Ofer Mendelevitch created SPARK-10892: -----------------------------------------
Summary: Join with Data Frame returns wrong results Key: SPARK-10892 URL: https://issues.apache.org/jira/browse/SPARK-10892 Project: Spark Issue Type: Bug Components: SQL Affects Versions: 1.5.0, 1.4.1 Reporter: Ofer Mendelevitch Priority: Critical I'm attaching a simplified reproducible example of the problem: 1. Loading a JSON file from HDFS as a Data Frame 2. Creating 3 data frames: PRCP, TMIN, TMAX 3. Joining the data frames together. Each of those has a column "value" with the same name, so renaming them after the join. 4. The output seems incorrect; the first column has the correct values, but the two other columns seem to have a copy of the values from the first column. Here's the sample code: import org.apache.spark.sql._ val sqlc = new SQLContext(sc) val weather = sqlc.read.format("json").load("data.json") val prcp = weather.filter("metric = 'PRCP'").as("prcp").cache() val tmin = weather.filter("metric = 'TMIN'").as("tmin").cache() val tmax = weather.filter("metric = 'TMAX'").as("tmax").cache() prcp.filter("year=2012 and month=10").show() tmin.filter("year=2012 and month=10").show() tmax.filter("year=2012 and month=10").show() val out = (prcp.join(tmin, "date_str").join(tmax, "date_str") .select(prcp("year"), prcp("month"), prcp("day"), prcp("date_str"), prcp("value").alias("PRCP"), tmin("value").alias("TMIN"), tmax("value").alias("TMAX")) ) out.filter("year=2012 and month=10").show() The output is: +--------+---+------+-----+-----------+-----+----+ |date_str|day|metric|month| station|value|year| +--------+---+------+-----+-----------+-----+----+ |20121001| 1| PRCP| 10|USW00023272| 0|2012| |20121002| 2| PRCP| 10|USW00023272| 0|2012| |20121003| 3| PRCP| 10|USW00023272| 0|2012| |20121004| 4| PRCP| 10|USW00023272| 0|2012| |20121005| 5| PRCP| 10|USW00023272| 0|2012| |20121006| 6| PRCP| 10|USW00023272| 0|2012| |20121007| 7| PRCP| 10|USW00023272| 0|2012| |20121008| 8| PRCP| 10|USW00023272| 0|2012| |20121009| 9| PRCP| 10|USW00023272| 0|2012| |20121010| 10| PRCP| 10|USW00023272| 0|2012| |20121011| 11| PRCP| 10|USW00023272| 3|2012| |20121012| 12| PRCP| 10|USW00023272| 0|2012| |20121013| 13| PRCP| 10|USW00023272| 0|2012| |20121014| 14| PRCP| 10|USW00023272| 0|2012| |20121015| 15| PRCP| 10|USW00023272| 0|2012| |20121016| 16| PRCP| 10|USW00023272| 0|2012| |20121017| 17| PRCP| 10|USW00023272| 0|2012| |20121018| 18| PRCP| 10|USW00023272| 0|2012| |20121019| 19| PRCP| 10|USW00023272| 0|2012| |20121020| 20| PRCP| 10|USW00023272| 0|2012| +--------+---+------+-----+-----------+-----+——+ +--------+---+------+-----+-----------+-----+----+ |date_str|day|metric|month| station|value|year| +--------+---+------+-----+-----------+-----+----+ |20121001| 1| TMIN| 10|USW00023272| 139|2012| |20121002| 2| TMIN| 10|USW00023272| 178|2012| |20121003| 3| TMIN| 10|USW00023272| 144|2012| |20121004| 