我有这样的查询: SELECT jobs.*, ( CASE WHEN lead_informations.state IS NOT NULL THEN lead_informations.state ELSE 'NEW' END ) AS lead_state FROM jobs LEFT JOIN lead_informations ON lead_informations.job_id = jobs.id AND lead_informations.mechanic_id = 3 WHERE lead_state = 'NEW' 出现以下错误: PGError: ERROR: column "lead_state" does not exist LINE 1: ...s.id AND lead_informations.mechanic_id = 3 …