Query with table with CLOB or BLOB fields is not running in Redash. · getredash/redash#5546

2021-07-26T17:03:28.000Z

### Issue Summary Query with table with CLOB or BLOB fields is not running in Redash. ### Steps to Reproduce 1. Query any table with a Clob or Blob column: `Select * from Table;` 2. See error: `Error running query is not json serializable.` ### Technical details: * Redash Version: redash:8.0.2.b37747 * Browser/OS: * How did you install Redash:

(1 评论) (0 反应) (0 负责人)Python (24,845 star) (4,236 fork)batch import

Query Runner: Oracleenhancementhelp wanted

描述

Issue Summary

Query with table with CLOB or BLOB fields is not running in Redash.

Steps to Reproduce

Query any table with a Clob or Blob column: Select * from Table;
See error: Error running query < cx_Oracle.LOB obect at 0x7f3deb5080> is not json serializable.

Technical details:

Redash Version: redash:8.0.2.b37747
Browser/OS:
How did you install Redash:

贡献者指南

技术栈: pythonsql
领域: backenddatabase
议题类型: bug
难度: 3
预计时间: 1-3 hours
活动状态: stale
清晰度: clear
前置要求: Basic Python knowledgeFamiliarity with Oracle DB and cx Oracle
新手友好度: 45
研究方向: The error 'cx Oracle.LOB object is not JSON serializable' indicates that when Redash fetches query results from Oracle, it does not handle CLOB and BLOB fields. Investigate the Oracle data source connector in Redash, likely in files under 'redash/query runner/' or similar. Look for how other data types like strings or numbers are serialized to JSON, and add a handler for cx Oracle.LOB objects, possibly by using the .read() method to extract the content. Check if there are existing tests for Oracle query results.