Ofer Mendelevitch created SPARK-10892:
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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
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