             {},
             {"k": "v", "k2": 4},
             id="set a value from a jinja expression",
         ),
+        pytest.param(
+            {"k": "v"},
+            [(["path"], "static_value")],
+            None,
+            "{{ False }}",
+            {},
+            {"k": "v"},
+            id="do not add any field if condition is boolean False",
+        ),
+        pytest.param(
+            {"k": "v"},
+            [(["path"], "static_value")],
+            None,
+            "{{ True }}",
+            {},
+            {"k": "v", "path": "static_value"},
+            id="add all fields if condition is boolean True",
+        ),
     ],
 )
 def test_add_fields(
     input_record: Mapping[str, Any],
     field: List[Tuple[FieldPointer, str]],
     field_type: Optional[str],
+    condition: Optional[str],
     kwargs: Mapping[str, Any],
     expected: Mapping[str, Any],
 ):
     inputs = [
         AddedFieldDefinition(path=v[0], value=v[1], value_type=field_type, parameters={})
         for v in field
     ]
-    AddFields(fields=inputs, parameters={"alas": "i live"}).transform(input_record, **kwargs)
+    AddFields(fields=inputs, condition=condition, parameters={"alas": "i live"}).transform(
+        input_record, **kwargs
+    )
     assert input_record == expected