ALTER TABLE IF EXISTS qna_table DROP COLUMN IF EXISTS annotation_attributes_json;
ALTER TABLE IF EXISTS qna_table DROP COLUMN IF EXISTS user_attributes_json;
ALTER TABLE IF EXISTS qna_table DROP COLUMN IF EXISTS end_ts;
ALTER TABLE IF EXISTS qna_table DROP COLUMN IF EXISTS updated_at;
ALTER TABLE IF EXISTS qna_table DROP COLUMN IF EXISTS event_type_id;
ALTER TABLE IF EXISTS qna_table DROP COLUMN IF EXISTS mining_job_id;
ALTER TABLE IF EXISTS qna_table DROP COLUMN IF EXISTS mining_task_id;


