zero-one.geni.core.dataset — org.clojars.behrica/geni 0.0.42-CB.2

add clj

(add cms item)

(add cms item cnt)

Params: (item: Any)

Result: Unit

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/util/sketch/CountMinSketch.html

Timestamp: 2020-10-19T01:56:26.095Z

agg clj

(agg dataframe & args)

Params: (aggExpr: (String, String), aggExprs: (String, String)*)

Result: DataFrame

(Scala-specific) Aggregates on the entire Dataset without groups.

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.739Z

agg-all clj

(agg-all dataframe agg-fn)

Aggregates on all columns of the entire Dataset without groups.

approx-quantile clj

(approx-quantile dataframe col-or-cols probs rel-error)

Params: (col: String, probabilities: Array[Double], relativeError: Double)

Result: Array[Double]

Calculates the approximate quantiles of a numerical column of a DataFrame.

The result of this algorithm has the following deterministic bound: If the DataFrame has N elements and if we request the quantile at probability p up to error err, then the algorithm will return a sample x from the DataFrame so that the exact rank of x is close to (p * N). More precisely,

This method implements a variation of the Greenwald-Khanna algorithm (with some speed optimizations). The algorithm was first present in Space-efficient Online Computation of Quantile Summaries by Greenwald and Khanna.

the name of the numerical column

a list of quantile probabilities Each number must belong to [0, 1]. For example 0 is the minimum, 0.5 is the median, 1 is the maximum.

The relative target precision to achieve (greater than or equal to 0). If set to zero, the exact quantiles are computed, which could be very expensive. Note that values greater than 1 are accepted but give the same result as 1.

the approximate quantiles at the given probabilities

2.0.0

null and NaN values will be removed from the numerical column before calculation. If the dataframe is empty or the column only contains null or NaN, an empty array is returned.

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/DataFrameStatFunctions.html

Timestamp: 2020-10-19T01:56:24.640Z

bit-size clj

(bit-size bloom)

Params: ()

Result: Long

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/util/sketch/BloomFilter.html

Timestamp: 2020-10-19T01:56:25.738Z

bloom-filter clj

(bloom-filter dataframe expr expected-num-items num-bits-or-fpp)

Params: (colName: String, expectedNumItems: Long, fpp: Double)

Result: BloomFilter

Builds a Bloom filter over a specified column.

name of the column over which the filter is built

expected number of items which will be put into the filter.

expected false positive probability of the filter.

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/DataFrameStatFunctions.html

Timestamp: 2020-10-19T01:56:24.647Z

cache clj

(cache dataframe)

Params: ()

Result: Dataset.this.type

Persist this Dataset with the default storage level (MEMORY_AND_DISK).

1.6.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.750Z

checkpoint clj

(checkpoint dataframe)

(checkpoint dataframe eager)

Params: ()

Result: Dataset[T]

Eagerly checkpoint a Dataset and return the new Dataset. Checkpointing can be used to truncate the logical plan of this Dataset, which is especially useful in iterative algorithms where the plan may grow exponentially. It will be saved to files inside the checkpoint directory set with SparkContext#setCheckpointDir.

2.1.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.752Z

col-regex clj

(col-regex dataframe col-name)

Params: (colName: String)

Result: Column

Selects column based on the column name specified as a regex and returns it as Column.

2.3.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.758Z

collect clj

(collect dataframe)

Params: ()

Result: Array[T]

Returns an array that contains all rows in this Dataset.

Running collect requires moving all the data into the application's driver process, and doing so on a very large dataset can crash the driver process with OutOfMemoryError.

For Java API, use collectAsList.

