snowflake-snowpark-python 1.11.1

Snowflake Snowpark for Python

Snowflake Snowpark Python API

The Snowpark library provides intuitive APIs for querying and processing data in a data pipeline. Using this library, you can build applications that process data in Snowflake without having to move data to the system where your application code runs.

Source code | Developer guide | API reference | Product documentation | Samples

Getting started

Have your Snowflake account ready

If you don't have a Snowflake account yet, you can sign up for a 30-day free trial account.

Create a Python virtual environment

You can use miniconda, anaconda, or virtualenv to create a Python 3.8, 3.9, 3.10 or 3.11 virtual environment.

To have the best experience when using it with UDFs, creating a local conda environment with the Snowflake channel is recommended.

Install the library to the Python virtual environment

pip install snowflake-snowpark-python

Optionally, you need to install pandas in the same environment if you want to use pandas-related features:

pip install "snowflake-snowpark-python[pandas]"

Create a session and use the APIs

from snowflake.snowpark import Session

connection_parameters = {
  "account": "<your snowflake account>",
  "user": "<your snowflake user>",
  "password": "<your snowflake password>",
  "role": "<snowflake user role>",
  "warehouse": "<snowflake warehouse>",
  "database": "<snowflake database>",
  "schema": "<snowflake schema>"
}

session = Session.builder.configs(connection_parameters).create()
df = session.create_dataframe([[1, 2], [3, 4]], schema=["a", "b"])
df = df.filter(df.a > 1)
df.show()
pandas_df = df.to_pandas()  # this requires pandas installed in the Python environment
result = df.collect()

Samples

The Developer Guide and API references have basic sample code. Snowflake-Labs has more curated demos.

Logging

Configure logging level for snowflake.snowpark for Snowpark Python API logs. Snowpark uses the Snowflake Python Connector. So you may also want to configure the logging level for snowflake.connector when the error is in the Python Connector. For instance,

import logging
for logger_name in ('snowflake.snowpark', 'snowflake.connector'):
    logger = logging.getLogger(logger_name)
    logger.setLevel(logging.DEBUG)
    ch = logging.StreamHandler()
    ch.setLevel(logging.DEBUG)
    ch.setFormatter(logging.Formatter('%(asctime)s - %(threadName)s %(filename)s:%(lineno)d - %(funcName)s() - %(levelname)s - %(message)s'))
    logger.addHandler(ch)

Contributing

Please refer to CONTRIBUTING.md.

Release History

1.11.1 (2023-11-07)

Bug Fixes

• Fixed a bug that numpy should not be imported at the top level of mock module.

1.11.0 (2023-11-05)

New Features

• Add the conn_error attribute to SnowflakeSQLException that stores the whole underlying exception from snowflake-connector-python.

• Added support for RelationalGroupedDataframe.pivot() to access pivot in the following pattern Dataframe.group_by(...).pivot(...).

• Added experimental feature: Local Testing Mode, which allows you to create and operate on Snowpark Python DataFrames locally without connecting to a Snowflake account. You can use the local testing framework to test your DataFrame operations locally, on your development machine or in a CI (continuous integration) pipeline, before deploying code changes to your account.

• Added support for arrays_to_object new functions in snowflake.snowpark.functions.

• Added support for the vector data type.

Dependency Updates

• Bumped cloudpickle dependency to work with cloudpickle==2.2.1
• Updated snowflake-connector-python to 3.4.0.

Bug Fixes

• DataFrame column names quoting check now supports newline characters.
• Fix a bug where a DataFrame generated by session.read.with_metadata creates inconsistent table when doing df.write.save_as_table.

1.10.0 (2023-11-03)

New Features

• Added support for managing case sensitivity in DataFrame.to_local_iterator().
• Added support for specifying vectorized UDTF's input column names by using the optional parameter input_names in UDTFRegistration.register/register_file and functions.pandas_udtf. By default, RelationalGroupedDataFrame.applyInPandas will infer the column names from current dataframe schema.
• Add sql_error_code and raw_message attributes to SnowflakeSQLException when it is caused by a SQL exception.

Bug Fixes

• Fixed a bug in DataFrame.to_pandas() where converting snowpark dataframes to pandas dataframes was losing precision on integers with more than 19 digits.
• Fixed a bug that session.add_packages can not handle requirement specifier that contains project name with underscore and version.
• Fixed a bug in DataFrame.limit() when offset is used and the parent DataFrame uses limit. Now the offset won't impact the parent DataFrame's limit.
• Fixed a bug in DataFrame.write.save_as_table where dataframes created from read api could not save data into snowflake because of invalid column name $1.

