MONDRIAN: Fixes an issue with Greenplum where the SQL generated to count the number of members of a level would be invalid if there was more than one column to count.
MONDRIAN: Fixes an issue with Greenplum where the SQL generated to count the number of members of a level would be invalid if there was more than one column to count.

[git-p4: depot-paths = "//open/mondrian/": change = 14668]

julianhyde/mondrian,openedbox/mondrian,pedrofvteixeira/mondrian,cesarmarinhorj/mondrian,cocosli/mondrian,lgrill-pentaho/mondrian,sayanh/mondrian,pentaho/mondrian,rfellows/mondrian,nextelBIS/mondrian,stiberger/mondrian,nextelBIS/mondrian,dkincade/mondrian,AvinashPD/mondrian,cocosli/mondrian,OSBI/mondrian,openedbox/mondrian,citycloud-bigdata/mondrian,truvenganong/mondrian,mustangore/mondrian,cesarmarinhorj/mondrian,wetet2/mondrian,AvinashPD/mondrian,pentaho/mondrian,sayanh/mondrian,openedbox/mondrian,mdamour1976/mondrian,syncron/mondrian,OSBI/mondrian,mustangore/mondrian,bmorrise/mondrian,syncron/mondrian,lgrill-pentaho/mondrian,wetet2/mondrian,bmorrise/mondrian,OSBI/mondrian,stiberger/mondrian,citycloud-bigdata/mondrian,julianhyde/mondrian,bmorrise/mondrian,Seiferxx/mondrian,sayanh/mondrian,dkincade/mondrian,Seiferxx/mondrian,mdamour1976/mondrian,nextelBIS/mondrian,preisanalytics/mondrian,preisanalytics/mondrian,preisanalytics/mondrian,cocosli/mondrian,cesarmarinhorj/mondrian,mustangore/mondrian,truvenganong/mondrian,truvenganong/mondrian,ivanpogodin/mondrian,citycloud-bigdata/mondrian,stiberger/mondrian,Seiferxx/mondrian,pedrofvteixeira/mondrian,wetet2/mondrian,pentaho/mondrian,pedrofvteixeira/mondrian,ivanpogodin/mondrian,dkincade/mondrian,rfellows/mondrian,ivanpogodin/mondrian,syncron/mondrian,AvinashPD/mondrian,mdamour1976/mondrian,lgrill-pentaho/mondrian