4| TMIN| 10|USW00023272| 144|2012| |20121005| 5| TMIN| 10|USW00023272| 139|2012| |20121006| 6| TMIN| 10|USW00023272| 128|2012| |20121007| 7| TMIN| 10|USW00023272| 122|2012| |20121008| 8| TMIN| 10|USW00023272| 122|2012| |20121009| 9| TMIN| 10|USW00023272| 139|2012| |20121010| 10| TMIN| 10|USW00023272| 128|2012| |20121011| 11| TMIN| 10|USW00023272| 122|2012| |20121012| 12| TMIN| 10|USW00023272| 117|2012| |20121013| 13| TMIN| 10|USW00023272| 122|2012| |20121014| 14| TMIN| 10|USW00023272| 128|2012| |20121015| 15| TMIN| 10|USW00023272| 128|2012| |20121016| 16| TMIN| 10|USW00023272| 156|2012| |20121017| 17| TMIN| 10|USW00023272| 139|2012| |20121018| 18| TMIN| 10|USW00023272| 161|2012| |20121019| 19| TMIN| 10|USW00023272| 133|2012| |20121020| 20| TMIN| 10|USW00023272| 122|2012| +--------+---+------+-----+-----------+-----+——+ +--------+---+------+-----+-----------+-----+----+ |date_str|day|metric|month| station|value|year| +--------+---+------+-----+-----------+-----+----+ |20121001| 1| TMAX| 10|USW00023272| 322|2012| |20121002| 2| TMAX| 10|USW00023272| 344|2012| |20121003| 3| TMAX| 10|USW00023272| 222|2012| |20121004| 4| TMAX| 10|USW00023272| 189|2012| |20121005| 5| TMAX| 10|USW00023272| 194|2012| |20121006| 6| TMAX| 10|USW00023272| 200|2012| |20121007| 7| TMAX| 10|USW00023272| 167|2012| |20121008| 8| TMAX| 10|USW00023272| 183|2012| |20121009| 9| TMAX| 10|USW00023272| 194|2012| |20121010| 10| TMAX| 10|USW00023272| 183|2012| |20121011| 11| TMAX| 10|USW00023272| 139|2012| |20121012| 12| TMAX| 10|USW00023272| 161|2012| |20121013| 13| TMAX| 10|USW00023272| 211|2012| |20121014| 14| TMAX| 10|USW00023272| 189|2012| |20121015| 15| TMAX| 10|USW00023272| 233|2012| |20121016| 16| TMAX| 10|USW00023272| 211|2012| |20121017| 17| TMAX| 10|USW00023272| 278|2012| |20121018| 18| TMAX| 10|USW00023272| 294|2012| |20121019| 19| TMAX| 10|USW00023272| 194|2012| |20121020| 20| TMAX| 10|USW00023272| 183|2012| +--------+---+------+-----+-----------+-----+——+ And the join output is: +----+-----+---+--------+----+----+----+ |year|month|day|date_str|PRCP|TMIN|TMAX| +----+-----+---+--------+----+----+----+ |2012| 10| 1|20121001| 0| 0| 0| |2012| 10| 2|20121002| 0| 0| 0| |2012| 10| 3|20121003| 0| 0| 0| |2012| 10| 4|20121004| 0| 0| 0| |2012| 10| 5|20121005| 0| 0| 0| |2012| 10| 6|20121006| 0| 0| 0| |2012| 10| 7|20121007| 0| 0| 0| |2012| 10| 8|20121008| 0| 0| 0| |2012| 10| 9|20121009| 0| 0| 0| |2012| 10| 10|20121010| 0| 0| 0| |2012| 10| 11|20121011| 3| 3| 3| |2012| 10| 12|20121012| 0| 0| 0| |2012| 10| 13|20121013| 0| 0| 0| |2012| 10| 14|20121014| 0| 0| 0| |2012| 10| 15|20121015| 0| 0| 0| |2012| 10| 16|20121016| 0| 0| 0| |2012| 10| 17|20121017| 0| 0| 0| |2012| 10| 18|20121018| 0| 0| 0| |2012| 10| 19|20121019| 0| 0| 0| |2012| 10| 20|20121020| 0| 0| 0| +----+-----+---+--------+----+----+——+ Attachment: - data.json file that is read from HDFS -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org