Behavior change

• Changed the behavior of date_format:
  • The format argument changed from optional to required.
  • The returned result changed from a date object to a date-formatted string.
• When a window function, or a sequence-dependent data generator (normal, zipf, uniform, seq1, seq2, seq4, seq8) function is used, the sort and filter operation will no longer be flattened when generating the query.

1.9.0 (2023-10-13)

New Features

• Added support for the Python 3.11 runtime environment.

Dependency updates

• Added back the dependency of typing-extensions.

Bug Fixes

• Fixed a bug where imports from permanent stage locations were ignored for temporary stored procedures, UDTFs, UDFs, and UDAFs.
• Revert back to using CTAS (create table as select) statement for Dataframe.writer.save_as_table which does not need insert permission for writing tables.

New Features

• Support PythonObjJSONEncoder json-serializable objects for ARRAY and OBJECT literals.

1.8.0 (2023-09-14)

New Features

• Added support for VOLATILE/IMMUTABLE keyword when registering UDFs.

• Added support for specifying clustering keys when saving dataframes using DataFrame.save_as_table.

• Accept Iterable objects input for schema when creating dataframes using Session.create_dataframe.

• Added the property DataFrame.session to return a Session object.

• Added the property Session.session_id to return an integer that represents session ID.

• Added the property Session.connection to return a SnowflakeConnection object .

• Added support for creating a Snowpark session from a configuration file or environment variables.

Dependency updates

• Updated snowflake-connector-python to 3.2.0.

Bug Fixes

• Fixed a bug where automatic package upload would raise ValueError even when compatible package version were added in session.add_packages.
• Fixed a bug where table stored procedures were not registered correctly when using register_from_file.
• Fixed a bug where dataframe joins failed with invalid_identifier error.
• Fixed a bug where DataFrame.copy disables SQL simplfier for the returned copy.
• Fixed a bug where session.sql().select() would fail if any parameters are specified to session.sql()

1.7.0 (2023-08-28)

New Features

• Added parameters external_access_integrations and secrets when creating a UDF, UDTF or Stored Procedure from Snowpark Python to allow integration with external access.
• Added support for these new functions in snowflake.snowpark.functions:
  • array_flatten
  • flatten
• Added support for apply_in_pandas in snowflake.snowpark.relational_grouped_dataframe.
• Added support for replicating your local Python environment on Snowflake via Session.replicate_local_environment.

Bug Fixes

• Fixed a bug where session.create_dataframe fails to properly set nullable columns where nullability was affected by order or data was given.
• Fixed a bug where DataFrame.select could not identify and alias columns in presence of table functions when output columns of table function overlapped with columns in dataframe.

Behavior Changes

• When creating stored procedures, UDFs, UDTFs, UDAFs with parameter is_permanent=False will now create temporary objects even when stage_name is provided. The default value of is_permanent is False which is why if this value is not explicitly set to True for permanent objects, users will notice a change in behavior.
• types.StructField now enquotes column identifier by default.

1.6.1 (2023-08-02)

New Features

• Added support for these new functions in snowflake.snowpark.functions:
  • array_sort
  • sort_array
  • array_min
  • array_max
  • explode_outer
• Added support for pure Python packages specified via Session.add_requirements or Session.add_packages. They are now usable in stored procedures and UDFs even if packages are not present on the Snowflake Anaconda channel.
  • Added Session parameter custom_packages_upload_enabled and custom_packages_force_upload_enabled to enable the support for pure Python packages feature mentioned above. Both parameters default to False.
• Added support for specifying package requirements by passing a Conda environment yaml file to Session.add_requirements.
• Added support for asynchronous execution of multi-query dataframes that contain binding variables.
• Added support for renaming multiple columns in DataFrame.rename.
• Added support for Geometry datatypes.
• Added support for params in session.sql() in stored procedures.
• Added support for user-defined aggregate functions (UDAFs). This feature is currently in private preview.
• Added support for vectorized UDTFs (user-defined table functions). This feature is currently in public preview.
• Added support for Snowflake Timestamp variants (i.e., TIMESTAMP_NTZ, TIMESTAMP_LTZ, TIMESTAMP_TZ)
  • Added TimestampTimezone as an argument in TimestampType constructor.
  • Added type hints NTZ, LTZ, TZ and Timestamp to annotate functions when registering UDFs.

Improvements

• Removed redundant dependency typing-extensions.
• DataFrame.cache_result now creates temp table fully qualified names under current database and current schema.

