Github user nonstop-qfchen commented on a diff in the pull request:
https://github.com/apache/incubator-trafodion/pull/255#discussion_r49465774
--- Diff: core/sql/generator/GenExplain.cpp ---
@@ -754,16 +1017,30 @@
HbaseAccess::addSpecificExplainInfo(ExplainTupleMaster *explainTuple,
}
+ // get column retrieved
+ if (((ComTdbHbaseAccess *)tdb)->listOfFetchedColNames()){
+ description += "column_retrieved: ";
+ appendListOfColumns(((ComTdbHbaseAccess
*)tdb)->listOfFetchedColNames(),tdb,description);
+ }
+ // get predicate pushed down in Reverse Polish Notation for the AND / OR
operators.
+ // could transform it standard notation for better readability, but good
enough for now...
+ // could also evaluate the constants instead of hard coded ?, but good
enough for now...
+ if (((ComTdbHbaseAccess *)tdb)->listOfHbaseFilterColNames()){
+ description += "pushed_down_rpn: ";
--- End diff --
"pusheddown_preds_in_RPN" probably is more accurate.
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