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* use fail-fast for full loads as default read mode
* allow programmatic addition of partitions in addition to recoverPartitions from sparkSession.catalog * add custom date formatters
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Bernhard Müller
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Feb 5, 2020
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28 changes: 28 additions & 0 deletions
28
src/main/scala/com/adidas/analytics/algo/core/PartitionHelpers.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| package com.adidas.analytics.algo.core | ||
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| import org.apache.spark.sql.functions.col | ||
| import org.apache.spark.sql.{Column, DataFrame, Dataset, Row} | ||
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| /** | ||
| * This is a trait with generic logic to interact with dataframes on partition level | ||
| */ | ||
| trait PartitionHelpers { | ||
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| protected def getDistinctPartitions(outputDataFrame: DataFrame, targetPartitions: Seq[String]): Dataset[Row] = { | ||
| val targetPartitionsColumns: Seq[Column] = targetPartitions.map(partitionString => col(partitionString)) | ||
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| outputDataFrame.select(targetPartitionsColumns: _*).distinct | ||
| } | ||
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| protected def getParameterValue(row: Row, partitionString: String): String = | ||
| createParameterValue(row.get(row.fieldIndex(partitionString))) | ||
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| protected def createParameterValue(partitionRawValue: Any): String = | ||
| partitionRawValue match { | ||
| case value: java.lang.Short => value.toString | ||
| case value: java.lang.Integer => value.toString | ||
| case value: scala.Predef.String => "'" + value + "'" | ||
| case null => throw new Exception("Partition Value is null. No support for null partitions!") | ||
| case value => throw new Exception("Unsupported partition DataType: " + value.getClass) | ||
| } | ||
| } |
48 changes: 48 additions & 0 deletions
48
src/main/scala/com/adidas/analytics/algo/core/TableStatistics.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| package com.adidas.analytics.algo.core | ||
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| import org.apache.spark.sql._ | ||
| import scala.collection.JavaConversions._ | ||
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| /** | ||
| * This is a generic trait to use in the algorithms where we want | ||
| * to compute statistics on table and partition level | ||
| */ | ||
| trait TableStatistics extends PartitionHelpers { | ||
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| protected def spark: SparkSession | ||
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| /** | ||
| * will add statistics on partition level using HiveQL statements | ||
| */ | ||
| protected def computeStatisticsForTablePartitions(df: DataFrame, | ||
| targetTable: String, | ||
| targetPartitions: Seq[String]): Unit = { | ||
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| val distinctPartitions: DataFrame = getDistinctPartitions(df, targetPartitions) | ||
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| generateComputePartitionStatements(distinctPartitions, targetTable, targetPartitions) | ||
| .collectAsList() | ||
| .foreach((statement: String) => spark.sql(statement)) | ||
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| } | ||
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| /** | ||
| * will add statistics on table level using HiveQL statements | ||
| */ | ||
| protected def computeStatisticsForTable(tableName: Option[String]): Unit = tableName match { | ||
| case Some(table) => spark.sql(s"ANALYZE TABLE ${table} COMPUTE STATISTICS") | ||
| case None => Unit | ||
| } | ||
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| private def generateComputePartitionStatements(df: DataFrame, | ||
| targetTable: String, | ||
| targetPartitions: Seq[String]): Dataset[String] = { | ||
| df.map(partitionValue => { | ||
| val partitionStatementValues: Seq[String] = targetPartitions | ||
| .map(partitionColumn => s"${partitionColumn}=${getParameterValue(partitionValue, partitionColumn)}") | ||
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| s"ANALYZE TABLE ${targetTable} PARTITION(${partitionStatementValues.mkString(",")}) COMPUTE STATISTICS" | ||
| })(Encoders.STRING) | ||
| } | ||
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| } |
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