getredash/redash

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

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Aperta il 26 lug 2021

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 (1 commento) (0 reazioni) (0 assegnatari)Python (24.845 star) (4236 fork)batch import
Query Runner: Oracleenhancementhelp wanted

Descrizione

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 < 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:

Guida contributor

Tech stack
pythonsql
Dominio
backenddatabase
Tipo issue
bug
DifficoltàQuanto dovrebbe essere impegnativa per un nuovo contributor.
3
Tempo stimatoTempo stimato per completare e verificare uno scope piccolo.
1-3 hours
Stato attivitàQuanto è probabile che la issue sia ancora attiva e reviewable.
stale
ChiarezzaQuanto chiaramente la issue descrive problema, scope e risultato atteso.
clear
Prerequisiti
Basic Python knowledgeFamiliarity with Oracle DB and cx Oracle
Adatta ai principiantiQuanto la issue è adatta a contributor alla prima esperienza.
45
Direzione di ricerca
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.