[GitHub] [shardingsphere] kimmking commented on issue #7284: ColumnMetaDataLoader load error and proxy cannot start success

[GitBox <gi...@apache.org>]

kimmking commented on issue #7284:
URL: https://github.com/apache/shardingsphere/issues/7284#issuecomment-688083397


   You are right.
   
   ```
       /**
        * Retrieves a description of the tables available in the given catalog.
        * Only table descriptions matching the catalog, schema, table
        * name and type criteria are returned.  They are ordered by
        * <code>TABLE_TYPE</code>, <code>TABLE_CAT</code>,
        * <code>TABLE_SCHEM</code> and <code>TABLE_NAME</code>.
        * <P>
        * Each table description has the following columns:
        *  <OL>
        *  <LI><B>TABLE_CAT</B> String {@code =>} table catalog (may be <code>null</code>)
        *  <LI><B>TABLE_SCHEM</B> String {@code =>} table schema (may be <code>null</code>)
        *  <LI><B>TABLE_NAME</B> String {@code =>} table name
        *  <LI><B>TABLE_TYPE</B> String {@code =>} table type.  Typical types are "TABLE",
        *                  "VIEW", "SYSTEM TABLE", "GLOBAL TEMPORARY",
        *                  "LOCAL TEMPORARY", "ALIAS", "SYNONYM".
        *  <LI><B>REMARKS</B> String {@code =>} explanatory comment on the table
        *  <LI><B>TYPE_CAT</B> String {@code =>} the types catalog (may be <code>null</code>)
        *  <LI><B>TYPE_SCHEM</B> String {@code =>} the types schema (may be <code>null</code>)
        *  <LI><B>TYPE_NAME</B> String {@code =>} type name (may be <code>null</code>)
        *  <LI><B>SELF_REFERENCING_COL_NAME</B> String {@code =>} name of the designated
        *                  "identifier" column of a typed table (may be <code>null</code>)
        *  <LI><B>REF_GENERATION</B> String {@code =>} specifies how values in
        *                  SELF_REFERENCING_COL_NAME are created. Values are
        *                  "SYSTEM", "USER", "DERIVED". (may be <code>null</code>)
        *  </OL>
        *
        * <P><B>Note:</B> Some databases may not return information for
        * all tables.
        *
        * @param catalog a catalog name; must match the catalog name as it
        *        is stored in the database; "" retrieves those without a catalog;
        *        <code>null</code> means that the catalog name should not be used to narrow
        *        the search
        * @param schemaPattern a schema name pattern; must match the schema name
        *        as it is stored in the database; "" retrieves those without a schema;
        *        <code>null</code> means that the schema name should not be used to narrow
        *        the search
        * @param tableNamePattern a table name pattern; must match the
        *        table name as it is stored in the database
        * @param types a list of table types, which must be from the list of table types
        *         returned from {@link #getTableTypes},to include; <code>null</code> returns
        * all types
        * @return <code>ResultSet</code> - each row is a table description
        * @exception SQLException if a database access error occurs
        * @see #getSearchStringEscape
        */
       ResultSet getTables(String catalog, String schemaPattern,
                           String tableNamePattern, String types[]) throws SQLException;
   ```


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