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https://issues.apache.org/jira/browse/SPARK-25420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16755709#comment-16755709
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Jeffrey commented on SPARK-25420:
---------------------------------
[~kabhwan] I cannot share the dataset since it is owned by my clients. I could
elaborate more on the scenarios:
>>drkcard_0_df =
>>spark.read.csv("""[wasbs://[email protected]/AAA/WICTW/raw/TXN/POS/2018/09/**/*.gz|wasbs://[email protected]/ASW/WTCTW/raw/TlogParser/PARSED_TLOG/2018/09/**/*.gz]""")
The dataset carries > 100,000 of records.
>>drkcard_0_df.where("_c0='2018-09-21 00:00:00' and _c1='TDT_DSC_ITM' and
>>_c2='83' and _c4='1809192127320082002000018'").show(2000,False)
|_c0|_c1|_c2|_c3|_c4|_c5|
|2018-09-21 00:00:00|TDT_DSC_ITM|83|A|1809192127320082002000018|John|
|2018-09-21 00:00:00|TDT_DSC_ITM|83|A|1809192127320082002000018|Tom|
|2018-09-21 00:00:00|TDT_DSC_ITM|83|B|1809192127320082002000018|Mary|
|2018-09-21 00:00:00|TDT_DSC_ITM|83|B|1809192127320082002000018|Mabel|
|2018-09-21 00:00:00|TDT_DSC_ITM|83|C|1809192127320082002000018|James|
|2018-09-21 00:00:00|TDT_DSC_ITM|83|C|1809192127320082002000018|Laurence|
>>dropDup_0=drkcard_0_df.dropDuplicates(["_c0","_c1","_c2","_c3","_c4"])
Running the where for 1st time: {color:#FF0000}Bug: Group C was mistakenly
dropped.{color}
>>dropDup_0.where("_c0='2018-09-21 00:00:00' and _c1='TDT_DSC_ITM' and _c2='83'
>>and _c4='1809192127320082002000018'").show(2000,False)
|_c0|_c1|_c2|_c3|_c4|_c5|
|2018-09-21 00:00:00|TDT_DSC_ITM|83|A|1809192127320082002000018|John|
|2018-09-21 00:00:00|TDT_DSC_ITM|83|B|1809192127320082002000018|Mary|
Running the where again: {color:#FF0000}Acceptable result{color}
>>dropDup_0.where("_c0='2018-09-21 00:00:00' and _c1='TDT_DSC_ITM' and
_c2='83' and _c4='1809192127320082002000018'").show(2000,False)
|_c0|_c1|_c2|_c3|_c4|_c5|
|2018-09-21 00:00:00|TDT_DSC_ITM|83|A|1809192127320082002000018|John|
|2018-09-21 00:00:00|TDT_DSC_ITM|83|B|1809192127320082002000018|Mabel|
|2018-09-21 00:00:00|TDT_DSC_ITM|83|C|1809192127320082002000018|Laurence|
Running the where again:{color:#FF0000}Bug: Group A and C were mistakenly
dropped.{color}
>>dropDup_0.where("_c0='2018-09-21 00:00:00' and _c1='TDT_DSC_ITM' and
_c2='83' and _c4='1809192127320082002000018'").show(2000,False)
|_c0|_c1|_c2|_c3|_c4|_c5|
|2018-09-21 00:00:00|TDT_DSC_ITM|83|B|1809192127320082002000018|Mabel|
Continue to repeat running the where statement, the number of rows keep
changing.
> Dataset.count() every time is different.
> -----------------------------------------
>
> Key: SPARK-25420
> URL: https://issues.apache.org/jira/browse/SPARK-25420
> Project: Spark
> Issue Type: Question
> Components: Spark Core
> Affects Versions: 2.3.0
> Environment: spark2.3
> standalone
> Reporter: huanghuai
> Priority: Major
> Labels: SQL
>
> Dataset<Row> dataset = sparkSession.read().format("csv").option("sep",
> ",").option("inferSchema", "true")
> .option("escape", Constants.DEFAULT_CSV_ESCAPE).option("header", "true")
> .option("encoding", "UTF-8")
> .load("hdfs://192.168.1.26:9000/data/caopan/07-08_WithHead30M.csv");
> System.out.println("source count="+dataset.count());
> Dataset<Row> dropDuplicates = dataset.dropDuplicates(new
> String[]\{"DATE","TIME","VEL","COMPANY"});
> System.out.println("dropDuplicates count1="+dropDuplicates.count());
> System.out.println("dropDuplicates count2="+dropDuplicates.count());
> Dataset<Row> filter = dropDuplicates.filter("jd > 120.85 and wd > 30.666666
> and (status = 0 or status = 1)");
> System.out.println("filter count1="+filter.count());
> System.out.println("filter count2="+filter.count());
> System.out.println("filter count3="+filter.count());
> System.out.println("filter count4="+filter.count());
> System.out.println("filter count5="+filter.count());
>
>
> ------------------------------------------------------The above is code
> ---------------------------------------
>
>
> console output:
> source count=459275
> dropDuplicates count1=453987
> dropDuplicates count2=453987
> filter count1=445798
> filter count2=445797
> filter count3=445797
> filter count4=445798
> filter count5=445799
>
> question:
>
> Why is filter.count() different everytime?
> if I remove dropDuplicates() everything will be ok!!
>
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