Github user selvaganesang commented on a diff in the pull request:
https://github.com/apache/incubator-trafodion/pull/1206#discussion_r133314557
--- Diff: core/sql/sqlcomp/nadefaults.cpp ---
@@ -1759,6 +1763,7 @@ SDDkwd__(EXE_DIAGNOSTIC_EVENTS, "OFF"),
// exposure.
DDkwd__(HBASE_DELETE_COSTING, "ON"),
DDflt0_(HBASE_DOP_PARALLEL_SCANNER, "0."),
+ DDkwd__(HBASE_ESTIMATE_ROW_COUNT_VIA_COPROCESSOR, "OFF"),
--- End diff --
I like the co-processor approach because it encapsulates the HFile to
region server code and enables SQL to use well defined and externalized APIs
of HBase. From this perspective, it should be good to remove the old estimate
code entirely even with small performance penalty. This would help to maintain
the code better with future releases of hbase
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