Bug Fixes

• Fixed a bug where type check happens on pandas before it is imported.
• Fixed a bug when creating a UDF from numpy.ufunc.
• Fixed a bug where DataFrame.union was not generating the correct Selectable.schema_query when SQL simplifier is enabled.

Behavior Changes

• DataFrameWriter.save_as_table now respects the nullable field of the schema provided by the user or the inferred schema based on data from user input.

Dependency updates

• Updated snowflake-connector-python to 3.0.4.

1.5.1 (2023-06-20)

New Features

• Added support for the Python 3.10 runtime environment.

1.5.0 (2023-06-09)

Behavior Changes

• Aggregation results, from functions such as DataFrame.agg and DataFrame.describe, no longer strip away non-printing characters from column names.

New Features

• Added support for the Python 3.9 runtime environment.
• Added support for new functions in snowflake.snowpark.functions:
  • array_generate_range
  • array_unique_agg
  • collect_set
  • sequence
• Added support for registering and calling stored procedures with TABLE return type.
• Added support for parameter length in StringType() to specify the maximum number of characters that can be stored by the column.
• Added the alias functions.element_at() for functions.get().
• Added the alias Column.contains for functions.contains.
• Added experimental feature DataFrame.alias.
• Added support for querying metadata columns from stage when creating DataFrame using DataFrameReader.
• Added support for StructType.add to append more fields to existing StructType objects.
• Added support for parameter execute_as in StoredProcedureRegistration.register_from_file() to specify stored procedure caller rights.

Bug Fixes

• Fixed a bug where the Dataframe.join_table_function did not run all of the necessary queries to set up the join table function when SQL simplifier was enabled.
• Fixed type hint declaration for custom types - ColumnOrName, ColumnOrLiteralStr, ColumnOrSqlExpr, LiteralType and ColumnOrLiteral that were breaking mypy checks.
• Fixed a bug where DataFrameWriter.save_as_table and DataFrame.copy_into_table failed to parse fully qualified table names.

1.4.0 (2023-04-24)

New Features

• Added support for session.getOrCreate.
• Added support for alias Column.getField.
• Added support for new functions in snowflake.snowpark.functions:
  • date_add and date_sub to make add and subtract operations easier.
  • daydiff
  • explode
  • array_distinct.
  • regexp_extract.
  • struct.
  • format_number.
  • bround.
  • substring_index
• Added parameter skip_upload_on_content_match when creating UDFs, UDTFs and stored procedures using register_from_file to skip uploading files to a stage if the same version of the files are already on the stage.
• Added support for DataFrameWriter.save_as_table method to take table names that contain dots.
• Flattened generated SQL when DataFrame.filter() or DataFrame.order_by() is followed by a projection statement (e.g. DataFrame.select(), DataFrame.with_column()).
• Added support for creating dynamic tables (in private preview) using Dataframe.create_or_replace_dynamic_table.
• Added an optional argument params in session.sql() to support binding variables. Note that this is not supported in stored procedures yet.

Bug Fixes

• Fixed a bug in strtok_to_array where an exception was thrown when a delimiter was passed in.
• Fixed a bug in session.add_import where the module had the same namespace as other dependencies.

1.3.0 (2023-03-28)

New Features

• Added support for delimiters parameter in functions.initcap().
• Added support for functions.hash() to accept a variable number of input expressions.
• Added API Session.RuntimeConfig for getting/setting/checking the mutability of any runtime configuration.
• Added support managing case sensitivity in Row results from DataFrame.collect using case_sensitive parameter.
• Added API Session.conf for getting, setting or checking the mutability of any runtime configuration.
• Added support for managing case sensitivity in Row results from DataFrame.collect using case_sensitive parameter.
• Added indexer support for snowflake.snowpark.types.StructType.
• Added a keyword argument log_on_exception to Dataframe.collect and Dataframe.collect_no_wait to optionally disable error logging for SQL exceptions.

Bug Fixes

• Fixed a bug where a DataFrame set operation(DataFrame.substract, DataFrame.union, etc.) being called after another DataFrame set operation and DataFrame.select or DataFrame.with_column throws an exception.
• Fixed a bug where chained sort statements are overwritten by the SQL simplifier.

Improvements

• Simplified JOIN queries to use constant subquery aliases (SNOWPARK_LEFT, SNOWPARK_RIGHT) by default. Users can disable this at runtime with session.conf.set('use_constant_subquery_alias', False) to use randomly generated alias names instead.
• Allowed specifying statement parameters in session.call().
• Enabled the uploading of large pandas DataFrames in stored procedures by defaulting to a chunk size of 100,000 rows.

