Github user DaveBirdsall commented on a diff in the pull request:
https://github.com/apache/incubator-trafodion/pull/255#discussion_r49254562
--- Diff: core/sql/generator/GenExplain.cpp ---
@@ -660,6 +660,269 @@ FileScan::addSpecificExplainInfo(ExplainTupleMaster
*explainTuple,
return(explainTuple);
}
+static void appendListOfColumns(Queue* listOfColNames,ComTdb *tdb,
NAString& outNAString){
+
+ if (((ComTdbHbaseAccess*)tdb)->sqHbaseTable()){// if trafodion table
+ char buf[1000];
+
+ listOfColNames->position();
+ for (Lng32 j = 0; j < listOfColNames->numEntries(); j++)
+ {
+ char * currPtr = (char*)listOfColNames->getCurr();
+
+ Lng32 currPos = 0;
+ Lng32 jj = 0;
+ short colNameLen = *(short*)currPtr;
+ currPos += sizeof(short);
+ char colFam[100];
+ while (currPtr[currPos] != ':')
+ {
+ colFam[jj] = currPtr[currPos];
+ currPos++;
+ jj++;
+ }
+ colFam[jj] = ':';
+ jj++;
+ currPos++;
+ colFam[jj] = 0;
+ colNameLen -= jj;
+
+ NABoolean withAt = FALSE;
+ char * colName = &currPtr[currPos];
+ if (colName[0] == '@')
+ {
+ colNameLen--;
+ colName++;
+ withAt = TRUE;
+ }
+
+ Int64 v;
+ if (colNameLen == sizeof(char))
+ v = *(char*)colName;
+ else if (colNameLen == sizeof(unsigned short))
+ v = *(UInt16*)colName;
+ else if (colNameLen == sizeof(Lng32))
+ v = *(ULng32*)colName;
+ else
+ v = 0;
+ if (j==0)
+ str_sprintf(buf, "%s%s%Ld",
+ colFam,
+ (withAt ? "@" : ""),
+ v);
+ else
+ str_sprintf(buf, ",%s%s%Ld",
+ colFam,
+ (withAt ? "@" : ""),
+ v);
+
+ outNAString += buf;
+
+ listOfColNames->advance();
+ } // for
+ }// trafodion tables
+ else
+ {// if hbase native tables
+ char buf[1000];
+
+ listOfColNames->position();
+ for (Lng32 j = 0; j < listOfColNames->numEntries(); j++)
+ {
+ char * currPtr = (char*)listOfColNames->getCurr();
+
+ char * colNamePtr = NULL;
+
+ Lng32 currPos = 0;
+ short colNameLen = *(short*)currPtr;
+ currPos += sizeof(short);
+ char colName[500];
+
+ for (Lng32 i = 0; i < colNameLen; i++)
+ {
+ colName[i] = currPtr[currPos];
+ currPos++;
+ }
+
+ colName[colNameLen] = 0;
+
+ colNamePtr = colName;
+
+ if (j==0)
+ str_sprintf(buf, "%s",colNamePtr);
+ else
+ str_sprintf(buf, ",%s",colNamePtr);
+
+
+ outNAString += buf;
+
+ listOfColNames->advance();
+ } // for
+
+ }// hbase native table
+ outNAString +=" ";
+}
+
+static void appendPushedDownExpression(ComTdb *tdb, NAString& outNAString){
+ // in predicate pushdown V2, the hbaseCompareOps list contains a
reverse polish set of operation, were operators are
+ // AND or OR, the rest are operands. this function display the column,
operator and replace any constant with ?. it keeps reverse polish format
+ // this can be improved in the future for better readability.
+ char buf[1000];
+ Queue* reversePolishItems = ((ComTdbHbaseAccess
*)tdb)->listOfHbaseCompareOps();
+ Queue* pushedDownColumns = ((ComTdbHbaseAccess
*)tdb)->listOfHbaseFilterColNames();
+ reversePolishItems->position();
+ pushedDownColumns->position();
+
+ for (Lng32 j = 0; j < reversePolishItems->numEntries(); j++){
+ char * currPtr = (char*)reversePolishItems->getCurr();
+ char buf2[1000];
+ if (strcmp(currPtr,"V2")!=0 && strcmp(currPtr,"AND")!=0 &&
strcmp(currPtr,"OR")!=0){//if an operand (not an operator or V2 marker), get
the column name
--- End diff --
We'll never have a column name of "V2" at this level will we? (That is, V2
is always unambiguous here?)
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