public void setGroupByExprForClause(String clause, ASTNode ast) {
    destToGroupby.put(clause, ast);
  }
Check if a table is in the list to be inserted into
See also {@link #getInsertOverwriteTables()}
@param fullTableName table name in dbname.tablename format
@return
ql/src/java/org/apache/hadoop/hive/ql/parse/QBParseInfo.java