Issue 28893/infer schema csv (airbytehq#29099)

airbyte-cdk/python/airbyte_cdk/sources/file_based/availability_strategy/default_file_based_availability_strategy.py

@@ -82,7 +82,7 @@ def _check_parse_record(self, stream: "AbstractFileBasedStream", file: RemoteFil
         parser = stream.get_parser(stream.config.file_type)
 
         try:
-            record = next(iter(parser.parse_records(stream.config, file, self.stream_reader, logger)))
+            record = next(iter(parser.parse_records(stream.config, file, self.stream_reader, logger, discovered_schema=None)))
         except StopIteration:
             # The file is empty. We've verified that we can open it, so will
             # consider the connection check successful even though it means

airbyte-cdk/python/airbyte_cdk/sources/file_based/config/csv_format.py

@@ -17,6 +17,11 @@ class QuotingBehavior(Enum):
     QUOTE_NONE = "Quote None"
 
 
+class InferenceType(Enum):
+    NONE = "None"
+    PRIMITIVE_TYPES_ONLY = "Primitive Types Only"
+
+
 DEFAULT_TRUE_VALUES = ["y", "yes", "t", "true", "on", "1"]
 DEFAULT_FALSE_VALUES = ["n", "no", "f", "false", "off", "0"]
 
@@ -81,6 +86,12 @@ class Config:
         default=DEFAULT_FALSE_VALUES,
         description="A set of case-sensitive strings that should be interpreted as false values.",
     )
+    inference_type: InferenceType = Field(
+        title="Inference Type",
+        default=InferenceType.NONE,
+        description="How to infer the types of the columns. If none, inference default to strings.",
+        airbyte_hidden=True,
+    )
 
     @validator("delimiter")
     def validate_delimiter(cls, v: str) -> str:

airbyte-cdk/python/airbyte_cdk/sources/file_based/file_types/avro_parser.py

@@ -4,14 +4,15 @@
 
 import logging
 import uuid
-from typing import Any, Dict, Iterable, Mapping
+from typing import Any, Dict, Iterable, Mapping, Optional
 
 import fastavro
 from airbyte_cdk.sources.file_based.config.avro_format import AvroFormat
 from airbyte_cdk.sources.file_based.config.file_based_stream_config import FileBasedStreamConfig
 from airbyte_cdk.sources.file_based.file_based_stream_reader import AbstractFileBasedStreamReader, FileReadMode
 from airbyte_cdk.sources.file_based.file_types.file_type_parser import FileTypeParser
 from airbyte_cdk.sources.file_based.remote_file import RemoteFile
+from airbyte_cdk.sources.file_based.schema_helpers import SchemaType
 
 AVRO_TYPE_TO_JSON_TYPE = {
     "null": "null",
@@ -47,7 +48,7 @@ async def infer_schema(
         file: RemoteFile,
         stream_reader: AbstractFileBasedStreamReader,
         logger: logging.Logger,
-    ) -> Dict[str, Any]:
+    ) -> SchemaType:
         avro_format = config.format or AvroFormat()
         if not isinstance(avro_format, AvroFormat):
             raise ValueError(f"Expected ParquetFormat, got {avro_format}")
@@ -132,6 +133,7 @@ def parse_records(
         file: RemoteFile,
         stream_reader: AbstractFileBasedStreamReader,
         logger: logging.Logger,
+        discovered_schema: Optional[Mapping[str, SchemaType]],
     ) -> Iterable[Dict[str, Any]]:
         avro_format = config.format or AvroFormat()
         if not isinstance(avro_format, AvroFormat):

airbyte-cdk/python/airbyte_cdk/sources/file_based/file_types/file_type_parser.py

@@ -4,13 +4,13 @@
 
 import logging
 from abc import ABC, abstractmethod
-from typing import Any, Dict, Iterable
+from typing import Any, Dict, Iterable, Mapping, Optional
 
 from airbyte_cdk.sources.file_based.config.file_based_stream_config import FileBasedStreamConfig
 from airbyte_cdk.sources.file_based.file_based_stream_reader import AbstractFileBasedStreamReader, FileReadMode
 from airbyte_cdk.sources.file_based.remote_file import RemoteFile
+from airbyte_cdk.sources.file_based.schema_helpers import SchemaType
 
-Schema = Dict[str, str]
 Record = Dict[str, Any]
 
 
@@ -27,7 +27,7 @@ async def infer_schema(
         file: RemoteFile,
         stream_reader: AbstractFileBasedStreamReader,
         logger: logging.Logger,
-    ) -> Schema:
+    ) -> SchemaType:
         """
         Infer the JSON Schema for this file.
         """
@@ -40,6 +40,7 @@ def parse_records(
         file: RemoteFile,
         stream_reader: AbstractFileBasedStreamReader,
         logger: logging.Logger,
+        discovered_schema: Optional[Mapping[str, SchemaType]],
     ) -> Iterable[Record]:
         """
         Parse and emit each record.