1.2.0 (2023-03-02)

New Features

• Added support for displaying source code as comments in the generated scripts when registering stored procedures. This is enabled by default, turn off by specifying source_code_display=False at registration.
• Added a parameter if_not_exists when creating a UDF, UDTF or Stored Procedure from Snowpark Python to ignore creating the specified function or procedure if it already exists.
• Accept integers when calling snowflake.snowpark.functions.get to extract value from array.
• Added functions.reverse in functions to open access to Snowflake built-in function reverse.
• Added parameter require_scoped_url in snowflake.snowflake.files.SnowflakeFile.open() (in Private Preview) to replace is_owner_file is marked for deprecation.

Bug Fixes

• Fixed a bug that overwrote paramstyle to qmark when creating a Snowpark session.
• Fixed a bug where df.join(..., how="cross") fails with SnowparkJoinException: (1112): Unsupported using join type 'Cross'.
• Fixed a bug where querying a DataFrame column created from chained function calls used a wrong column name.

1.1.0 (2023-01-26)

New Features:

• Added asc, asc_nulls_first, asc_nulls_last, desc, desc_nulls_first, desc_nulls_last, date_part and unix_timestamp in functions.
• Added the property DataFrame.dtypes to return a list of column name and data type pairs.
• Added the following aliases:
  • functions.expr() for functions.sql_expr().
  • functions.date_format() for functions.to_date().
  • functions.monotonically_increasing_id() for functions.seq8()
  • functions.from_unixtime() for functions.to_timestamp()

Bug Fixes:

• Fixed a bug in SQL simplifier that didn’t handle Column alias and join well in some cases. See https://github.com/snowflakedb/snowpark-python/issues/658 for details.
• Fixed a bug in SQL simplifier that generated wrong column names for function calls, NaN and INF.

Improvements

• The session parameter PYTHON_SNOWPARK_USE_SQL_SIMPLIFIER is True after Snowflake 7.3 was released. In snowpark-python, session.sql_simplifier_enabled reads the value of PYTHON_SNOWPARK_USE_SQL_SIMPLIFIER by default, meaning that the SQL simplfier is enabled by default after the Snowflake 7.3 release. To turn this off, set PYTHON_SNOWPARK_USE_SQL_SIMPLIFIER in Snowflake to False or run session.sql_simplifier_enabled = False from Snowpark. It is recommended to use the SQL simplifier because it helps to generate more concise SQL.

1.0.0 (2022-11-01)

New Features

• Added Session.generator() to create a new DataFrame using the Generator table function.
• Added a parameter secure to the functions that create a secure UDF or UDTF.

0.12.0 (2022-10-14)

New Features

• Added new APIs for async job:
  • Session.create_async_job() to create an AsyncJob instance from a query id.
  • AsyncJob.result() now accepts argument result_type to return the results in different formats.
  • AsyncJob.to_df() returns a DataFrame built from the result of this asynchronous job.
  • AsyncJob.query() returns the SQL text of the executed query.
• DataFrame.agg() and RelationalGroupedDataFrame.agg() now accept variable-length arguments.
• Added parameters lsuffix and rsuffix to DataFram.join() and DataFrame.cross_join() to conveniently rename overlapping columns.
• Added Table.drop_table() so you can drop the temp table after DataFrame.cache_result(). Table is also a context manager so you can use the with statement to drop the cache temp table after use.
• Added Session.use_secondary_roles().
• Added functions first_value() and last_value(). (contributed by @chasleslr)
• Added on as an alias for using_columns and how as an alias for join_type in DataFrame.join().

Bug Fixes

• Fixed a bug in Session.create_dataframe() that raised an error when schema names had special characters.
• Fixed a bug in which options set in Session.read.option() were not passed to DataFrame.copy_into_table() as default values.
• Fixed a bug in which DataFrame.copy_into_table() raises an error when a copy option has single quotes in the value.

0.11.0 (2022-09-28)

Behavior Changes

• Session.add_packages() now raises ValueError when the version of a package cannot be found in Snowflake Anaconda channel. Previously, Session.add_packages() succeeded, and a SnowparkSQLException exception was raised later in the UDF/SP registration step.

New Features:

• Added method FileOperation.get_stream() to support downloading stage files as stream.
• Added support in functions.ntiles() to accept int argument.
• Added the following aliases:
  • functions.call_function() for functions.call_builtin().
  • functions.function() for functions.builtin().
  • DataFrame.order_by() for DataFrame.sort()
  • DataFrame.orderBy() for DataFrame.sort()
• Improved DataFrame.cache_result() to return a more accurate Table class instead of a DataFrame class.
• Added support to allow session as the first argument when calling StoredProcedure.

