DROP TABLE IF EXISTS src;
DROP TABLE IF EXISTS dst; 
DROP TABLE IF EXISTS diff; 
CREATE EXTERNAL TABLE src(key STRING, etag STRING, size BIGINT, mtime STRING) ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t' LINES TERMINATED BY '\n' LOCATION '${SRC}';
CREATE EXTERNAL TABLE dst(key STRING, etag STRING, size BIGINT, mtime STRING) ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t' LINES TERMINATED BY '\n' LOCATION '${DST}';
CREATE EXTERNAL TABLE diff(key STRING, etag STRING, size BIGINT, mtime STRING) ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t' LINES TERMINATED BY '\n' LOCATION '${DIFF}';
INSERT OVERWRITE TABLE diff SELECT src.key,src.etag,src.size,src.mtime FROM src LEFT OUTER JOIN dst ON (src.key = dst.key) WHERE (dst.key IS NULL) OR (src.etag != dst.etag);