1.6.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.759Z

collect-col clj

(collect-col dataframe col-name)

Returns a vector that contains all rows in the column of the Dataset.

collect-vals clj

(collect-vals dataframe)

Returns the vector values of the Dataset collected.

column-names clj

(column-names dataframe)

Returns all column names as an array of strings.

columns clj

(columns dataframe)

Returns all column names as an array of keywords.

compatible? clj

(compatible? bloom other)

Params: (other: BloomFilter)

Result: Boolean

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/util/sketch/BloomFilter.html

Timestamp: 2020-10-19T01:56:25.740Z

confidence clj

(confidence cms)

Params: ()

Result: Double

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/util/sketch/CountMinSketch.html

Timestamp: 2020-10-19T01:56:26.102Z

count-min-sketch clj

(count-min-sketch dataframe expr eps-or-depth confidence-or-width seed)

Params: (colName: String, depth: Int, width: Int, seed: Int)

Result: CountMinSketch

Builds a Count-min Sketch over a specified column.

name of the column over which the sketch is built

depth of the sketch

width of the sketch

random seed

a CountMinSketch over column colName

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/DataFrameStatFunctions.html

Timestamp: 2020-10-19T01:56:24.659Z

cov clj

(cov dataframe col-name1 col-name2)

Params: (col1: String, col2: String)

Result: Double

Calculate the sample covariance of two numerical columns of a DataFrame.

the name of the first column

the name of the second column

the covariance of the two columns.

1.4.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/DataFrameStatFunctions.html

Timestamp: 2020-10-19T01:56:24.661Z

cross-join clj

(cross-join left right)

Params: (right: Dataset[_])

Result: DataFrame

Explicit cartesian join with another DataFrame.

Right side of the join operation.

2.1.0

Cartesian joins are very expensive without an extra filter that can be pushed down.

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.770Z

crosstab clj

(crosstab dataframe col-name1 col-name2)

Params: (col1: String, col2: String)

Result: DataFrame

Computes a pair-wise frequency table of the given columns. Also known as a contingency table. The number of distinct values for each column should be less than 1e4. At most 1e6 non-zero pair frequencies will be returned. The first column of each row will be the distinct values of col1 and the column names will be the distinct values of col2. The name of the first column will be col1_col2. Counts will be returned as Longs. Pairs that have no occurrences will have zero as their counts. Null elements will be replaced by "null", and back ticks will be dropped from elements if they exist.

The name of the first column. Distinct items will make the first item of each row.

The name of the second column. Distinct items will make the column names of the DataFrame.

A DataFrame containing for the contingency table.

1.4.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/DataFrameStatFunctions.html

Timestamp: 2020-10-19T01:56:24.664Z

cube clj

(cube dataframe & exprs)

Params: (cols: Column*)

Result: RelationalGroupedDataset

Create a multi-dimensional cube for the current Dataset using the specified columns, so we can run aggregation on them. See RelationalGroupedDataset for all the available aggregate functions.

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.778Z

depth clj

(depth cms)

Params: ()

Result: Int

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/util/sketch/CountMinSketch.html

Timestamp: 2020-10-19T01:56:26.103Z

describe clj

(describe dataframe & col-names)

Params: (cols: String*)

Result: DataFrame

Computes basic statistics for numeric and string columns, including count, mean, stddev, min, and max. If no columns are given, this function computes statistics for all numerical or string columns.

This function is meant for exploratory data analysis, as we make no guarantee about the backward compatibility of the schema of the resulting Dataset. If you want to programmatically compute summary statistics, use the agg function instead.

Use summary for expanded statistics and control over which statistics to compute.

Columns to compute statistics on.

1.6.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.780Z

distinct clj

(distinct dataframe)

Params: ()

Result: Dataset[T]

Returns a new Dataset that contains only the unique rows from this Dataset. This is an alias for dropDuplicates.

2.0.0

Equality checking is performed directly on the encoded representation of the data and thus is not affected by a custom equals function defined on T.

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.781Z

drop clj

(drop dataframe & col-names)

Params: (colName: String)

Result: DataFrame

Returns a new Dataset with a column dropped. This is a no-op if schema doesn't contain column name.

This method can only be used to drop top level columns. the colName string is treated literally without further interpretation.

