@Override
  public boolean addAllIndexMappings(Collection<RegionEntry> c) throws IMQException {
    for (RegionEntry regionEntry : c) {
      addMapping(regionEntry);
    }
    // if no exception, then success
    return true;
  }
Get the canonicalized fromClause for this index.
geode-core/src/main/java/org/apache/geode/cache/query/internal/index/AbstractIndex.java