Improvements

• Improved nested query generation by flattening queries when applicable.
  • This improvement could be enabled by setting Session.sql_simplifier_enabled = True.
  • DataFrame.select(), DataFrame.with_column(), DataFrame.drop() and other select-related APIs have more flattened SQLs.
  • DataFrame.union(), DataFrame.union_all(), DataFrame.except_(), DataFrame.intersect(), DataFrame.union_by_name() have flattened SQLs generated when multiple set operators are chained.
• Improved type annotations for async job APIs.

Bug Fixes

• Fixed a bug in which Table.update(), Table.delete(), Table.merge() try to reference a temp table that does not exist.

0.10.0 (2022-09-16)

New Features:

• Added experimental APIs for evaluating Snowpark dataframes with asynchronous queries:
  • Added keyword argument block to the following action APIs on Snowpark dataframes (which execute queries) to allow asynchronous evaluations:
    • DataFrame.collect(), DataFrame.to_local_iterator(), DataFrame.to_pandas(), DataFrame.to_pandas_batches(), DataFrame.count(), DataFrame.first().
    • DataFrameWriter.save_as_table(), DataFrameWriter.copy_into_location().
    • Table.delete(), Table.update(), Table.merge().
  • Added method DataFrame.collect_nowait() to allow asynchronous evaluations.
  • Added class AsyncJob to retrieve results from asynchronously executed queries and check their status.
• Added support for table_type in Session.write_pandas(). You can now choose from these table_type options: "temporary", "temp", and "transient".
• Added support for using Python structured data (list, tuple and dict) as literal values in Snowpark.
• Added keyword argument execute_as to functions.sproc() and session.sproc.register() to allow registering a stored procedure as a caller or owner.
• Added support for specifying a pre-configured file format when reading files from a stage in Snowflake.

Improvements:

• Added support for displaying details of a Snowpark session.

Bug Fixes:

• Fixed a bug in which DataFrame.copy_into_table() and DataFrameWriter.save_as_table() mistakenly created a new table if the table name is fully qualified, and the table already exists.

Deprecations:

• Deprecated keyword argument create_temp_table in Session.write_pandas().
• Deprecated invoking UDFs using arguments wrapped in a Python list or tuple. You can use variable-length arguments without a list or tuple.

Dependency updates

• Updated snowflake-connector-python to 2.7.12.

0.9.0 (2022-08-30)

New Features:

• Added support for displaying source code as comments in the generated scripts when registering UDFs. This feature is turned on by default. To turn it off, pass the new keyword argument source_code_display as False when calling register() or @udf().
• Added support for calling table functions from DataFrame.select(), DataFrame.with_column() and DataFrame.with_columns() which now take parameters of type table_function.TableFunctionCall for columns.
• Added keyword argument overwrite to session.write_pandas() to allow overwriting contents of a Snowflake table with that of a Pandas DataFrame.
• Added keyword argument column_order to df.write.save_as_table() to specify the matching rules when inserting data into table in append mode.
• Added method FileOperation.put_stream() to upload local files to a stage via file stream.
• Added methods TableFunctionCall.alias() and TableFunctionCall.as_() to allow aliasing the names of columns that come from the output of table function joins.
• Added function get_active_session() in module snowflake.snowpark.context to get the current active Snowpark session.

Bug Fixes:

• Fixed a bug in which batch insert should not raise an error when statement_params is not passed to the function.
• Fixed a bug in which column names should be quoted when session.create_dataframe() is called with dicts and a given schema.
• Fixed a bug in which creation of table should be skipped if the table already exists and is in append mode when calling df.write.save_as_table().
• Fixed a bug in which third-party packages with underscores cannot be added when registering UDFs.

Improvements:

• Improved function function.uniform() to infer the types of inputs max_ and min_ and cast the limits to IntegerType or FloatType correspondingly.

0.8.0 (2022-07-22)

New Features:

• Added keyword only argument statement_params to the following methods to allow for specifying statement level parameters:
  • collect, to_local_iterator, to_pandas, to_pandas_batches, count, copy_into_table, show, create_or_replace_view, create_or_replace_temp_view, first, cache_result and random_split on class snowflake.snowpark.Dateframe.
  • update, delete and merge on class snowflake.snowpark.Table.
  • save_as_table and copy_into_location on class snowflake.snowpark.DataFrameWriter.
  • approx_quantile, statement_params, cov and crosstab on class snowflake.snowpark.DataFrameStatFunctions.
  • register and register_from_file on class snowflake.snowpark.udf.UDFRegistration.
  • register and register_from_file on class snowflake.snowpark.udtf.UDTFRegistration.
  • register and register_from_file on class snowflake.snowpark.stored_procedure.StoredProcedureRegistration.
  • udf, udtf and sproc in snowflake.snowpark.functions.
• Added support for Column as an input argument to session.call().
• Added support for table_type in df.write.save_as_table(). You can now choose from these table_type options: "temporary", "temp", and "transient".

