pyspark.pandas.DataFrame.to_delta¶
-
DataFrame.to_delta(path: str, mode: str = 'w', partition_cols: Union[str, List[str], None] = None, index_col: Union[str, List[str], None] = None, **options: OptionalPrimitiveType) → None[source]¶ Write the DataFrame out as a Delta Lake table.
- Parameters
- pathstr, required
Path to write to.
- modestr
Python write mode, default ‘w’.
Note
mode can accept the strings for Spark writing mode. Such as ‘append’, ‘overwrite’, ‘ignore’, ‘error’, ‘errorifexists’.
‘append’ (equivalent to ‘a’): Append the new data to existing data.
‘overwrite’ (equivalent to ‘w’): Overwrite existing data.
‘ignore’: Silently ignore this operation if data already exists.
‘error’ or ‘errorifexists’: Throw an exception if data already exists.
- partition_colsstr or list of str, optional, default None
Names of partitioning columns
- index_col: str or list of str, optional, default: None
Column names to be used in Spark to represent pandas-on-Spark’s index. The index name in pandas-on-Spark is ignored. By default, the index is always lost.
- optionsdict
All other options passed directly into Delta Lake.
Examples
>>> df = ps.DataFrame(dict( ... date=list(pd.date_range('2012-1-1 12:00:00', periods=3, freq='M')), ... country=['KR', 'US', 'JP'], ... code=[1, 2 ,3]), columns=['date', 'country', 'code']) >>> df date country code 0 2012-01-31 12:00:00 KR 1 1 2012-02-29 12:00:00 US 2 2 2012-03-31 12:00:00 JP 3
Create a new Delta Lake table, partitioned by one column:
>>> df.to_delta('%s/to_delta/foo' % path, partition_cols='date')
Partitioned by two columns:
>>> df.to_delta('%s/to_delta/bar' % path, ... partition_cols=['date', 'country'])
Overwrite an existing table’s partitions, using the ‘replaceWhere’ capability in Delta:
>>> df.to_delta('%s/to_delta/bar' % path, ... mode='overwrite', replaceWhere='date >= "2012-01-01"')