airbyte-cdk/python/airbyte_cdk/sources/file_based/file_types/jsonl_parser.py

@@ -4,14 +4,14 @@
 
 import json
 import logging
-from typing import Any, Dict, Iterable
+from typing import Any, Dict, Iterable, Mapping, Optional
 
 from airbyte_cdk.sources.file_based.config.file_based_stream_config import FileBasedStreamConfig
 from airbyte_cdk.sources.file_based.exceptions import FileBasedSourceError, RecordParseError
 from airbyte_cdk.sources.file_based.file_based_stream_reader import AbstractFileBasedStreamReader, FileReadMode
 from airbyte_cdk.sources.file_based.file_types.file_type_parser import FileTypeParser
 from airbyte_cdk.sources.file_based.remote_file import RemoteFile
-from airbyte_cdk.sources.file_based.schema_helpers import PYTHON_TYPE_MAPPING, merge_schemas
+from airbyte_cdk.sources.file_based.schema_helpers import PYTHON_TYPE_MAPPING, SchemaType, merge_schemas
 
 
 class JsonlParser(FileTypeParser):
@@ -25,12 +25,12 @@ async def infer_schema(
         file: RemoteFile,
         stream_reader: AbstractFileBasedStreamReader,
         logger: logging.Logger,
-    ) -> Dict[str, Any]:
+    ) -> SchemaType:
         """
         Infers the schema for the file by inferring the schema for each line, and merging
         it with the previously-inferred schema.
         """
-        inferred_schema: Dict[str, Any] = {}
+        inferred_schema: Mapping[str, Any] = {}
 
         for entry in self._parse_jsonl_entries(file, stream_reader, logger, read_limit=True):
             line_schema = self._infer_schema_for_record(entry)
@@ -44,6 +44,7 @@ def parse_records(
         file: RemoteFile,
         stream_reader: AbstractFileBasedStreamReader,
         logger: logging.Logger,
+        discovered_schema: Optional[Mapping[str, SchemaType]],
     ) -> Iterable[Dict[str, Any]]:
         """
         This code supports parsing json objects over multiple lines even though this does not align with the JSONL format. This is for

airbyte-cdk/python/airbyte_cdk/sources/file_based/file_types/parquet_parser.py

@@ -5,7 +5,7 @@
 import json
 import logging
 import os
-from typing import Any, Dict, Iterable, List, Mapping
+from typing import Any, Dict, Iterable, List, Mapping, Optional
 from urllib.parse import unquote
 
 import pyarrow as pa
@@ -15,6 +15,7 @@
 from airbyte_cdk.sources.file_based.file_based_stream_reader import AbstractFileBasedStreamReader, FileReadMode
 from airbyte_cdk.sources.file_based.file_types.file_type_parser import FileTypeParser
 from airbyte_cdk.sources.file_based.remote_file import RemoteFile
+from airbyte_cdk.sources.file_based.schema_helpers import SchemaType
 from pyarrow import Scalar
 
 
@@ -28,7 +29,7 @@ async def infer_schema(
         file: RemoteFile,
         stream_reader: AbstractFileBasedStreamReader,
         logger: logging.Logger,
-    ) -> Dict[str, Any]:
+    ) -> SchemaType:
         parquet_format = config.format or ParquetFormat()
         if not isinstance(parquet_format, ParquetFormat):
             raise ValueError(f"Expected ParquetFormat, got {parquet_format}")
@@ -51,6 +52,7 @@ def parse_records(
         file: RemoteFile,
         stream_reader: AbstractFileBasedStreamReader,
         logger: logging.Logger,
+        discovered_schema: Optional[Mapping[str, SchemaType]],
     ) -> Iterable[Dict[str, Any]]:
         parquet_format = config.format or ParquetFormat()
         if not isinstance(parquet_format, ParquetFormat):

airbyte-cdk/python/airbyte_cdk/sources/file_based/schema_helpers.py

@@ -11,7 +11,7 @@
 from airbyte_cdk.sources.file_based.exceptions import ConfigValidationError, FileBasedSourceError, SchemaInferenceError
 
 JsonSchemaSupportedType = Union[List[str], Literal["string"], str]
-SchemaType = Dict[str, Dict[str, JsonSchemaSupportedType]]
+SchemaType = Mapping[str, Mapping[str, JsonSchemaSupportedType]]
 
 schemaless_schema = {"type": "object", "properties": {"data": {"type": "object"}}}
 