Improvements:

• Added validation of object name in session.use_* methods.
• Updated the query tag in SQL to escape it when it has special characters.
• Added a check to see if Anaconda terms are acknowledged when adding missing packages.

Bug Fixes:

• Fixed the limited length of the string column in session.create_dataframe().
• Fixed a bug in which session.create_dataframe() mistakenly converted 0 and False to None when the input data was only a list.
• Fixed a bug in which calling session.create_dataframe() using a large local dataset sometimes created a temp table twice.
• Aligned the definition of function.trim() with the SQL function definition.
• Fixed an issue where snowpark-python would hang when using the Python system-defined (built-in function) sum vs. the Snowpark function.sum().

Deprecations:

• Deprecated keyword argument create_temp_table in df.write.save_as_table().

0.7.0 (2022-05-25)

New Features:

• Added support for user-defined table functions (UDTFs).
  • Use function snowflake.snowpark.functions.udtf() to register a UDTF, or use it as a decorator to register the UDTF.
    • You can also use Session.udtf.register() to register a UDTF.
  • Use Session.udtf.register_from_file() to register a UDTF from a Python file.
• Updated APIs to query a table function, including both Snowflake built-in table functions and UDTFs.
  • Use function snowflake.snowpark.functions.table_function() to create a callable representing a table function and use it to call the table function in a query.
  • Alternatively, use function snowflake.snowpark.functions.call_table_function() to call a table function.
  • Added support for over clause that specifies partition by and order by when lateral joining a table function.
  • Updated Session.table_function() and DataFrame.join_table_function() to accept TableFunctionCall instances.

Breaking Changes:

• When creating a function with functions.udf() and functions.sproc(), you can now specify an empty list for the imports or packages argument to indicate that no import or package is used for this UDF or stored procedure. Previously, specifying an empty list meant that the function would use session-level imports or packages.
• Improved the __repr__ implementation of data types in types.py. The unused type_name property has been removed.
• Added a Snowpark-specific exception class for SQL errors. This replaces the previous ProgrammingError from the Python connector.

Improvements:

• Added a lock to a UDF or UDTF when it is called for the first time per thread.
• Improved the error message for pickling errors that occurred during UDF creation.
• Included the query ID when logging the failed query.

Bug Fixes:

• Fixed a bug in which non-integral data (such as timestamps) was occasionally converted to integer when calling DataFrame.to_pandas().
• Fixed a bug in which DataFrameReader.parquet() failed to read a parquet file when its column contained spaces.
• Fixed a bug in which DataFrame.copy_into_table() failed when the dataframe is created by reading a file with inferred schemas.

Deprecations

Session.flatten() and DataFrame.flatten().

Dependency Updates:

• Restricted the version of cloudpickle <= 2.0.0.

0.6.0 (2022-04-27)

New Features:

• Added support for vectorized UDFs with the input as a Pandas DataFrame or Pandas Series and the output as a Pandas Series. This improves the performance of UDFs in Snowpark.
• Added support for inferring the schema of a DataFrame by default when it is created by reading a Parquet, Avro, or ORC file in the stage.
• Added functions current_session(), current_statement(), current_user(), current_version(), current_warehouse(), date_from_parts(), date_trunc(), dayname(), dayofmonth(), dayofweek(), dayofyear(), grouping(), grouping_id(), hour(), last_day(), minute(), next_day(), previous_day(), second(), month(), monthname(), quarter(), year(), current_database(), current_role(), current_schema(), current_schemas(), current_region(), current_avaliable_roles(), add_months(), any_value(), bitnot(), bitshiftleft(), bitshiftright(), convert_timezone(), uniform(), strtok_to_array(), sysdate(), time_from_parts(), timestamp_from_parts(), timestamp_ltz_from_parts(), timestamp_ntz_from_parts(), timestamp_tz_from_parts(), weekofyear(), percentile_cont() to snowflake.snowflake.functions.

