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Login Open An Account. Payments Made Easy Close Languages. DataFrameNaFunctions Methods for handling missing data null values.
DataFrameStatFunctions Methods for statistics functionality. Window For working with window functions. A SparkSession can be used create DataFrame , register DataFrame as tables, execute SQL over tables, cache tables, and read parquet files.
To create a SparkSession, use the following builder pattern:. A class attribute having a Builder to construct SparkSession instances.
Builder for SparkSession. Sets a config option. Enables Hive support, including connectivity to a persistent Hive metastore, support for Hive SerDes, and Hive user-defined functions.
Gets an existing SparkSession or, if there is no existing one, creates a new one based on the options set in this builder. This method first checks whether there is a valid global default SparkSession, and if yes, return that one.
If no valid global default SparkSession exists, the method creates a new SparkSession and assigns the newly created SparkSession as the global default.
In case an existing SparkSession is returned, the config options specified in this builder will be applied to the existing SparkSession.
Interface through which the user may create, drop, alter or query underlying databases, tables, functions, etc. This is the interface through which the user can get and set all Spark and Hadoop configurations that are relevant to Spark SQL.
When getting the value of a config, this defaults to the value set in the underlying SparkContext , if any. Creates a DataFrame from an RDD , a list or a pandas.
When schema is a list of column names, the type of each column will be inferred from data. When schema is None , it will try to infer the schema column names and types from data , which should be an RDD of either Row , namedtuple , or dict.
When schema is pyspark. DataType or a datatype string, it must match the real data, or an exception will be thrown at runtime. If the given schema is not pyspark.
StructType , it will be wrapped into a pyspark. Each record will also be wrapped into a tuple, which can be converted to row later.
If schema inference is needed, samplingRatio is used to determined the ratio of rows used for schema inference. The first row will be used if samplingRatio is None.
DataType or a datatype string or a list of column names, default is None. The data type string format equals to pyspark. We can also use int as a short name for IntegerType.
When Arrow optimization is enabled, strings inside Pandas DataFrame in Python 2 are converted into bytes as they are bytes in Python 2 whereas regular strings are left as strings.
SparkSession if an active session exists for the current thread. Returns a new SparkSession as new session, that has separate SQLConf, registered temporary views and UDFs, but shared SparkContext and table cache.
Create a DataFrame with single pyspark. LongType column named id , containing elements in a range from start to end exclusive with step value step.
Returns a DataFrameReader that can be used to read data in as a DataFrame. Returns a DataStreamReader that can be used to read data streams as a streaming DataFrame.
Returns the underlying SparkContext. Returns a DataFrame representing the result of the given query. Stop the underlying SparkContext.
Returns a StreamingQueryManager that allows managing all the StreamingQuery instances active on this context.
Returns the specified table as a DataFrame. Returns a UDFRegistration for UDF registration. As of Spark 2. However, we are keeping the class here for backward compatibility.
A SQLContext can be used create DataFrame , register DataFrame as tables, execute SQL over tables, cache tables, and read parquet files.
If set, we do not instantiate a new SQLContext in the JVM, instead we make all calls to this object. When schema is None , it will try to infer the schema column names and types from data , which should be an RDD of Row , or namedtuple , or dict.
DataType or a datatype string it must match the real data, or an exception will be thrown at runtime.
Row , tuple , int , boolean , etc. We can also use int as a short name for pyspark. Changed in version 2. DataType or a datatype string after 2.
StructType and each record will also be wrapped into a tuple. The data source is specified by the source and a set of options. If source is not specified, the default data source configured by spark.
Optionally, a schema can be provided as the schema of the returned DataFrame and created external table.
If the key is not set and defaultValue is set, return defaultValue. If the key is not set and defaultValue is not set, return the system default value.
Deprecated in 3. Use SparkSession. Returns a new SQLContext as new session, that has separate SQLConf, registered temporary views and UDFs, but shared SparkContext and table cache.
Registers the given DataFrame as a temporary table in the catalog. Temporary tables exist only during the lifetime of this instance of SQLContext.
An alias for spark. See pyspark. Deprecated in 2. Use spark. Returns a StreamingQueryManager that allows managing all the StreamingQuery StreamingQueries active on this context.
Returns the specified table or view as a DataFrame. Returns a list of names of tables in the database dbName.
Returns a DataFrame containing names of tables in the given database. If dbName is not specified, the current database will be used.
The returned DataFrame has two columns: tableName and isTemporary a column with BooleanType indicating if a table is a temporary one or not.
Configuration for Hive is read from hive-site. It supports running both SQL and HiveQL commands. If set, we do not instantiate a new HiveContext in the JVM, instead we make all calls to this object.
