Kris Mok created SPARK-31187:
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Summary: Sort the whole-stage codegen debug output by
codegenStageId
Key: SPARK-31187
URL: https://issues.apache.org/jira/browse/SPARK-31187
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.4.5, 2.4.4, 2.4.3, 2.4.2, 2.4.1, 2.4.0, 3.0.0
Reporter: Kris Mok
Spark SQL's whole-stage codegen (WSCG) supports dumping the generated code to
help with debugging. One way to get the generated code is through
{{df.queryExecution.debug.codegen}}, or SQL {{explain codegen}} statement.
The generated code is currently printed without specific ordering, which can
make debugging a bit annoying. This ticket tracks a minor improvement to sort
the codegen dump by the {{codegenStageId}}, ascending.
After this change, the following query:
{code}
spark.range(10).agg(sum('id)).queryExecution.debug.codegen
{code}
will always dump the generated code in a natural, stable order.
The number of codegen stages within a single SQL query tends to be very small,
most likely < 50, so the overhead of adding the sorting shouldn't be
significant.
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