catalogs/catalog-jdbc-oceanbase/src/main/java/org/apache/gravitino/catalog/oceanbase/operation/OceanBaseTableOperations.java [362:371]:
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  static String deleteIndexDefinition(
      JdbcTable lazyLoadTable, TableChange.DeleteIndex deleteIndex) {
    if (deleteIndex.isIfExists()) {
      if (Arrays.stream(lazyLoadTable.index())
          .anyMatch(index -> index.name().equals(deleteIndex.getName()))) {
        throw new IllegalArgumentException("Index does not exist");
      }
    }
    return "DROP INDEX " + BACK_QUOTE + deleteIndex.getName() + BACK_QUOTE;
  }
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catalogs/catalog-jdbc-mysql/src/main/java/org/apache/gravitino/catalog/mysql/operation/MysqlTableOperations.java [347:356]:
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  static String deleteIndexDefinition(
      JdbcTable lazyLoadTable, TableChange.DeleteIndex deleteIndex) {
    if (deleteIndex.isIfExists()) {
      if (Arrays.stream(lazyLoadTable.index())
          .anyMatch(index -> index.name().equals(deleteIndex.getName()))) {
        throw new IllegalArgumentException("Index does not exist");
      }
    }
    return "DROP INDEX " + BACK_QUOTE + deleteIndex.getName() + BACK_QUOTE;
  }
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