Invalidate and refresh all the cached the metadata of the given table. For performance reasons, Spark SQL or the external data source library it uses might cache certain metadata about a table, such as the location of blocks.
When those change outside of Spark SQL, users should call this function to invalidate the cache. Wrapper for user-defined function registration.
This instance can be accessed by spark. Register a Python function including lambda function or a user-defined function as a SQL function.
The user-defined function can be either row-at-a-time or vectorized. The value can be either a pyspark. DataType object or a DDL-formatted type string.
To register a nondeterministic Python function, users need to first build a nondeterministic user-defined function for the Python function and then register it as a SQL function.
Please see below. The produced object must match the specified type. Spark uses the return type of the given user-defined function as the return type of the registered user-defined function.
In this case, this API works as if register name, f. In addition to a name and the function itself, the return type can be optionally specified.
When the return type is not specified we would infer it via reflection. A DataFrame is equivalent to a relational table in Spark SQL, and can be created using various functions in SparkSession :.
Once created, it can be manipulated using the various domain-specific-language DSL functions defined in: DataFrame , Column. To select a column from the DataFrame , use the apply method:.
Aggregate on the entire DataFrame without groups shorthand for df. Returns a new DataFrame with an alias set.
Calculates the approximate quantiles of numerical columns of a DataFrame. More precisely,. This method implements a variation of the Greenwald-Khanna algorithm with some speed optimizations.
Note that null values will be ignored in numerical columns before calculation. For columns only containing null values, an empty list is returned.
Can be a single column name, or a list of names for multiple columns. For example 0 is the minimum, 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. If the input col is a string, the output is a list of floats.
If the input col is a list or tuple of strings, the output is also a list, but each element in it is a list of floats, i. Returns a checkpointed version of this Dataset.
Checkpointing can be used to truncate the logical plan of this DataFrame , 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. Returns a new DataFrame that has exactly numPartitions partitions.
Similar to coalesce defined on an RDD , this operation results in a narrow dependency, e. If a larger number of partitions is requested, it will stay at the current number of partitions.
To avoid this, you can call repartition. This will add a shuffle step, but means the current upstream partitions will be executed in parallel per whatever the current partitioning is.
Selects column based on the column name specified as a regex and returns it as Column. Returns all the records as a list of Row.
Calculates the correlation of two columns of a DataFrame as a double value. Currently only supports the Pearson Correlation Coefficient. Returns the number of rows in this DataFrame.
Calculate the sample covariance for the given columns, specified by their names, as a double value.
Creates a global temporary view with this DataFrame. The lifetime of this temporary view is tied to this Spark application. Creates or replaces a local temporary view with this DataFrame.
The lifetime of this temporary table is tied to the SparkSession that was used to create this DataFrame. Creates a local temporary view with this DataFrame.
Returns the cartesian product with another 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.
Pairs that have no occurrences will have zero as their counts. Distinct items will make the first item of each row.
Distinct items will make the column names of the DataFrame. Create a multi-dimensional cube for the current DataFrame using the specified columns, so we can run aggregations on them.
This include 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 DataFrame.
Returns a new DataFrame containing the distinct rows in this DataFrame. Returns a new DataFrame that drops the specified column. Return a new DataFrame with duplicate rows removed, optionally only considering certain columns.
For a static batch DataFrame , it just drops duplicate rows. For a streaming DataFrame , 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.
Returns a new DataFrame omitting rows with null values. This overwrites the how parameter. Return a new DataFrame containing rows in this DataFrame but not in another DataFrame while preserving duplicates.
If False , prints only the physical plan. When this is a string without specifying the mode , it works as the mode is specified. Changed in version 3.
Replace null values, alias for na. Value to replace null values with. If the value is a dict, then subset is ignored and value must be a mapping from column name string to replacement value.
The replacement value must be an int, long, float, boolean, or string. Columns specified in subset that do not have matching data type are ignored.
For example, if value is a string, and subset contains a non-string column, then the non-string column is simply ignored. BooleanType or a string of SQL expression.
Returns the first row as a Row. Applies the f function to all Row of this DataFrame. This is a shorthand for df. Applies the f function to each partition of this DataFrame.
This a shorthand for df. Finding frequent items for columns, possibly with false positives. The support must be greater than 1e Groups the DataFrame using the specified columns, so we can run aggregation on them.
See GroupedData for all the available aggregate functions. Each element should be a column name string or an expression Column.
Returns the first n rows. If n is greater than 1, return a list of Row. If n is 1, return a single Row. Specifies some hint on the current DataFrame.
Return a new DataFrame containing rows only in both this DataFrame and another DataFrame. Return a new DataFrame containing rows in both this DataFrame and another DataFrame while preserving duplicates.
