public void importName(String qualifiedName, String asName) {
    if (asName == null) {
      // if no AS, then use the short name from qualifiedName as the AS
      int idx = qualifiedName.lastIndexOf('.');
      if (idx >= 0) {
        asName = qualifiedName.substring(idx + 1);
      } else {
        asName = qualifiedName;
      }
    }
    if (logger.isTraceEnabled()) {
      logger.trace("QCompiler.importName: {},{}", asName, qualifiedName);
    }
    imports.put(asName, qualifiedName);
  }
@return null if null is on the stack
geode-core/src/main/java/org/apache/geode/cache/query/internal/QCompiler.java