vinodkc commented on code in PR #54237:
URL: https://github.com/apache/spark/pull/54237#discussion_r2789891729
##########
python/docs/source/tutorial/sql/python_data_source.rst:
##########
@@ -309,7 +309,13 @@ This is the same dummy streaming reader that generates 2
rows every batch implem
def read(self, start: dict) -> Tuple[Iterator[Tuple], dict]:
"""
Takes start offset as an input, return an iterator of tuples and
- the start offset of next read.
+ the end offset (start offset for the next read). The end offset
must
+ advance past the start offset when returning data; otherwise Spark
+ raises a validation exception.
+ For example, returning 2 records from start_idx 0 means end should
+ be {"offset": 2} (i.e. start + 2).
+ When there is no data to read, you may return the same offset as
end and
+ start,but you must provide an empty iterator.
Review Comment:
Done
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