text: --HINT DISTRIBUTE ON RANDOM
  CREATE TABLE concept_class
  (
    concept_class_id           VARCHAR(20) NOT NULL,
    concept_class_name         VARCHAR(255) NOT NULL,
    concept_class_concept_id   INTEGER NOT NULL
  );
  
  COPY concept_class FROM '/opt/CONCEPT_CLASS.csv' WITH DELIMITER E'\t' CSV HEADER QUOTE E'\b' ;
  
  ALTER TABLE concept_class ADD CONSTRAINT xpk_concept_class PRIMARY KEY (concept_class_id);
  
  CREATE UNIQUE INDEX idx_concept_class_class_id  ON concept_class  (concept_class_id ASC);
  CLUSTER concept_class  USING idx_concept_class_class_id ;
  