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.785Z

drop-duplicates clj

(drop-duplicates dataframe & col-names)

Params: ()

Result: Dataset[T]

Returns a new Dataset that contains only the unique rows from this Dataset. This is an alias for distinct.

For a static batch Dataset, it just drops duplicate rows. For a streaming Dataset, it will keep all data across triggers as intermediate state to drop duplicates rows. You can use withWatermark to limit how late the duplicate data can be and system will accordingly limit the state. In addition, too late data older than watermark will be dropped to avoid any possibility of duplicates.

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.791Z

drop-na clj

(drop-na dataframe)

(drop-na dataframe min-non-nulls-or-cols)

(drop-na dataframe min-non-nulls cols)

Params: ()

Result: DataFrame

Returns a new DataFrame that drops rows containing any null or NaN values.

1.3.1

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/DataFrameNaFunctions.html

Timestamp: 2020-10-19T01:56:23.886Z

dtypes clj

(dtypes dataframe)

Params:

Result: Array[(String, String)]

Returns all column names and their data types as an array.

1.6.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.792Z

empty? clj

(empty? dataframe)

Params:

Result: Boolean

Returns true if the Dataset is empty.

2.4.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.840Z

estimate-count clj

(estimate-count cms item)

Params: (item: Any)

Result: Long

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/util/sketch/CountMinSketch.html

Timestamp: 2020-10-19T01:56:26.104Z

except clj

(except dataframe other)

Params: (other: Dataset[T])

Result: Dataset[T]

Returns a new Dataset containing rows in this Dataset but not in another Dataset. This is equivalent to EXCEPT DISTINCT in SQL.

2.0.0

Equality checking is performed directly on the encoded representation of the data and thus is not affected by a custom equals function defined on T.

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.796Z

except-all clj

(except-all dataframe other)

Params: (other: Dataset[T])

Result: Dataset[T]

Returns a new Dataset containing rows in this Dataset but not in another Dataset while preserving the duplicates. This is equivalent to EXCEPT ALL in SQL.

2.4.0

Equality checking is performed directly on the encoded representation of the data and thus is not affected by a custom equals function defined on T. Also as standard in SQL, this function resolves columns by position (not by name).

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.798Z

expected-fpp clj

(expected-fpp bloom)

Params: ()

Result: Double

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/util/sketch/BloomFilter.html

Timestamp: 2020-10-19T01:56:25.739Z

fill-na clj

(fill-na dataframe value)

(fill-na dataframe value cols)

Params: (value: Long)

Result: DataFrame

Returns a new DataFrame that replaces null or NaN values in numeric columns with value.

2.2.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/DataFrameNaFunctions.html

Timestamp: 2020-10-19T01:56:23.908Z

first-vals clj

(first-vals dataframe)

Returns the vector values of the first row in the Dataset collected.

freq-items clj

(freq-items dataframe col-names)

(freq-items dataframe col-names support)

Params: (cols: Array[String], support: Double)

Result: DataFrame

Finding frequent items for columns, possibly with false positives. Using the frequent element count algorithm described in here, proposed by Karp, Schenker, and Papadimitriou. The support should be greater than 1e-4.

This function is meant for exploratory data analysis, as we make no guarantee about the backward compatibility of the schema of the resulting DataFrame.

the names of the columns to search frequent items in.

The minimum frequency for an item to be considered frequent. Should be greater than 1e-4.

A Local DataFrame with the Array of frequent items for each column.

1.4.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/DataFrameStatFunctions.html

Timestamp: 2020-10-19T01:56:24.676Z

group-by clj

(group-by dataframe & exprs)

Params: (cols: Column*)

Result: RelationalGroupedDataset

Groups the Dataset using the specified columns, so we can run aggregation on them. See RelationalGroupedDataset for all the available aggregate functions.

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.827Z

head clj

(head dataframe)

(head dataframe n-rows)

Params: (n: Int)

Result: Array[T]

Returns the first n rows.

