Getting exception oracle.rdb.jdbc.common.RdbException: Invalid column name on user's custom native SQL Queries in EAP 6

Issue

• While migrating from EAP5 to EAP6 user encountered below exception on the custom native SQL Queries:

getEntityManager().createNativeQuery("select SUM (test) from TestDB").getSingleResult();

• We are using native query, we are getting Invalid Column Name at the point is about the function sum()

Caused by: oracle.rdb.jdbc.common.RdbException: Invalid column name 
    at oracle.rdb.jdbc.common.ResultSetMetaData.getColumn(ResultSetMetaData.java:952)
    at oracle.rdb.jdbc.common.ResultSet.findCol(ResultSet.java:4721)
    at oracle.rdb.jdbc.common.ResultSet.getBigDecimal(ResultSet.java:2294)
    at org.hibernate.type.descriptor.sql.DecimalTypeDescriptor$2.doExtract(DecimalTypeDescriptor.java:67)
    at org.hibernate.type.descriptor.sql.BasicExtractor.extract(BasicExtractor.java:64)
    at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:265)
    at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:261)
    at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:256)
    at org.hibernate.loader.custom.CustomLoader$ScalarResultColumnProcessor.extract(CustomLoader.java:590)
    at org.hibernate.loader.custom.CustomLoader$ResultRowProcessor.buildResultRow(CustomLoader.java:537)
    at org.hibernate.loader.custom.CustomLoader$ResultRowProcessor.buildResultRow(CustomLoader.java:516)
    at org.hibernate.loader.custom.CustomLoader.getResultColumnOrRow(CustomLoader.java:413)
    at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:747)
    at org.hibernate.loader.Loader.processResultSet(Loader.java:949)
    at org.hibernate.loader.Loader.doQuery(Loader.java:917)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:348)
    at org.hibernate.loader.Loader.doList(Loader.java:2550)
    at org.hibernate.loader.Loader.doList(Loader.java:2536)
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2366)
    at org.hibernate.loader.Loader.list(Loader.java:2361)
    at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:340)
    at org.hibernate.internal.SessionImpl.listCustomQuery(SessionImpl.java:1788)
    at org.hibernate.internal.AbstractSessionImpl.list(AbstractSessionImpl.java:232)
    at org.hibernate.internal.SQLQueryImpl.list(SQLQueryImpl.java:157)
    at org.hibernate.ejb.QueryImpl.getSingleResult(QueryImpl.java:287)
    .......
10:58:20,770 WARN  [main] [SqlExceptionHelper] SQL Error: 17006, SQLState: S1000