catalogs/catalog-jdbc-oceanbase/src/main/java/org/apache/gravitino/catalog/oceanbase/operation/OceanBaseTableOperations.java [373:392]:
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  private String updateColumnNullabilityDefinition(
      TableChange.UpdateColumnNullability change, JdbcTable table) {
    validateUpdateColumnNullable(change, table);
    String col = change.fieldName()[0];
    JdbcColumn column = getJdbcColumnFromTable(table, col);
    JdbcColumn updateColumn =
        JdbcColumn.builder()
            .withName(col)
            .withDefaultValue(column.defaultValue())
            .withNullable(change.nullable())
            .withType(column.dataType())
            .withComment(column.comment())
            .withAutoIncrement(column.autoIncrement())
            .build();
    return MODIFY_COLUMN
        + BACK_QUOTE
        + col
        + BACK_QUOTE
        + appendColumnDefinition(updateColumn, new StringBuilder());
  }
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catalogs/catalog-jdbc-mysql/src/main/java/org/apache/gravitino/catalog/mysql/operation/MysqlTableOperations.java [358:377]:
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  private String updateColumnNullabilityDefinition(
      TableChange.UpdateColumnNullability change, JdbcTable table) {
    validateUpdateColumnNullable(change, table);
    String col = change.fieldName()[0];
    JdbcColumn column = getJdbcColumnFromTable(table, col);
    JdbcColumn updateColumn =
        JdbcColumn.builder()
            .withName(col)
            .withDefaultValue(column.defaultValue())
            .withNullable(change.nullable())
            .withType(column.dataType())
            .withComment(column.comment())
            .withAutoIncrement(column.autoIncrement())
            .build();
    return MODIFY_COLUMN
        + BACK_QUOTE
        + col
        + BACK_QUOTE
        + appendColumnDefinition(updateColumn, new StringBuilder());
  }
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