1.6.0

this method should only be used if the resulting array is expected to be small, as all the data is loaded into the driver's memory.

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.834Z

head-vals clj

(head-vals dataframe)

(head-vals dataframe n-rows)

Returns the vector values of the first n rows in the Dataset collected.

hint clj

(hint dataframe hint-name & args)

Params: (name: String, parameters: Any*)

Result: Dataset[T]

Specifies some hint on the current Dataset. As an example, the following code specifies that one of the plan can be broadcasted:

2.2.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.835Z

input-files clj

(input-files dataframe)

Params:

Result: Array[String]

Returns a best-effort snapshot of the files that compose this Dataset. This method simply asks each constituent BaseRelation for its respective files and takes the union of all results. Depending on the source relations, this may not find all input files. Duplicates are removed.

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.837Z

intersect clj

(intersect dataframe other)

Params: (other: Dataset[T])

Result: Dataset[T]

Returns a new Dataset containing rows only in both this Dataset and another Dataset. This is equivalent to INTERSECT in SQL.

1.6.0

Equality checking is performed directly on the encoded representation of the data and thus is not affected by a custom equals function defined on T.

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.838Z

intersect-all clj

(intersect-all dataframe other)

Params: (other: Dataset[T])

Result: Dataset[T]

Returns a new Dataset containing rows only in both this Dataset and another Dataset while preserving the duplicates. This is equivalent to INTERSECT ALL in SQL.

2.4.0

Equality checking is performed directly on the encoded representation of the data and thus is not affected by a custom equals function defined on T. Also as standard in SQL, this function resolves columns by position (not by name).

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.839Z

is-compatible clj

(is-compatible bloom other)

Params: (other: BloomFilter)

Result: Boolean

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/util/sketch/BloomFilter.html

Timestamp: 2020-10-19T01:56:25.740Z

is-empty clj

(is-empty dataframe)

Params:

Result: Boolean

Returns true if the Dataset is empty.

2.4.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.840Z

is-local clj

(is-local dataframe)

Params:

Result: Boolean

Returns true if the collect and take methods can be run locally (without any Spark executors).

1.6.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.843Z

is-streaming clj

(is-streaming dataframe)

Params:

Result: Boolean

Returns true if this Dataset contains one or more sources that continuously return data as it arrives. A Dataset that reads data from a streaming source must be executed as a StreamingQuery using the start() method in DataStreamWriter. Methods that return a single answer, e.g. count() or collect(), will throw an AnalysisException when there is a streaming source present.

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.844Z

join clj

(join left right expr)

(join left right expr join-type)

Params: (right: Dataset[_])

Result: DataFrame

Join with another DataFrame.

Behaves as an INNER JOIN and requires a subsequent join predicate.

Right side of the join operation.

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.856Z

join-with clj

(join-with left right condition)

(join-with left right condition join-type)

Params: (other: Dataset[U], condition: Column, joinType: String)

Result: Dataset[(T, U)]

Joins this Dataset returning a Tuple2 for each pair where condition evaluates to true.

This is similar to the relation join function with one important difference in the result schema. Since joinWith preserves objects present on either side of the join, the result schema is similarly nested into a tuple under the column names _1 and _2.

This type of join can be useful both for preserving type-safety with the original object types as well as working with relational data where either side of the join has column names in common.

Right side of the join.

Join expression.

Type of join to perform. Default inner. Must be one of: inner, cross, outer, full, fullouter,full_outer, left, leftouter, left_outer, right, rightouter, right_outer.

1.6.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.860Z

last-vals clj

(last-vals dataframe)

Returns the vector values of the last row in the Dataset collected.

limit clj

(limit dataframe n-rows)

Params: (n: Int)

Result: Dataset[T]

Returns a new Dataset by taking the first n rows. The difference between this function and head is that head is an action and returns an array (by triggering query execution) while limit returns a new Dataset.

