wsjz commented on issue #2729: Doris could not 'show tables' by JDBC URL: https://github.com/apache/incubator-doris/issues/2729#issuecomment-573071387 > I got the exception when attempted to use mysql connector to construct palo catalog for **Presto**. > with palo catalog, I could "show schemas" and "use", but when I performed "show tables", presto printed the exception: > > java.sql.SQLException: 'TABLE' is not a number > at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:965) > at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3933) > at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3869) > at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2524) > at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2675) > at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2465) > at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1912) > at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2020) > at com.mysql.jdbc.DatabaseMetaDataUsingInfoSchema.executeMetadataQuery(DatabaseMetaDataUsingInfoSchema.java:65) > at com.mysql.jdbc.DatabaseMetaDataUsingInfoSchema.getTables(DatabaseMetaDataUsingInfoSchema.java:1190) for the mysql connector in presto，it uses JDBC to connect mysql server，and we should get the table metadata first. but I find JDBC will create the SQL when get table metadata： `SELECT TABLE_SCHEMA AS TABLE_CAT, NULL AS TABLE_SCHEM, TABLE_NAME, CASE WHEN TABLE_TYPE='BASE TABLE' THEN CASE WHEN TABLE_SCHEMA = 'mysql' OR TABLE_SCHEMA = 'performance_schema' THEN 'SYSTEM TABLE' ELSE 'TABLE'END WHEN TABLE_TYPE='TEMPORARY' THEN 'LOCAL_TEMPORARY' ELSE TABLE_TYPE END AS TABLE_TYPE, TABLE_COMMENT AS REMARKS, NULL AS TYPE_CAT, NULL AS TYPE_SCHEM, NULL AS TYPE_NAME, NULL AS SELF_REFERENCING_COL_NAME, NULL AS REF_GENERATION FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA LIKE 'table_name' AND TABLE_NAME LIKE '%' HAVING TABLE_TYPE IN ('TABLE','VIEW',null,null,null) ORDER BY TABLE_TYPE, TABLE_SCHEMA, TABLE_NAME` That's the SQL that causes " 'TABLE' is not a number " as before. But when I take out the NULL from IN predicate，it run successfully!!! That's to say, the NULL is regarded as type "number", so 'TABLE' and 'VIEW' in IN predicate are also "number" rather than "string".
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