chenboat commented on a change in pull request #4989: Add documentation to
fields of important query execution stats.
URL: https://github.com/apache/incubator-pinot/pull/4989#discussion_r370781673
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File path:
pinot-core/src/main/java/org/apache/pinot/core/operator/ExecutionStatistics.java
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@@ -22,8 +22,13 @@
* The <code>ExecutionStatistics</code> class contains the operator statistics
during execution time.
*/
public class ExecutionStatistics {
+ // The number of documents scanned post filtering.
private long _numDocsScanned;
+ // The number of entries (single value entry contains 1 entry, multi-value
entry may contain multiple entries) in the
+ // filtering phase of the query execution: could be larger than the total
scanned doc num because of multiple
+ // filtering predicates and multi-value entry.
Review comment:
I thought one reason why number_of_entries_scanned > number_of_doc_scanned
is that for a multi-value entry, each value in it could count as one entry
scanned. Is it right?
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