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.861Z

local? clj

(local? dataframe)

Params:

Result: Boolean

Returns true if the collect and take methods can be run locally (without any Spark executors).

1.6.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.843Z

merge-in-place clj

(merge-in-place bloom-or-cms other)

Params: (other: BloomFilter)

Result: BloomFilter

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/util/sketch/BloomFilter.html

Timestamp: 2020-10-19T01:56:25.741Z

might-contain clj

(might-contain bloom item)

Params: (item: Any)

Result: Boolean

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/util/sketch/BloomFilter.html

Timestamp: 2020-10-19T01:56:25.742Z

order-by clj

(order-by dataframe & exprs)

Params: (sortCol: String, sortCols: String*)

Result: Dataset[T]

Returns a new Dataset sorted by the given expressions. This is an alias of the sort function.

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.884Z

partitions clj

(partitions dataframe)

Params:

Result: List[Partition]

Set of partitions in this RDD.

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/api/java/JavaRDD.html

Timestamp: 2020-10-19T01:56:48.891Z

persist clj

(persist dataframe)

(persist dataframe new-level)

Params: ()

Result: Dataset.this.type

Persist this Dataset with the default storage level (MEMORY_AND_DISK).

1.6.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.886Z

pivot clj

(pivot grouped expr)

(pivot grouped expr values)

Params: (pivotColumn: String)

Result: RelationalGroupedDataset

Pivots a column of the current DataFrame and performs the specified aggregation.

There are two versions of pivot function: one that requires the caller to specify the list of distinct values to pivot on, and one that does not. The latter is more concise but less efficient, because Spark needs to first compute the list of distinct values internally.

Name of the column to pivot.

1.6.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/RelationalGroupedDataset.html

Timestamp: 2020-10-19T01:56:23.317Z

print-schema clj

(print-schema dataframe)

Params: ()

Result: Unit

Prints the schema to the console in a nice tree format.

1.6.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.888Z

put clj

(put bloom item)

Params: (item: Any)

Result: Boolean

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/util/sketch/BloomFilter.html

Timestamp: 2020-10-19T01:56:25.746Z

random-split clj

(random-split dataframe weights)

(random-split dataframe weights seed)

Params: (weights: Array[Double], seed: Long)

Result: Array[Dataset[T]]

Randomly splits this Dataset with the provided weights.

weights for splits, will be normalized if they don't sum to 1.

Seed for sampling. For Java API, use randomSplitAsList.

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.892Z

rdd clj

(rdd dataframe)

Params:

Result: RDD[T]

Represents the content of the Dataset as an RDD of T.

1.6.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.894Z

relative-error clj

(relative-error cms)

Params: ()

Result: Double

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/util/sketch/CountMinSketch.html

Timestamp: 2020-10-19T01:56:26.106Z

rename-columns clj

(rename-columns dataframe rename-map)

Returns a new Dataset with a column renamed according to the rename-map.

repartition clj

(repartition dataframe & args)

Params: (numPartitions: Int)

Result: Dataset[T]

Returns a new Dataset that has exactly numPartitions partitions.

1.6.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.901Z

repartition-by-range clj

(repartition-by-range dataframe & args)

Params: (numPartitions: Int, partitionExprs: Column*)

Result: Dataset[T]

Returns a new Dataset partitioned by the given partitioning expressions into numPartitions. The resulting Dataset is range partitioned.

At least one partition-by expression must be specified. When no explicit sort order is specified, "ascending nulls first" is assumed. Note, the rows are not sorted in each partition of the resulting Dataset.

Note that due to performance reasons this method uses sampling to estimate the ranges. Hence, the output may not be consistent, since sampling can return different values. The sample size can be controlled by the config spark.sql.execution.rangeExchange.sampleSizePerPartition.