Breaking Changes:

• Expired deprecations:
  • Removed the following APIs that were deprecated in 0.4.0: DataFrame.groupByGroupingSets(), DataFrame.naturalJoin(), DataFrame.joinTableFunction, DataFrame.withColumns(), Session.getImports(), Session.addImport(), Session.removeImport(), Session.clearImports(), Session.getSessionStage(), Session.getDefaultDatabase(), Session.getDefaultSchema(), Session.getCurrentDatabase(), Session.getCurrentSchema(), Session.getFullyQualifiedCurrentSchema().

Improvements:

• Added support for creating an empty DataFrame with a specific schema using the Session.create_dataframe() method.
• Changed the logging level from INFO to DEBUG for several logs (e.g., the executed query) when evaluating a dataframe.
• Improved the error message when failing to create a UDF due to pickle errors.

Bug Fixes:

• Removed pandas hard dependencies in the Session.create_dataframe() method.

Dependency Updates:

• Added typing-extension as a new dependency with the version >= 4.1.0.

0.5.0 (2022-03-22)

New Features

• Added stored procedures API.
  • Added Session.sproc property and sproc() to snowflake.snowpark.functions, so you can register stored procedures.
  • Added Session.call to call stored procedures by name.
• Added UDFRegistration.register_from_file() to allow registering UDFs from Python source files or zip files directly.
• Added UDFRegistration.describe() to describe a UDF.
• Added DataFrame.random_split() to provide a way to randomly split a dataframe.
• Added functions md5(), sha1(), sha2(), ascii(), initcap(), length(), lower(), lpad(), ltrim(), rpad(), rtrim(), repeat(), soundex(), regexp_count(), replace(), charindex(), collate(), collation(), insert(), left(), right(), endswith() to snowflake.snowpark.functions.
• Allowed call_udf() to accept literal values.
• Provided a distinct keyword in array_agg().

Bug Fixes:

• Fixed an issue that caused DataFrame.to_pandas() to have a string column if Column.cast(IntegerType()) was used.
• Fixed a bug in DataFrame.describe() when there is more than one string column.

0.4.0 (2022-02-15)

New Features

• You can now specify which Anaconda packages to use when defining UDFs.
  • Added add_packages(), get_packages(), clear_packages(), and remove_package(), to class Session.
  • Added add_requirements() to Session so you can use a requirements file to specify which packages this session will use.
  • Added parameter packages to function snowflake.snowpark.functions.udf() and method UserDefinedFunction.register() to indicate UDF-level Anaconda package dependencies when creating a UDF.
  • Added parameter imports to snowflake.snowpark.functions.udf() and UserDefinedFunction.register() to specify UDF-level code imports.
• Added a parameter session to function udf() and UserDefinedFunction.register() so you can specify which session to use to create a UDF if you have multiple sessions.
• Added types Geography and Variant to snowflake.snowpark.types to be used as type hints for Geography and Variant data when defining a UDF.
• Added support for Geography geoJSON data.
• Added Table, a subclass of DataFrame for table operations:
  • Methods update and delete update and delete rows of a table in Snowflake.
  • Method merge merges data from a DataFrame to a Table.
  • Override method DataFrame.sample() with an additional parameter seed, which works on tables but not on view and sub-queries.
• Added DataFrame.to_local_iterator() and DataFrame.to_pandas_batches() to allow getting results from an iterator when the result set returned from the Snowflake database is too large.
• Added DataFrame.cache_result() for caching the operations performed on a DataFrame in a temporary table. Subsequent operations on the original DataFrame have no effect on the cached result DataFrame.
• Added property DataFrame.queries to get SQL queries that will be executed to evaluate the DataFrame.
• Added Session.query_history() as a context manager to track SQL queries executed on a session, including all SQL queries to evaluate DataFrames created from a session. Both query ID and query text are recorded.
• You can now create a Session instance from an existing established snowflake.connector.SnowflakeConnection. Use parameter connection in Session.builder.configs().
• Added use_database(), use_schema(), use_warehouse(), and use_role() to class Session to switch database/schema/warehouse/role after a session is created.
• Added DataFrameWriter.copy_into_table() to unload a DataFrame to stage files.
• Added DataFrame.unpivot().
• Added Column.within_group() for sorting the rows by columns with some aggregation functions.
• Added functions listagg(), mode(), div0(), acos(), asin(), atan(), atan2(), cos(), cosh(), sin(), sinh(), tan(), tanh(), degrees(), radians(), round(), trunc(), and factorial() to snowflake.snowflake.functions.
• Added an optional argument ignore_nulls in function lead() and lag().
• The condition parameter of function when() and iff() now accepts SQL expressions.

