fix(cdk): fix SubstreamPartitionRouter updating cursor value when no records were read in partition#889
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…re read in partition
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📝 WalkthroughWalkthroughChanged SubstreamPartitionRouter to add Changes
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airbyte_cdk/sources/declarative/partition_routers/substream_partition_router.py (1)
42-49:⚠️ Potential issue | 🔴 CriticalType annotation mismatch causing pipeline failure.
The pipeline is flagging a type error here. Yielding
(None, True)producestuple[None, bool], but the return type expectstuple[T, bool]. Since the sentinel introducesNoneas a possible value, would updating the return type toOptional[T]work for you, wdyt?🔧 Proposed fix
-def iterate_with_last_flag(generator: Iterable[T]) -> Iterable[tuple[T, bool]]: +def iterate_with_last_flag(generator: Iterable[T]) -> Iterable[tuple[Optional[T], bool]]:
🤖 Fix all issues with AI agents
In
`@airbyte_cdk/sources/declarative/partition_routers/substream_partition_router.py`:
- Around line 210-211: In stream_slices() in substream_partition_router.py the
check "if partition is None: return" prematurely exits the entire method when a
parent_stream.generate_partitions() yields the (None, True) sentinel; change
this to "break" (or otherwise exit the inner partition loop) so we stop
iterating that parent stream's partitions and continue to the next
parent_stream_config instead of returning from stream_slices(), leaving the rest
of the parent streams to be processed; locate the partition handling inside the
loop that consumes parent_stream.generate_partitions() and replace the return
with a break (or equivalent loop-control) so behavior matches the original
semantics.
airbyte_cdk/sources/declarative/partition_routers/substream_partition_router.py
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…titionRouter null handling Co-Authored-By: Daryna Ishchenko <darina.ishchenko17@gmail.com>
…ulti-parent behavior Co-Authored-By: Daryna Ishchenko <darina.ishchenko17@gmail.com>
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⚠️ Outside diff range comments (2)
airbyte_cdk/sources/declarative/partition_routers/substream_partition_router.py (2)
42-49:⚠️ Potential issue | 🟠 MajorFix mypy type mismatch in
iterate_with_last_flag.
Line 48 yields(None, True), but the signature advertisestuple[T, bool], which is tripping mypy. Could we widen the return type toOptional[T]to match the sentinel, wdyt?🔧 Proposed fix
-def iterate_with_last_flag(generator: Iterable[T]) -> Iterable[tuple[T, bool]]: +def iterate_with_last_flag(generator: Iterable[T]) -> Iterable[tuple[Optional[T], bool]]:
186-187:⚠️ Potential issue | 🟡 MinorUpdate docstring to match empty-slice behavior.
Lines 186–187 still say an empty parent slice emitsparent_record=None, but the code now skips emission. Could we adjust the docstring to reflect the new behavior, wdyt?📝 Suggested doc tweak
- If a parent slice contains no record, emit a slice with parent_record=None. + If a parent slice contains no record, emit no slice.
Daryna Ishchenko (darynaishchenko)
requested review from
Brian Lai (brianjlai) and
Anatolii Yatsuk (tolik0)
unit_tests/sources/declarative/partition_routers/test_substream_partition_router.py
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… when no records Co-Authored-By: Daryna Ishchenko <darina.ishchenko17@gmail.com>
… empty generators Co-Authored-By: Daryna Ishchenko <darina.ishchenko17@gmail.com>
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Actionable comments posted: 1
🤖 Fix all issues with AI agents
In
`@airbyte_cdk/sources/declarative/partition_routers/substream_partition_router.py`:
- Around line 231-267: The try/except around dpath.get in
substream_partition_router should not use an early `continue` because that skips
the later partition closure logic; instead, introduce a boolean like `skip_slice
= True` when KeyError occurs (and only set `skip_slice = False` when extraction
succeeds), keep `extracted_extra_fields` in a safe default state, and let
execution fall through so the existing `if is_last_record_in_slice:
parent_stream.cursor.close_partition(partition)` / `if is_last_slice:
parent_stream.cursor.ensure_at_least_one_state_emitted()` blocks always run;
finally, guard the `yield StreamSlice(...)` (the emission that uses
`parent_record`, `partition_value`, `extracted_extra_fields`,
`parent_partition`, etc.) so it only occurs when `skip_slice` is False. This
ensures partition closure always executes while still skipping emission for
failed extractions.
airbyte_cdk/sources/declarative/partition_routers/substream_partition_router.py
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…_update_with_cursor Co-Authored-By: Daryna Ishchenko <darina.ishchenko17@gmail.com>
…Error - Replace 'continue' with 'skip_slice' flag when dpath.get fails with KeyError - This ensures close_partition() and ensure_at_least_one_state_emitted() are always called, even when partition value extraction fails - Add test for partition closure when parent_key is missing from record Co-Authored-By: Daryna Ishchenko <darina.ishchenko17@gmail.com>
- Renamed skip_slice to emit_slice and inverted the logic - Now emit_slice=False by default, set to True when extraction succeeds - Makes the code more intuitive: we emit slices when conditions are met Co-Authored-By: Daryna Ishchenko <darina.ishchenko17@gmail.com>
… exists, False on KeyError - emit_slice = parent_record is not None (default True when we have a record) - Set emit_slice = False only when KeyError occurs during dpath.get - This makes the logic clearer: we want to emit slices by default, skip only on error Co-Authored-By: Daryna Ishchenko <darina.ishchenko17@gmail.com>
Daryna Ishchenko (darynaishchenko)
deleted the
daryna/fix-substream-partition-router
branch
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Summary
This PR fixes an issue where
SubstreamPartitionRouterwould incorrectly update cursor values when no records were read in a partition. The fix adds defensive null-checking throughoutstream_slices()to gracefully handle:iterate_with_last_flagnow yields(None, True)sentinel when the input generator is empty, andstream_slices()breaks out of the partition loop when partition is None (preserving multi-parent behavior)if parent_record is not None)skip_sliceflag instead ofcontinueto ensureclose_partition()andensure_at_least_one_state_emitted()are always called, even whendpath.getfailsUpdates since last revision
if partition is None: returntoif partition is None: breakper review feedback. Usingbreakensures that if one parent stream has no partitions, we continue processing subsequentparent_stream_configsrather than exiting the entire method.test_substream_partition_router_closes_all_partitions_even_when_no_recordsto verify thatcursor.close_partition()is called for ALL partitions, including those with no records.iterate_with_last_flagreturn type fromtuple[T, bool]totuple[T | None, bool]to properly reflect that the function yields(None, True)as a sentinel for empty generators.test_substream_slicer_parent_state_update_with_cursorto include properlookback_window: 1andstatevalues.skip_sliceflag pattern per CodeRabbit review feedback. Replacedcontinuewith a flag-based approach whendpath.getraisesKeyError, ensuring partition closure always runs even when slice emission is skipped. Addedtest_substream_partition_router_closes_partition_even_when_parent_key_missingto verify this behavior.Review & Testing Checklist for Human
skip_sliceflag ensuresclose_partition()is called even whenparent_keyextraction fails with KeyError. Confirm this doesn't introduce regressions in normal slice emission.if partition is None: breakexits only the current parent's partition loop. Test with a connector that has multipleparent_stream_configswhere one parent has no partitions to confirm subsequent parents are still processed.SubstreamPartitionRouterwhere parent records are missing the expectedparent_keyfield.poetry run pytest unit_tests/sources/declarative/partition_routers/test_substream_partition_router.py -vNotes
Summary by CodeRabbit
New Features
Bug Fixes
Tests