2.3.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.904Z

replace-na clj

(replace-na dataframe cols replacement)

Params: (col: String, replacement: Map[T, T])

Result: DataFrame

Replaces values matching keys in replacement map with the corresponding values.

name of the column to apply the value replacement. If col is "*", replacement is applied on all string, numeric or boolean columns.

value replacement map. Key and value of replacement map must have the same type, and can only be doubles, strings or booleans. The map value can have nulls.

1.3.1

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/DataFrameNaFunctions.html

Timestamp: 2020-10-19T01:56:23.927Z

rollup clj

(rollup dataframe & exprs)

Params: (cols: Column*)

Result: RelationalGroupedDataset

Create a multi-dimensional rollup for the current Dataset using the specified columns, so we can run aggregation on them. See RelationalGroupedDataset for all the available aggregate functions.

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.907Z

sample clj

(sample dataframe fraction)

(sample dataframe fraction with-replacement)

Params: (fraction: Double, seed: Long)

Result: Dataset[T]

Returns a new Dataset by sampling a fraction of rows (without replacement), using a user-supplied seed.

Fraction of rows to generate, range [0.0, 1.0].

Seed for sampling.

2.3.0

This is NOT guaranteed to provide exactly the fraction of the count of the given Dataset.

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.913Z

sample-by clj

(sample-by dataframe expr fractions seed)

Params: (col: String, fractions: Map[T, Double], seed: Long)

Result: DataFrame

Returns a stratified sample without replacement based on the fraction given on each stratum.

stratum type

column that defines strata

sampling fraction for each stratum. If a stratum is not specified, we treat its fraction as zero.

random seed

a new DataFrame that represents the stratified sample

1.5.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/DataFrameStatFunctions.html

Timestamp: 2020-10-19T01:56:24.694Z

select clj

(select dataframe & exprs)

Params: (cols: Column*)

Result: DataFrame

Selects a set of column based expressions.

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.931Z

select-expr clj

(select-expr dataframe & exprs)

Params: (exprs: String*)

Result: DataFrame

Selects a set of SQL expressions. This is a variant of select that accepts SQL expressions.

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.933Z

show clj

(show dataframe)

(show dataframe options)

Params: (numRows: Int)

Result: Unit

Displays the Dataset in a tabular form. Strings more than 20 characters will be truncated, and all cells will be aligned right. For example:

Number of rows to show

1.6.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.945Z

show-vertical clj

(show-vertical dataframe)

(show-vertical dataframe options)

Displays the Dataset in a list-of-records form.

sort clj

(sort dataframe & exprs)

Params: (sortCol: String, sortCols: String*)

Result: Dataset[T]

Returns a new Dataset sorted by the given expressions. This is an alias of the sort function.

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.884Z

sort-within-partitions clj

(sort-within-partitions dataframe & exprs)

Params: (sortCol: String, sortCols: String*)

Result: Dataset[T]

Returns a new Dataset with each partition sorted by the given expressions.

This is the same operation as "SORT BY" in SQL (Hive QL).

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.950Z

spark-session clj

(spark-session dataframe)

Params:

Result: SparkSession

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.951Z

sql-context clj

(sql-context dataframe)

Params:

Result: SQLContext

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.952Z

storage-level clj

(storage-level dataframe)

Params:

Result: StorageLevel

Get the Dataset's current storage level, or StorageLevel.NONE if not persisted.

2.1.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.954Z

streaming? clj

(streaming? dataframe)

Params:

Result: Boolean

Returns true if this Dataset contains one or more sources that continuously return data as it arrives. A Dataset that reads data from a streaming source must be executed as a StreamingQuery using the start() method in DataStreamWriter. Methods that return a single answer, e.g. count() or collect(), will throw an AnalysisException when there is a streaming source present.

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.844Z

summary clj

(summary dataframe & stat-names)

Params: (statistics: String*)

Result: DataFrame

Computes specified statistics for numeric and string columns. Available statistics are:

If no statistics are given, this function computes count, mean, stddev, min, approximate quartiles (percentiles at 25%, 50%, and 75%), and max.