Improvements

• All function and method names have been renamed to use the snake case naming style, which is more Pythonic. For convenience, some camel case names are kept as aliases to the snake case APIs. It is recommended to use the snake case APIs.
  • Deprecated these methods on class Session and replaced them with their snake case equivalents: getImports(), addImports(), removeImport(), clearImports(), getSessionStage(), getDefaultSchema(), getDefaultSchema(), getCurrentDatabase(), getFullyQualifiedCurrentSchema().
  • Deprecated these methods on class DataFrame and replaced them with their snake case equivalents: groupingByGroupingSets(), naturalJoin(), withColumns(), joinTableFunction().
• Property DataFrame.columns is now consistent with DataFrame.schema.names and the Snowflake database Identifier Requirements.
• Column.__bool__() now raises a TypeError. This will ban the use of logical operators and, or, not on Column object, for instance col("a") > 1 and col("b") > 2 will raise the TypeError. Use (col("a") > 1) & (col("b") > 2) instead.
• Changed PutResult and GetResult to subclass NamedTuple.
• Fixed a bug which raised an error when the local path or stage location has a space or other special characters.
• Changed DataFrame.describe() so that non-numeric and non-string columns are ignored instead of raising an exception.

Dependency updates

• Updated snowflake-connector-python to 2.7.4.

0.3.0 (2022-01-09)

New Features

• Added Column.isin(), with an alias Column.in_().
• Added Column.try_cast(), which is a special version of cast(). It tries to cast a string expression to other types and returns null if the cast is not possible.
• Added Column.startswith() and Column.substr() to process string columns.
• Column.cast() now also accepts a str value to indicate the cast type in addition to a DataType instance.
• Added DataFrame.describe() to summarize stats of a DataFrame.
• Added DataFrame.explain() to print the query plan of a DataFrame.
• DataFrame.filter() and DataFrame.select_expr() now accepts a sql expression.
• Added a new bool parameter create_temp_table to methods DataFrame.saveAsTable() and Session.write_pandas() to optionally create a temp table.
• Added DataFrame.minus() and DataFrame.subtract() as aliases to DataFrame.except_().
• Added regexp_replace(), concat(), concat_ws(), to_char(), current_timestamp(), current_date(), current_time(), months_between(), cast(), try_cast(), greatest(), least(), and hash() to module snowflake.snowpark.functions.

Bug Fixes

• Fixed an issue where Session.createDataFrame(pandas_df) and Session.write_pandas(pandas_df) raise an exception when the Pandas DataFrame has spaces in the column name.
• DataFrame.copy_into_table() sometimes prints an error level log entry while it actually works. It's fixed now.
• Fixed an API docs issue where some DataFrame APIs are missing from the docs.

Dependency updates

• Update snowflake-connector-python to 2.7.2, which upgrades pyarrow dependency to 6.0.x. Refer to the python connector 2.7.2 release notes for more details.

0.2.0 (2021-12-02)

New Features

• Updated the Session.createDataFrame() method for creating a DataFrame from a Pandas DataFrame.
• Added the Session.write_pandas() method for writing a Pandas DataFrame to a table in Snowflake and getting a Snowpark DataFrame object back.
• Added new classes and methods for calling window functions.
• Added the new functions cume_dist(), to find the cumulative distribution of a value with regard to other values within a window partition, and row_number(), which returns a unique row number for each row within a window partition.
• Added functions for computing statistics for DataFrames in the DataFrameStatFunctions class.
• Added functions for handling missing values in a DataFrame in the DataFrameNaFunctions class.
• Added new methods rollup(), cube(), and pivot() to the DataFrame class.
• Added the GroupingSets class, which you can use with the DataFrame groupByGroupingSets method to perform a SQL GROUP BY GROUPING SETS.
• Added the new FileOperation(session) class that you can use to upload and download files to and from a stage.
• Added the DataFrame.copy_into_table() method for loading data from files in a stage into a table.
• In CASE expressions, the functions when() and otherwise() now accept Python types in addition to Column objects.
• When you register a UDF you can now optionally set the replace parameter to True to overwrite an existing UDF with the same name.

Improvements

• UDFs are now compressed before they are uploaded to the server. This makes them about 10 times smaller, which can help when you are using large ML model files.
• When the size of a UDF is less than 8196 bytes, it will be uploaded as in-line code instead of uploaded to a stage.

Bug Fixes

• Fixed an issue where the statement df.select(when(col("a") == 1, 4).otherwise(col("a"))), [Row(4), Row(2), Row(3)] raised an exception.
• Fixed an issue where df.toPandas() raised an exception when a DataFrame was created from large local data.

0.1.0 (2021-10-26)

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