@@ -99,7 +99,7 @@ def merge_schemas(schema1: SchemaType, schema2: SchemaType) -> SchemaType:
         if not isinstance(t, dict) or "type" not in t or not _is_valid_type(t["type"]):
             raise SchemaInferenceError(FileBasedSourceError.UNRECOGNIZED_TYPE, key=k, type=t)
 
-    merged_schema: Dict[str, Any] = deepcopy(schema1)
+    merged_schema: Dict[str, Any] = deepcopy(schema1)  # type: ignore  # as of 2023-08-08, deepcopy can copy Mapping
     for k2, t2 in schema2.items():
         t1 = merged_schema.get(k2)
         if t1 is None:
@@ -116,7 +116,7 @@ def _is_valid_type(t: JsonSchemaSupportedType) -> bool:
     return t == "array" or get_comparable_type(t) is not None
 
 
-def _choose_wider_type(key: str, t1: Dict[str, Any], t2: Dict[str, Any]) -> Dict[str, Any]:
+def _choose_wider_type(key: str, t1: Mapping[str, Any], t2: Mapping[str, Any]) -> Mapping[str, Any]:
     if (t1["type"] == "array" or t2["type"] == "array") and t1 != t2:
         raise SchemaInferenceError(
             FileBasedSourceError.SCHEMA_INFERENCE_ERROR,

airbyte-cdk/python/airbyte_cdk/sources/file_based/stream/default_file_based_stream.py

@@ -6,7 +6,7 @@
 import itertools
 import traceback
 from functools import cache
-from typing import Any, Dict, Iterable, List, Mapping, MutableMapping, Optional, Set, Union
+from typing import Any, Iterable, List, Mapping, MutableMapping, Optional, Set, Union
 
 from airbyte_cdk.models import AirbyteLogMessage, AirbyteMessage, Level
 from airbyte_cdk.models import Type as MessageType
@@ -20,7 +20,7 @@
     StopSyncPerValidationPolicy,
 )
 from airbyte_cdk.sources.file_based.remote_file import RemoteFile
-from airbyte_cdk.sources.file_based.schema_helpers import merge_schemas, schemaless_schema
+from airbyte_cdk.sources.file_based.schema_helpers import SchemaType, merge_schemas, schemaless_schema
 from airbyte_cdk.sources.file_based.stream import AbstractFileBasedStream
 from airbyte_cdk.sources.file_based.stream.cursor import AbstractFileBasedCursor
 from airbyte_cdk.sources.file_based.types import StreamSlice
@@ -84,7 +84,7 @@ def read_records_from_slice(self, stream_slice: StreamSlice) -> Iterable[Mapping
             n_skipped = line_no = 0
 
             try:
-                for record in parser.parse_records(self.config, file, self._stream_reader, self.logger):
+                for record in parser.parse_records(self.config, file, self._stream_reader, self.logger, schema):
                     line_no += 1
                     if self.config.schemaless:
                         record = {"data": record}
@@ -231,8 +231,8 @@ async def _infer_schema(self, files: List[RemoteFile]) -> Mapping[str, Any]:
         Each file type has a corresponding `infer_schema` handler.
         Dispatch on file type.
         """
-        base_schema: Dict[str, Any] = {}
-        pending_tasks: Set[asyncio.tasks.Task[Dict[str, Any]]] = set()
+        base_schema: SchemaType = {}
+        pending_tasks: Set[asyncio.tasks.Task[SchemaType]] = set()
 
         n_started, n_files = 0, len(files)
         files_iterator = iter(files)
@@ -251,7 +251,7 @@ async def _infer_schema(self, files: List[RemoteFile]) -> Mapping[str, Any]:
 
         return base_schema
 
-    async def _infer_file_schema(self, file: RemoteFile) -> Dict[str, Any]:
+    async def _infer_file_schema(self, file: RemoteFile) -> SchemaType:
         try:
             return await self.get_parser(self.config.file_type).infer_schema(self.config, file, self._stream_reader, self.logger)
         except Exception as exc:

airbyte-cdk/python/unit_tests/sources/file_based/config/test_csv_format.py

@@ -15,7 +15,7 @@
         pytest.param(0, False, None, id="test_no_skip_rows_before_header_and_no_autogenerate_column_names"),
     ]
 )
-def test_csv_format(skip_rows_before_header, autogenerate_column_names, expected_error):
+def test_csv_format_skip_rows_and_autogenerate_column_names(skip_rows_before_header, autogenerate_column_names, expected_error) -> None:
     if expected_error:
         with pytest.raises(expected_error):
             CsvFormat(skip_rows_before_header=skip_rows_before_header, autogenerate_column_names=autogenerate_column_names)