axel dahl created SPARK-8685: -------------------------------- Summary: dataframe left joins are not working as expected in pyspark Key: SPARK-8685 URL: https://issues.apache.org/jira/browse/SPARK-8685 Project: Spark Issue Type: Bug Components: PySpark, SQL Affects Versions: 1.4.0 Environment: ubuntu 14.04 Reporter: axel dahl
I have the following code: from pyspark import SQLContext d1 = [{'name':'bob', 'country': 'usa', 'age': 1}, {'name':'alice', 'country': 'jpn', 'age': 2}, {'name':'carol', 'country': 'ire', 'age': 3}] d2 = [{'name':'bob', 'country': 'usa', 'colour':'red'}, {'name':'carol', 'country': 'ire', 'colour':'green'}] r1 = sc.parallelize(d1) r2 = sc.parallelize(d2) sqlContext = SQLContext(sc) df1 = sqlContext.createDataFrame(d1) df2 = sqlContext.createDataFrame(d2) df1.join(df2, df1.name == df2.name and df1.country == df2.country, 'left_outer').collect() When I run it I get the following, (notice in the first row, all join keys are take from the right-side and so are blanked out): [Row(age=2, country=None, name=None, colour=None, country=None, name=None), Row(age=1, country=u'usa', name=u'bob', colour=u'red', country=u'usa', name=u'bob'), Row(age=3, country=u'ire', name=u'carol', colour=u'green', country=u'ire', name=u'alice')] I would expect to get (though ideally without duplicate columns): [Row(age=2, country=u'ire', name=u'alice', colour=None, country=None, name=None), Row(age=1, country=u'usa', name=u'bob', colour=u'red', country=u'usa', name=u'bob'), Row(age=3, country=u'ire', name=u'carol', colour=u'green', country=u'ire', name=u'alice')] The workaround for now is this rather clunky piece of code: df2 = sqlContext.createDataFrame(d2).withColumnRenamed('name', 'name2').withColumnRenamed('country', 'country2') df1.join(df2, df1.name == df2.name2 and df1.country == df2.country2, 'left_outer').collect() -- 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