cloud-fan commented on a change in pull request #31451:
URL: https://github.com/apache/spark/pull/31451#discussion_r605413557
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File path:
sql/catalyst/src/main/java/org/apache/spark/sql/connector/read/PartitionReader.java
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@@ -51,7 +51,8 @@
T get();
/**
- * Returns an array of custom task metrics. By default it returns empty
array.
+ * Returns an array of custom task metrics. By default it returns empty
array. Note that it is
+ * not recommended to put heavy logic in this method as it may affect
reading performance.
Review comment:
That's a good point. For whole stage codegen with limit, we may stop
earlier before consuming the entire iterator.
If we want to do per 100 rows update, we also need to do one more update at
the end of the task.
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