This is equivalent to INTERSECT ALL in SQL. Returns True if the collect and take methods can be run locally without any Spark executors. 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. Joins with another DataFrame , using the given join expression.
If on is a string or a list of strings indicating the name of the join column s , the column s must exist on both sides, and this performs an equi-join.
The following performs a full outer join between df1 and df2. Returns a locally checkpointed version of this Dataset. Local checkpoints are stored in the executors using the caching subsystem and therefore they are not reliable.
Maps an iterator of batches in the current DataFrame using a Python native function that takes and outputs a pandas DataFrame, and returns the result as a DataFrame.
The function should take an iterator of pandas. DataFrame s and return another iterator of pandas. DataFrame s. All columns are passed together as an iterator of pandas.
DataFrame s to the function and the returned iterator of pandas. DataFrame s are combined as a DataFrame.
Each pandas. DataFrame size can be controlled by spark. DataFrame s, and outputs an iterator of pandas. Returns a DataFrameNaFunctions for handling missing values.
Returns a new DataFrame sorted by the specified column s. Sort ascending vs. Specify list for multiple sort orders. If a list is specified, length of the list must equal length of the cols.
Sets the storage level to persist the contents of the DataFrame across operations after the first time it is computed.
This can only be used to assign a new storage level if the DataFrame does not have a storage level set yet. Randomly splits this DataFrame with the provided weights.
Returns the content as an pyspark. RDD of Row. Returns a new DataFrame partitioned by the given partitioning expressions. The resulting DataFrame is hash partitioned.
If it is a Column, it will be used as the first partitioning column. If not specified, the default number of partitions is used.
Changed in version 1. Also made numPartitions optional if partitioning columns are specified. The resulting DataFrame is range partitioned.
At least one partition-by expression must be specified. 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.
Returns a new DataFrame replacing a value with another value. Value can have None. When replacing, the new value will be cast to the type of the existing column.
For numeric replacements all values to be replaced should have unique floating point representation.
Value to be replaced. The replacement value must be a bool, int, long, float, string or None. Create a multi-dimensional rollup for the current DataFrame using the specified columns, so we can run aggregation on them.
Returns a sampled subset of this DataFrame. This is not guaranteed to provide exactly the fraction specified of the total count of the given DataFrame.
If a stratum is not specified, we treat its fraction as zero. Returns the schema of this DataFrame as a pyspark. Projects a set of expressions and returns a new DataFrame.
Projects a set of SQL expressions and returns a new DataFrame. This is a variant of select that accepts SQL expressions. Prints the first n rows to the console.
If set to a number greater than one, truncates long strings to length truncate and align cells right. Returns a new DataFrame with each partition sorted by the specified column s.
Returns a DataFrameStatFunctions for statistic functions. Return a new DataFrame containing rows in this DataFrame but not in another DataFrame.
Computes specified statistics for numeric and string columns. Returns the last num rows as a list of Row. Returns the first num rows as a list of Row.
Returns a new DataFrame that with new specified column names. Converts a DataFrame into a RDD of string.
Returns an iterator that contains all of the rows in this DataFrame. The iterator will consume as much memory as the largest partition in this DataFrame.
With prefetch it may consume up to the memory of the 2 largest partitions. Returns the contents of this DataFrame as Pandas pandas. Returns a new DataFrame.
Concise syntax for chaining custom transformations. Return a new DataFrame containing union of rows in this and another DataFrame.
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 distinct.
Returns a new DataFrame containing union of rows in this and another DataFrame. This is different from both UNION ALL and UNION DISTINCT in SQL.
The difference between this function and union is that this function resolves columns by name not by position :. Marks the DataFrame as non-persistent, and remove all blocks for it from memory and disk.
Returns a new DataFrame by adding a column or replacing the existing column that has the same name. The column expression must be an expression over this DataFrame ; attempting to add a column from some other DataFrame will raise an error.
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. Returns a new DataFrame by renaming an existing column. Defines an event time watermark for this DataFrame.
A watermark tracks a point in time before which we assume no more late data is going to arrive. To know when a given time window aggregation can be finalized and thus can be emitted when using output modes that do not allow updates.
The current watermark is computed by looking at the MAX eventTime seen across all of the partitions in the query minus a user specified delayThreshold.
Due to the cost of coordinating this value across partitions, the actual watermark used is only guaranteed to be at least delayThreshold behind the actual event time.
In some cases we may still process records that arrive more than delayThreshold late. Interface for saving the content of the non-streaming DataFrame out into external storage.
Interface for saving the content of the streaming DataFrame out into external storage. A set of methods for aggregations on a DataFrame , created by DataFrame.
