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Jacek Laskowski

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1525.89 (22,827th) 		Reputation
48,121 (2,126th)
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Title Δ
How to count rows matching interrelated conditions? 0.00
How to aggregate over array in JSON? 0.00
How to use QuantileDiscretizer across groups in a DataFrame? 0.00
How to save a partitioned parquet file in Spark 2.1? -0.51
How to write Spark Optimization to recalculate DataFrame when array... -0.02
What's the difference between spark-shell and spark-sql? Any pe... 0.00
How to aggregate on one column and take maximum of others in pyspark? -0.03
How to filter by elements in array field in JSON format? -0.03
How to convert RDD of custom Java class objects to a DataFrame with... 0.00
How to save CSV with all fields quoted? +1.99
How to use Structured Streaming to copy parquet files from HDFS to... 0.00
How to define multiple projects on single line (using Scala's p... 0.00
What's the difference between explode function and operator? 0.00
How to unwind array in DataFrame (from JSON)? 0.00
Why does sbt fail with sbt.ResolveException: unresolved dependency... +0.22
How to split multi-value column into separate rows using typed Data... +0.69
Amazon EMR w/ Spark w/ Postgres: "Failed to start database ... +0.45
How to apply UDF to collected Rows? (fails with "java.lang.Cla... -0.51
Why does Spark Streaming not read from Kafka topic? 0.00
Replace groupByKey with reduceByKey in Spark +0.47
Why does Spark job fail while executing multiple Hive scripts using... +0.49
Can DataFrame be accessed from different SparkSessions? +0.50
How to join two parquet datasets? 0.00
How to join two DataFrames and change column for missing values? -1.03
How to control worker transactions with jdbc data source? 0.00
How to join two DataFrames and update missing values? -2.20
How to calculate difference between date column and current date? 0.00
How to add new columns to DataFrame given their names when they are... +0.48
How to write DataFrame (built from RDD inside foreach) to Kafka? 0.00
Why does KafkaUtils.createStream fail with "error: overloaded... 0.00
How to calculate high and low entries per year? 0.00
How to group by gender and join by positions per group? +1.98
Why could SparkSession initialization take longer every iteration i... 0.00
How to specify custom conf file for Spark Standalone's master? +0.49
How to install Spark 2.1.0 on Windows 7 64-bit? +0.47
How to read all records from Kafka (from start to beginning) and th... 0.00
How to unnest array with keys to join on afterwards? 0.00
Why does streaming job fail with NullPointerException when restarte... 0.00
How to map struct in DataFrame to case class? -0.05
How to spark-submit to ZooKeeper-managed Mesos cluster (gives java.... 0.00
How does RDD.aggregate action work (i.e. how to understand the para... +1.85
Is SparkEnv created after the creation of SparkSession in Spark 2? 0.00
How to load CSVs with timestamps in custom format? +1.98
Why saving to parquet file with over 10000 columns lead to JaninoRu... 0.00
How to use a subquery for dbtable option in jdbc data source? +0.01
How long does RDD remain in memory? -0.33
Why does Spark report "error: not found: type Properties"... 0.00
pyspark error when working with window function (Spark 2.1.0 report... 0.00
How to write streaming dataset to Kafka? +2.17
How to spark-submit a Spark Streaming application with spark-stream... 0.00