docs: public void processMaterializedViewWarnings(Database db, HashMap<Table, String> matViewMap) throws VoltCompilerException {
          for (Table table : db.getTables()) {
              for (MaterializedViewInfo mvInfo : table.getViews()) {
                  for (Statement stmt : mvInfo.getFallbackquerystmts()) {
                      // If there is any statement in the fallBackQueryStmts map, then
                      // there must be some min/max columns.
                      // Only check if the plan uses index scan.
                      if (needsWarningForSingleTableView( getPlanNodeTreeFromCatalogStatement(db, stmt))) {
                          // If we are using IS NOT DISTINCT FROM as our equality operator (which is necessary
                          // to get correct answers), then there will often be no index scans in the plan,
                          // since we cannot optimize IS NOT DISTINCT FROM.
                          m_compiler.addWarn(
                                  "No index found to support UPDATE and DELETE on some of the min() / max() columns " +
                                  "in the materialized view " + mvInfo.getTypeName() +
                                  ", and a sequential scan might be issued when current min / max value is updated / deleted.");
                          break;
                      }
                  }
              }
              // If it's a view on join query case, we check if the join can utilize indices.
              // We throw out warning only if no index scan is used in the plan (ENG-10864).
              MaterializedViewHandlerInfo mvHandlerInfo = table.getMvhandlerinfo().get("mvHandlerInfo");
              if (mvHandlerInfo != null) {
                  Statement createQueryStatement = mvHandlerInfo.getCreatequery().get("createQuery");
                  if (needsWarningForJoinQueryView( getPlanNodeTreeFromCatalogStatement(db, createQueryStatement))) {
                      m_compiler.addWarn(
                              "No index found to support some of the join operations required to refresh the materialized view " +
                              table.getTypeName() +
                              ". The refreshing may be slow.");
                  }
              }
          }
      }