Github user selvaganesang commented on a diff in the pull request: https://github.com/apache/incubator-trafodion/pull/1055#discussion_r110909382 --- Diff: core/sql/executor/ExHdfsScan.cpp --- @@ -1653,7 +1653,7 @@ char * ExHdfsScanTcb::extractAndTransformAsciiSourceToSqlRow(int &err, // for non-varchar, length of zero indicates a null value. // For all datatypes, HIVE_DEFAULT_NULL_STRING('\N') indicates a null value. if (((len == 0) && (tgtAttr && (NOT DFS2REC::isSQLVarChar(tgtAttr->getDatatype())))) || - ((len > 0) && (memcmp(sourceData, HIVE_DEFAULT_NULL_STRING, len) == 0))) + ((len == strlen(HIVE_DEFAULT_NULL_STRING)) && (memcmp(sourceData, HIVE_DEFAULT_NULL_STRING, len) == 0))) --- End diff -- I am not sure if the c++ compiler would optimize this. You could improve this further by getting the strlen only once in the TCB
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