Compute aggregates and returns the result as a DataFrame. There is no partial aggregation with group aggregate UDFs, i. Also, all the data of a group will be loaded into memory, so the user should be aware of the potential OOM risk if data is skewed and certain groups are too large to fit in memory.
If exprs is a single dict mapping from string to string, then the key is the column to perform aggregation on, and the value is the aggregate function.
Alternatively, exprs can also be a list of aggregate Column expressions. Built-in aggregation functions and group aggregate pandas UDFs cannot be mixed in a single call to this function.
It is an alias of pyspark. It is preferred to use pyspark. This API will be deprecated in the future releases. Maps each group of the current DataFrame using a pandas udf and returns the result as a DataFrame.
The function should take a pandas. DataFrame and return another pandas. For each group, all columns are passed together as a pandas.
DataFrame to the user-function and the returned pandas. DataFrame are combined as a DataFrame. The schema should be a StructType describing the schema of the returned pandas.
The column labels of the returned pandas. DataFrame must either match the field names in the defined schema if specified as strings, or match the field data types by position if not strings, e.
The length of the returned pandas. DataFrame can be arbitrary. DataFrame , and outputs a pandas. Alternatively, the user can pass a function that takes two arguments.
In this case, the grouping key s will be passed as the first argument and the data will be passed as the second argument.
The grouping key s will be passed as a tuple of numpy data types, e. The data will still be passed in as a pandas.
DataFrame containing all columns from the original Spark DataFrame. This is useful when the user does not want to hardcode grouping key s in the function.
This function requires a full shuffle. All the data of a group will be loaded into memory, so the user should be aware of the potential OOM risk if data is skewed and certain groups are too large to fit in memory.
If returning a new pandas. DataFrame constructed with a dictionary, it is recommended to explicitly index the columns by name to ensure the positions are correct, or alternatively use an OrderedDict.
For example, pd. See CoGroupedData for the operations that can be run. Pivots a column of the current DataFrame and perform 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. Column instances can be created by:.
Returns this column aliased with a new name or names in the case of expressions that return more than one column, such as explode.
Returns a sort expression based on ascending order of the column, and null values return before non-null values.
Returns a sort expression based on ascending order of the column, and null values appear after non-null values. A boolean expression that is evaluated to true if the value of this expression is between the given columns.
Convert the column into type dataType. Contains the other element. Returns a boolean Column based on a string match.
Returns a sort expression based on the descending order of the column, and null values appear before non-null values. Returns a sort expression based on the descending order of the column, and null values appear after non-null values.
String ends with. See the NaN Semantics for details. An expression that gets an item at position ordinal out of a list, or gets an item by key out of a dict.
A boolean expression that is evaluated to true if the value of this expression is contained by the evaluated values of the arguments.
SQL like expression. Returns a boolean Column based on a SQL LIKE match. See rlike for a regex version.
Evaluates a list of conditions and returns one of multiple possible result expressions. If Column. SQL RLIKE expression LIKE with Regex.
Returns a boolean Column based on a regex match. String starts with. Return a Column which is a substring of the column. When path is specified, an external table is created from the data at the given path.
Otherwise a managed table is created. Optionally, a schema can be provided as the schema of the returned DataFrame and created table.
Drops the global temporary view with the given view name in the catalog. If the view has been cached before, then it will also be uncached.
Returns true if this view is dropped successfully, false otherwise. Drops the local temporary view with the given view name in the catalog. Note that, the return type of this method was None in Spark 2.
Note: the order of arguments here is different from that of its JVM counterpart because Python does not support method overloading.
If no database is specified, the current database is used. This includes all temporary functions. Invalidates and refreshes all the cached data and the associated metadata for any DataFrame that contains the given data source path.
A row in DataFrame. The fields in it can be accessed:. Row can be used to create a row object by using named arguments.
It is not allowed to omit a named argument to represent that the value is None or missing. This should be explicitly set to None in this case.
NOTE: As of Spark 3. To enable sorting for Rows compatible with Spark 2. This option is deprecated and will be removed in future versions of Spark.
In this case, a warning will be issued and the Row will fallback to sort the field names automatically. Row also can be used to create another Row like class, then it could be used to create Row objects, such as.
This form can also be used to create rows as tuple values, i. Beware that such Row objects have different equality semantics:. If a row contains duplicate field names, e.
Functionality for working with missing data in DataFrame. Functionality for statistic functions with DataFrame. When ordering is not defined, an unbounded window frame rowFrame, unboundedPreceding, unboundedFollowing is used by default.
When ordering is defined, a growing window frame rangeFrame, unboundedPreceding, currentRow is used by default.