This function is meant for exploratory data analysis, as we make no guarantee about the backward compatibility of the schema of the resulting Dataset. If you want to programmatically compute summary statistics, use the agg function instead.

To do a summary for specific columns first select them:

See also describe for basic statistics.

Statistics from above list to be computed.

2.3.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.957Z

tail clj

(tail dataframe n-rows)

Params: (n: Int)

Result: Array[T]

Returns the last n rows in the Dataset.

Running tail requires moving data into the application's driver process, and doing so with a very large n can crash the driver process with OutOfMemoryError.

3.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.959Z

tail-vals clj

(tail-vals dataframe n-rows)

Returns the vector values of the last n rows in the Dataset collected.

take clj

(take dataframe n-rows)

Params: (n: Int)

Result: Array[T]

Returns the first n rows in the Dataset.

Running take requires moving data into the application's driver process, and doing so with a very large n can crash the driver process with OutOfMemoryError.

1.6.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.961Z

take-vals clj

(take-vals dataframe n-rows)

Returns the vector values of the first n rows in the Dataset collected.

to-byte-array clj

(to-byte-array cms)

Params: ()

Result: Array[Byte]

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/util/sketch/CountMinSketch.html

Timestamp: 2020-10-19T01:56:26.107Z

total-count clj

(total-count cms)

Params: ()

Result: Long

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/util/sketch/CountMinSketch.html

Timestamp: 2020-10-19T01:56:26.108Z

union clj

(union & dataframes)

Params: (other: Dataset[T])

Result: Dataset[T]

Returns a new Dataset containing union of rows in this Dataset and another Dataset.

This is equivalent to UNION ALL in SQL. To do a SQL-style set union (that does deduplication of elements), use this function followed by a distinct.

Also as standard in SQL, this function resolves columns by position (not by name):

Notice that the column positions in the schema aren't necessarily matched with the fields in the strongly typed objects in a Dataset. This function resolves columns by their positions in the schema, not the fields in the strongly typed objects. Use unionByName to resolve columns by field name in the typed objects.

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.974Z

union-by-name clj

(union-by-name & dataframes)

Params: (other: Dataset[T])

Result: Dataset[T]

Returns a new Dataset containing union of rows in this Dataset and another Dataset.

This is different from both UNION ALL and UNION DISTINCT in SQL. To do a SQL-style set union (that does deduplication of elements), use this function followed by a distinct.

The difference between this function and union is that this function resolves columns by name (not by position):

2.3.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.978Z

unpersist clj

(unpersist dataframe)

(unpersist dataframe blocking)

Params: (blocking: Boolean)

Result: Dataset.this.type

Mark the Dataset as non-persistent, and remove all blocks for it from memory and disk. This will not un-persist any cached data that is built upon this Dataset.

Whether to block until all blocks are deleted.

1.6.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.980Z

width clj

(width cms)

Params: ()

Result: Int

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/util/sketch/CountMinSketch.html

Timestamp: 2020-10-19T01:56:26.108Z

with-column clj

(with-column dataframe col-name expr)

Params: (colName: String, col: Column)

Result: DataFrame

Returns a new Dataset by adding a column or replacing the existing column that has the same name.

column's expression must only refer to attributes supplied by this Dataset. It is an error to add a column that refers to some other Dataset.

2.0.0

this method introduces a projection internally. Therefore, calling it multiple times, for instance, via loops in order to add multiple columns can generate big plans which can cause performance issues and even StackOverflowException. To avoid this, use select with the multiple columns at once.

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.987Z

with-column-renamed clj

(with-column-renamed dataframe old-name new-name)

Params: (existingName: String, newName: String)

Result: DataFrame

Returns a new Dataset with a column renamed. This is a no-op if schema doesn't contain existingName.

2.0.0

Source: https://spark.apache.org/docs/3.0.1/api/scala/org/apache/spark/sql/Dataset.html

Timestamp: 2020-10-19T01:56:20.988Z