chaoqin-li1123 commented on code in PR #45977: URL: https://github.com/apache/spark/pull/45977#discussion_r1583649763
########## python/pyspark/sql/datasource.py: ########## @@ -469,6 +501,188 @@ def stop(self) -> None: ... +class SimpleInputPartition(InputPartition): + def __init__(self, start: dict, end: dict): + self.start = start + self.end = end + + +class SimpleDataSourceStreamReader(ABC): + """ + A base class for simplified streaming data source readers. Compared to DataSourceStreamReader, + SimpleDataSourceStreamReader doesn't require planning data partitioning. Also, the read api of + SimpleDataSourceStreamReader allows reading data and planning the latest offset at the same time. + + .. versionadded: 4.0.0 + """ + + def initialOffset(self) -> dict: + """ + Return the initial offset of the streaming data source. + A new streaming query starts reading data from the initial offset. + If Spark is restarting an existing query, it will restart from the check-pointed offset + rather than the initial one. + + Returns + ------- + dict + A dict or recursive dict whose key and value are primitive types, which includes + Integer, String and Boolean. + + Examples + -------- + >>> def initialOffset(self): + ... return {"parititon-1": {"index": 3, "closed": True}, "partition-2": {"index": 5}} + """ + raise PySparkNotImplementedError( + error_class="NOT_IMPLEMENTED", + message_parameters={"feature": "initialOffset"}, + ) + + def read(self, start: dict) -> (Iterator[Tuple], dict): + """ + Read all available data from specified start offset and return the offset that next read attempt + starts from. + + Parameters + ---------- + start : dict + The start offset to start reading from. + + Returns + ------- + A tuple of an iterator of :class:`Tuple` and a dict\\s + The iterator contains all the available records after start offset. + The dict is the end of this read attempt and the start of next read attempt. + """ + raise PySparkNotImplementedError( + error_class="NOT_IMPLEMENTED", + message_parameters={"feature": "read"}, + ) + + def read2(self, start: dict, end: dict) -> Iterator[Tuple]: Review Comment: Then we won't be able to enforce that read with end offset is implemented. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org