Jungtaek Lim created SPARK-60373:
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Summary: Streaming outer joins underreport removed state rows
Key: SPARK-60373
URL: https://issues.apache.org/jira/browse/SPARK-60373
Project: Spark
Issue Type: Bug
Components: Structured Streaming
Affects Versions: 4.0.4, 4.1.3, 4.2.0, 4.3.0
Reporter: Jungtaek Lim
The bug is an ancient one introduced in Spark 3.2.0.
Structured Streaming outer joins underreport
{{{}StateOperatorProgress.numRowsRemoved{}}}.
State removed while producing unmatched outer-join output is not counted.
Left/right outer joins omit removals from the preserved side; full outer joins
can report zero despite removing state from both sides.
An end-to-end full-outer regression buffers five rows per side, including three
matching pairs. After a checkpoint restart and watermark advancement, all ten
old state rows are removed, while four unmatched rows produce null-extended
output. The metric reports {*}0{*}, but should report {*}10{*}.
The fix counts every removed state row before filtering matched rows from
output. It changes metric accounting only; query results, eviction decisions,
state layout, and checkpoint compatibility remain unchanged.
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